NAKASAKO Noboru
Department of Computational Systems Biology | Professor |
■Researcher basic information
J-Global ID
Research Keyword
- システム工学 情報通信工学 計測工学 System Engineering Information and Communication Engineering Electric Measurements and Control Engineering
Research Field
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Measurement engineering
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Control and systems engineering
- Informatics / Statistical science
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Communication and network engineering
■Career
Career
- 1994 - 2002 Kindai UniversityFaculty of Biology-Oriented Science and Technology電子システム情報工学科
- 1990 - 1994 Hiroshima Institute of TechnologyDepartment of Electrical Engineeringlecturer
- 1992 - 1993 Faculty of Eng., Kinki Univ., Lecturer
- 1986 - 1990 Hiroshima Institute of Technology,Department of Electrical EngineeringResearch Assistant
- 1984 - 1985 Faculty of Eng., Kinki Univ., Lecturer
- Kinki Univ., Associate Professor
- Assistant Professor
- Research Assistant
Educational Background
■Research activity information
Award
Paper
- Noboru Nakasako; Itsuki Yamakado; Toshihiro Shinohara; Tetsuji UeboICIC Express Letters, Part B: Applications 13 (9) 897 - 905 2185-2766 2022/09 [Refereed]
Acoustic distance measurement (ADM) has been proposed as an accurate method by which to measure distances. The ADM method is based on the phase interference between the transmitted and reflected signals. However, the presence of ambient noise degrades the ranging performance. In previous studies, the noise component has been reduced by using three microphones in a noisy environment and applying independent component analysis or generating two difference signals from three observed data. The present paper describes a new, more compact, and practical method by which to reduce the ambient noise and perform ranging using only two adjacent microphones. Specifi-cally, the noise component is reduced by generating a difference signal between the two observations in a noisy environment. Then, the distance is estimated by applying the cross-spectrum method with the difference signal as the input and one of the observed signals as the output. Furthermore, the influence of noise is reduced by applying mask processing to the obtained result. The effectiveness of the proposed method was confirmed in a real room for a signal-to-noise ratio (SNR) of −10 dB. The results showed that the SNR for the difference signal was improved and the estimated distance agreed well with the true value, indicating the effectiveness of the proposed method. - Itsuki Yamakado; Toshihiro Shinohara; Tetsuji Uebo; Noboru NakasakoIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan (IEE Japan) 142 (7) 752 - 758 0385-4221 2022/07 [Refereed]
The acoustic distance measurement (ADM) method based on phase interference between transmitted and reflected signal has been proposed as a method to accurately measure the distance. However, since its performance is deteriorated by ambient noise. In the previous study, complex ICA(Independent Component Analysis) was applied using adjacent 3ch microphone to reduce the noise. Although ICA achieves high performance for the noise reduction, it is not too practical method because of its high computational cost. This paper describes a practical method to reduce ambient noise in the ADM using adjacent 3ch observations. Concretely, the noise component is reduced by generating two difference signals among three signals of 3ch observations in the noisy environment. Then, the ADM using the crossspectrum method is applied to them. The difference signals can be obtained with a small computational cost. The validity of the proposed method is confirmed in the actual room under the condition where the SNR ratio is -10dB. As a result, the SNR is improved to 10.5 dB, demonstrating the validity of the proposed method. - Hajime Tai; Toshihiro Shinohara; Tetsuji Uebo; Noboru NakasakoIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan (IEE Japan) 141 (1) 61 - 67 0385-4221 2021/01 [Refereed]
Under ideal conditions with low noise, the acoustic distance measurement (ADM) method using the cross-spectrum for adjacent 2ch observations shows sufficient distance estimation performance. Increasing noise will deteriorate the distance estimation performance. To reduce noise, even if complex ICA is applied to adjacent 2ch noisy observations, sufficient separation performance for distance measurement cannot be exhibited, because the microphones are too close. Thus, if the ADM method using the cross-spectrum is applied to the separated signals of the adjacent 2ch noisy observations, an incorrect distance near 0 m is estimated because of the effect of measurement system. Therefore, by increasing the number of microphones (which increases information and can be expected to improve the separation performance), and applying complex ICA to improve the separation performance, ADM using the cross-spectrum for the new separation signals is proposed. This method enables us to obtain distance estimation that eliminates both environmental noise and the effect of the measurement system. The validity of the proposed method is also verified with the experiment of the actual distance measurement. As a result, it was found that the distance 1 m to the target can be measured under the noise of SNR (Signal to Noise Ratio) -10 dB. - Cause of Spurious Peaks on Acoustic Distance Measurement (Comparison of Methods Using 1ch and 2ch Observations)Itsuki Yamakado; Toshihiro Shinohara; Tetsuji Uebo; Noboru NakasakoProc. on the 2020 International Conference on Emerging Technologies for Communications (ICETC 2020) 1 - 1 2020/12 [Refereed]
- Noboru Nakasako; Hajime Tai; Toshihiro Shinohara; Tetsuji UeboICIC Express Letters, Part B: Applications 11 (10) 913 - 920 2185-2766 2020/10 [Refereed]
© 2020, ICIC International. All rights reserved. In various fields, the distance to a target is important information. An acoustic distance measurement (ADM) method based on interference between transmitted and reflected waves using audible sound has been proposed. Environmental noise inevitably contaminates observations, and countermeasures against noise are indispensable. Synchronous addition is a method of reducing noise, but this method requires multiple measurements, and correct results cannot be obtained if the sound environment changes. There is also an attempt to reduce noise based on independent component analysis (ICA) using two-channel (2ch) observation signals. In the present study, the goal is to perform distance estimation in a single measurement under high noise. Signal separation by complex ICA using 2ch microphones (mic’s) is less accurate when the mic’s are closer than the sampling interval. In other words, it is difficult to obtain an accurate separation result only using two mic’s. Therefore, ICA is applied to two sets of two signals among 3ch observation signals with one additional mic, and after restoring two ranging signals to the mic positions, the ADM method using the cross-spectral method is applied. Finally, in order to confirm the effectiveness of the proposed method, this method is applied to an actual sound environment. - TOMINAGA Shigeru; YOSHIDA Hisashi; NAKASAKO Noboru; IWAKI TatsuyaIEICE Trans. Infomation and Systems (Japanese Edition) J102-D (5) 399 - 410 1881-0225 2019/05 [Refereed]
- Song ChangRyung; Toshihiro Shinohara; Tetsuji Uebo; Noboru NakasakoIEEJ Transactions on Electronics, Information and Systems 138 (10) 1223 - 1229 0385-4221 2018/10 [Refereed]
- Changryung Song; Toshihiro Shinohara; Tetsuji Uebo; Noboru NakasakoICIC Express Letters, Part B: Applications 9 (9) 899 - 906 2018/09 [Refereed]
- Noboru Nakasako; Kohsuke Sakaguchi; Toshihiro Shinohara; Tetsuji UeboICIC Express Letters, Part B: Applications 9 (8) 737 - 745 2018/08 [Refereed]
- Noboru Nakasako; Shinya Honda; Toshihiro Shinohara; Testuji UeboTrans. of the Institute of Systems, Control and Information Engineers THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE) 30 (9) 339 - 346 2017/09 [Refereed]
The distance to a target is fundamental information in many engineering applications. Recently,an acoustic distance measurement (ADM) method has been proposed based on the interference between transmitted and reflected waves, but it requires two applications of the Fourier transform. The ADM method in which a linear chirp whose frequency changes linearly with lapse of time is adopted as a transmitted sound has been also proposed. However, due to the influence of the measuring system from the loudspeaker to the microphone, the ADM would often estimate the spurious short distance different from true distance. This paper describes a fundamental study on the ADM method by applying the cross-spectral method to observed signals of the adjacent two-channel (2ch) microphones, adopting a linear chirp as transmitted wave and removing the influence of the measuring system. More concretely, since the component of the interference of the transmitted wave and reflected wave is included in the observed signal and the interference is a function of the distance from the microphone to the target, the distance can be estimated by utilizing the interference. We confirmed the validity of the chirp-based ADM method by performing a computer simulation and by applying it to an actual sound field.
- Estimation of Distance to Sound Source in Noisy Environment Using Human Voice as Sound Source (Introduction of CrossSpectral Method between Actual and Pseudo Observed Waves and of Synchronous Addition)Shinya HONDA; Toshihiro SHINOHARA; Tetsuji UEBO; Masato NAKAYAMA; Noboru NAKASAKOIEICE Trans. Fundamentals(Japanese Edition) J100-A (7) 295 - 298 2017/07 [Refereed]
- Noboru Nakasako; Kohsuke Sakaguchi; Shinya Honda; Toshihiro Shinohara; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 137 (11) 1443 - 1444 1348-8155 2017 [Refereed]
This paper describes a noise reduction method for acoustic distance measurement using cross spectrum between 2ch observations, constructing analytic signal based on cosine and sine linear chirp sound. Specifically, synchronous addition is appplied to observed signals themselves or to their cross spectrum. - HANABUSA Shimpei; NAKASAKO Noboru; NAKAYAMA Masato; SHINOHARA Toshihiro; UEBO TetsujiTrans. of the Institute of Systems, Control and Information Engineers 60 (5) 216 - 224 2016/05 [Refereed]
- NAKASAKO Noboru; UEBO Tetsuji; SHINOHRA ToshihiroFundamentals Review The Institute of Electronics, Information and Communication Engineers 9 (4) 330 - 339 1882-0875 2016/04 [Invited]
The distance to a target is important information in various engineering fields. When measuring the distance to a target using audible sound, in general, an impulsive sound is transmitted toward the target and the time difference between the transmitted and reflected waves is obtained to determine the distance. However, this method cannot be applied to short distances where a reflected wave is buried in a transmitted wave. On the other hand, in the field of microwave radar, this distance measurement method has been proposed for plural targets, and can be applied to distances close to 0 m (i.e., a standing-wave radar). We have extended this distance measurement method so as to measure precisely the distance to the target in ranges close to 0 m by applying the principle of the standing wave radar to distance measurement using a sound signal. In this paper, first we will explain the principle of acoustical distance measurement methods based on phase interference using audible sound, and then by introducing an analytic signal, we describe in detail an acoustical distance measurement method, especially for a target that exists at a distance of around 0 m. Simulation results and experimental results are also shown. - Tomofumi Nakano; Noboru Nakasako; Toshihiro Shinohara; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 136 (11) 1551 - 1552 1348-8155 2016 [Refereed]
Ultrasonic waves were very often used to measure the distance to a target. Authors proposed a distance measurement method based on phase interference between the transmitted and reflected audible sounds. This paper describes a new trail on the distance measurement using ultrasonic waves for close range by using a single transducer. - Shinya Honda; Noboru Nakasako; Toshihiro Shinohara; Tetsuji Uebo; Masato NakayamaIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 136 (11) 1525 - 1531 1348-8155 2016 [Refereed]
The sound source localization problem (identifying the distance and the direction from sound source) has been important in various engineering fields and many approaches have been developed, e.g., MUSIC (MUltiple SIgnal Classification). However, they often require a microphone array with multiple microphone elements to obtain such information. Meanwhile, since the distance to a target is also important, many distance measurement methods with sound have been proposed. We proposed an acoustic distance measurement (ADM) method based on interference between transmitted and reflected waves, which could measure distance at a short range. Existing ADM methods based on interference make errors due to the measuring system from the loudspeaker to the microphone. To remove the effect of the measuring system, a cross-spectral analysis was applied to the observed wave and the pseudo-observed wave, convolving the transmitted wave with the impulse response of the measuring system a priori measured. Attaching a microphone to a target causes multiple reflections (interference between the sound source and the target). This paper describes a method based on the phase interference to estimate the distance between a sound source and a target (reflector), using a single-channel cross-spectrum between the observed and the pseudo-observed waves. The validity and effectiveness of the proposed method is confirmed through simulation and experiment. - Kazuhiro Suzuki; Noboru Nakasako; Masato Nakayama; Toshihiro Shinohara; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 135 (11) 1349 - 1350 1348-8155 2015/11 [Refereed]
The acoustic distance measurement(ADM) method based on phase interference has been proposed. However, it becomes difficult for ADM to measure the distance to target shorter than distance resolution. Though the principled method for close range has been also proposed by introducing analytic signal, the measurement performance was degraded by the DC component of the power spectrum. This paper describes a new trail on the ADM with 2 ch microphones for very close range measurement by estimating and removing the DC component. - Noboru Nakasako; Shimpei Hanabusa; Toshihiro Shinohara; Masato Nakayama; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 134 (11) 1626 - 1627 1348-8155 2014/11 [Refereed]
The distance estimation method based on interference of linear chirp sound has been proposed. However, the measurement performance was degraded by additional noise. In this paper, we expand the method to a method that is robust to noisy environments by introducing a concept of synchronous addition and spectral subtraction. Finally, we confirm the validity and effectiveness of the expanded method through experiments. - Noboru Nakasako; Toshihiro Shinohara; Keiji Kawanishi; Tetsuji UeboELECTRONICS AND COMMUNICATIONS IN JAPAN WILEY-BLACKWELL 97 (8) 24 - 31 1942-9533 2014/08 [Invited]
In many engineering fields, distance to target is very important information. Typical distance measurement methods use the time delay between transmitted and reflected waves, but it is difficult to estimate short distances. A method for measuring short distances using a standing wave generated by phase interference of transmitted and reflected waves is known in the field of microwave radar. This method is given in a very simple form in which the distance between the microphone and target is estimated as the peak value of the range spectrum, which can be obtained from the Fourier transform of the power spectrum of the observed wave. However, since the minimum measurable distance depends on the bandwidth of the transmitted wave, measurement of shorter distances requires greater bandwidth of the transmitted wave. This paper describes a new distance estimation method that is effective from 0 m based on the phase interference of transmitted and reflected audible sound. Specifically, we introduce an analytic signal instead of the power spectrum and examine the validity and effectiveness of our method by applying it to an actual sound field. (C) 2014 Wiley Periodicals, Inc. - The Object Localization by Acoustic Distance Measurement Method Based on Phase Interference with Cross-Spectral MethodKazuhiro SUZUKI; Noboru NAKASAKO; Masato NAKAYAMA; Toshihiro SHINOHARA; Tetsuji UEBO; Manabu FUKUSHIMAIEICE Trans. Fundamentals(Japanese Edition) J97-A (4) 343 - 346 2014/04 [Refereed]
- Masato Nakayama; Takanobu Nishiura; Ryota Okuno; Noboru Nakasako2014 IEEE ASIA PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS (APCCAS) IEEE 447 - 450 2014 [Refereed]
Parametric loudspeaker can form an acoustic beam with sharper directivity by using multiple small ultrasonic transducers. In recent years, acoustic beam steering methods based on delay-processing for multiple small ultrasonic transducers is proposed. However, in these methods, spatial aliasing in ultrasonic waves has not been focused. Therefore, in this paper, we investigate the relationship between the spatial aliasing of ultrasonic waves and the acoustic beam of audible sounds. In addition, we propose acoustic beam steering with parametric loudspeaker by individual delay-filtering for carrier and sideband waves. - Nobuyuki Yamawaki; Noboru Nakasako; Tatuya Nishimae; Toshihiro Shinohara; Masato Nakayama; Daichi Yoshida2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS) IEEE 336 - 339 2013 [Refereed]
Patients who have difficulty moving their muscles freely require support for various situations that occur in everyday life. A controllable robot arm without using muscles may make the patient's quality of life improve. By using a brain-computer interface (BCI), control of the robot arm is possible by thought alone. Therefore, we have constructed several robot arms with an ultrasonic range finder and a web camera for BCI system. By utilizing these devices, collisions between the robot arm and the user could be avoided and control could be partially automated. The distance is very important information in the system. In the present work, an acoustic distance measurement (ADM) device was used. It consists of equipment with easy acquisition and does not need an electronic circuit which is in the ultrasonic range finder. It is a new device and has a possibility of simplifying the ADM device. - Noboru Nakasako; Tatuya Nishimae; Toshihiro Shinohara; Nobuyuki Yamawaki; Masato Nakayama; Tetsuji Uebo2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS) IEEE 332 - 335 2013 [Refereed]
Since the distance to target is very important information, we have proposed an acoustic distance measurement (ADM) method using a standing wave, which is generated by interference between transmitted and reflected waves. However, the amplitude-frequency characteristics of the measuring system between the microphone and the loudspeaker are not considered, but these characteristics cannot be ignored in a real environment. To remove the effect of the measuring system, our previous methods required a 2ch microphone or two measurements with targets and without targets. This paper describes a new ADM method considering a movement of transmitting-and-receiving system composed of 1ch microphone and loudspeaker. Finally, we examine the validity and effectiveness of our method by applying it to an actual sound field. - Masato Nakayama; Kazuhiro Suzuki; Noboru Nakasako2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP) IEEE 423 - 427 1520-6149 2013 [Refereed]
In a number of engineering fields, information on the distance to the target is very important. We previously proposed an acoustic distance measurement method based on interference between the transmitted and reflected waves, which can be used for distance measurement over a short range. In the previously proposed method, a sound source of the transmitted wave must be known in advance. In the present paper, we propose a new acoustic distance measurement method based on phase interference obtained using the cross-spectral method with adjacent microphones, which does not require the condition that a sound source of the transmitted wave is known. Finally, we confirmed the validity and effectiveness of the newly proposed method through both computer simulation and evaluation experiment in a real environment. - Masato Nakayama; Noboru Nakasako; Tetsuji Uebo; Manabu FukushimaAcoustical Science and Technology 日本音響学会 34 (3) 197 - 205 1346-3969 2013 [Refereed]
In a number of engineering fields, information on the distance to the target is very important. We previously proposed an acoustic distance measurement method based on interference between the transmitted and reflected waves, which can be used for distance measurement over a short range. The previously proposed method requires equipment such as a loudspeaker and a microphone for cancellation processing of background components due to the spectrum of the transmitted wave and the transfer function of the measurement system in real environments. Therefore, in the previously proposed method, a sound source of the transmitted wave must be known in advance. In the present paper, we propose a new acoustic distance measurement method based on phase interference obtained using the cross-spectral method with stereo microphones, which does not require the condition that a sound source of the transmitted wave is known. The conventional cross-spectral method requires a measuring remote microphone and a reference microphone to be placed near a loudspeaker, meanwhile the proposed method requires stereo microphones to be placed near a sound source. Finally, we confirmed the validity and effectiveness of the newly proposed method through computer simulations and evaluation experiments in real environments. © 2013 The Acoustical Society of Japan. - Masato Nakayama; Takanobu Nishiura; Yoichi Yamashita; Noboru NakasakoAcoustical Science and Technology 日本音響学会 34 (2) 80 - 88 1346-3969 2013 [Refereed]
Beamforming with a microphone-array is an ideal candidate for distant-talking speech recognition. An adaptive beamformer can achieve beamforming with a small microphone-array, but it had difficulty extracting distant-moving speech and reducing moving noises, because it must rapidly train long multiple-channel adaptive filters by using observed noises with a microphone-array. However, if positions of both talkers and noises can be estimated, adaptive filters may not need to be trained in real noisy environments. Therefore, we propose a multiple-nulls-steering beamformer based on both talker and noise localization that does not require adaptive training with observed noises. Finally, we confirmed the validity and effectiveness of the proposed method through computer simulations and evaluation experiments in real noisy environments. © 2013 The Acoustical Society of Japan. - Noboru Nakasako; Toshihiro Shinohara; Keiji Kawanishi; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 132 (11) 1749 - 1755 1348-8155 2012 [Refereed]
In many engineering fields, distance to target is very important information. Typical distance measurement methods use time delay between transmitted and reflected waves, but it is difficult to estimate short distance. On the other hand, a method for measuring short distances using a standing wave, which is generated by phase interference of transmitted and reflected waves, is known in the field of microwave radar. This method is given in a very simple form such that the distance between microphone and target is estimated as a peak value of the range spectrum, which can be obtained by Fourier transform of the power spectrum of the observed wave. However, since the minimum measurable distance depends on the bandwidth of the transmitted wave, the shorter distance measurement requires the wider bandwidth of the transmitted wave. This paper describes a new distance estimation method measurable from 0m based on the phase interference of transmitted and reflected audible sound. More concretely, we introduce an analytic signal instead of the power spectrum and examine the validity and effectiveness of our method by applying it to an actual sound field. © 2012 The Institute of Electrical Engineers of Japan. - Masato Nakayama; Yuma Neki; Noboru Nakasako; Toshihiro Shinohara; Tetsuji Uebo; Takanobu NishiuraIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 132 (11) 1774 - 1775 1348-8155 2012 [Refereed]
In robot sensors and security systems, both range and velocity to a moving target are very important. In this paper, we propose a method to estimate both range and velocity based on the phase interference of subband-divided and timedelayed impulse sound to a moving target in a short range. Evaluation experiments revealed that the proposed method was valid because the proposed method was measurable both range and velocity to a moving target. © 2012 The Institute of Electrical Engineers of Japan. - Nakasako Noboru; Kawanishi Keiji; Shinohara Toshihiro; Nakayama Masato; Uebo Tetsuji2012 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2012 680 - 685 2012 [Refereed]
Since the distance to target is very important information, we have proposed an acoustic distance measurement using a standing wave, which is generated by interference between transmitted and reflected waves. This method is given in a very simple form such that the distance between microphone and target is estimated as a peak value of the range spectrum (i.e., the absolute value of Fourier transform with respect to the power spectrum of the observed wave). However, to measure the short distance, the wide bandwidth of the transmitted wave is required. This paper describes a new distance estimation method measurable from 0 m based on the interference between transmitted and reflected audible sound, especially using only a single microphone (i.e., single channel observations). More concretely, we introduce an analytic signal instead of the power spectrum and examine the validity and effectiveness of our method through computer simulation and by applying it to an actual sound field with a band-limited impulse sound. © 2012 IEEE. - Masato Nakayama; Yuma Neki; Noboru Nakasako; Tetsuji Uebo; Takanobu Nishiura2012 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2012 674 - 679 2012 [Refereed]
The distance to talkers is very important information for both hands-free speech interfaces and nursing-care robots. We have proposed an acoustic distance measurement method based on interference between the transmitted and reflected waves, which can measure distance in a short range. In the present paper, we propose an acoustic distance measurement method based on interference of speech presented by a dialogue system. In a dialogue system, dry sources of presented speech are known. Therefore, we can easily perform voice activity detection (VAD) for presented speech using a phoneme segmentation with a hidden Markov model. The proposed method estimates the distance to talkers in speech segments using the results of VAD. Finally, we confirmed the effectiveness of the proposed method through experiments in real environments. © 2012 IEEE. - A simplified estimation method for environmental noises using independent component analysisYasuo Mitani; Noboru Nakasako19th International Congress on Sound and Vibration 2012, ICSV 2012 4 2673 - 2679 2012Paying attention to the actual environmental noise, it is very often that an objective noise fluctuation is contaminated by the other noise sources. That is, in the actual acoustic measurement, the acoustic signal is measured by a sound level meter under the mixture of several noise sources. On the other hand, the estimation of the probability distribution function of environmental noise is essential in the field of noise evaluation and/or regulation problems, since almost all indices such as Leq (A-Weighted Equivalent Sound Level) and Lx (x=5, 10, 50, ⋯ (100-x) percentage point of the cumulative sound level distribution) can be evaluated through this probability distribution. In this paper, we propose a probabilistic estimation method for the objective noise using Independent Component Analysis (ICA). At this time, we introduce a simplified model of general linear instantaneous mixture. Finally, the effectiveness of the proposed method has been experimentally confirmed by applying it to actual noise data.
- Norimitsu Ohmata; Tetsuji Uebo; Noboru Nakasako; Toshihiro ShinoharaELECTRICAL ENGINEERING IN JAPAN WILEY-BLACKWELL 177 (2) 41 - 48 0424-7760 2011/11 [Invited]
In many engineering fields, the distance to target is very important information. In a typical method, the distance is estimated by measuring the time delay between transmitted and reflected waves. However, it is difficult to estimate short distances with a method like this. In the field of microwave radar, a method using standing waves to measure short distances and multiple targets is known. We have applied this method to distance estimation using audible sound and have shown the validity of this method by our simulations and experiments. In this paper, we present a prototype system for distance estimation in which this method is implemented, and evaluate the performance of this system by experiments in an actual sound field. (C) 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 177(2): 41-48, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21160 - Masato Nakayama; Shimpei Hanabusa; Tetsuji Uebo; Noboru NakasakoIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E94A (8) 1638 - 1646 0916-8508 2011/08 [Refereed]
Distance to target is fundamental and very important information in numerous engineering fields. Many distance measurement methods using sound use the time delay of a reflected wave, which is measured in reference to the transmitted wave. This method, however, cannot measure short distances because the transmitted wave, which has not attenuated sufficiently by the time the reflected waves are received, suppresses the reflected waves for short distances. Therefore, we proposed an acoustic distance measurement method based on the interference between the transmitted wave and the reflected waves, which can measure distance in a short range. The proposed method requires a cancellation processing for background components due to the spectrum of the transmitted wave and the transfer function of the measurement system in real environments. We refer to this processing as background components cancellation processing (BGCCP). We proposed BGCCP based on subtraction or whitening. However, the proposed method had a limitation with respect to the transmitted wave or additive noise in real environments. In the present paper, we propose an acoustic distance measurement method based on the new BGCCP. In the new BGCCP, we use the calibration of a real measurement system and the whitening processing of the transmitted wave and introduce the concept of the cepstrum to the proposed method in order to achieve robustness. Although the conventional BGCCP requires the recording of the transmitted wave under the condition without targets, the new BGCCP does not have this requirement. Finally, we confirmed the effectiveness of the proposed method through experiments in real environments. As a result, the proposed method was confirmed to be valid and effective, even in noisy environments. - Masato NAKAYAMA; Shimpei HANABUSA; Noboru NAKASAKO; Toshihiro SHINOHARA; Tetsuji UEBOIEICE Trans. Fundamentals(Japanese Edition) 電子情報通信学会 J94-A (8) 676 - 679 0913-5707 2011/08 [Refereed]
我々はこれまで,可聴音域に拡張した送信波と反射波の位相干渉に基づく近距離推定法について検討してきた.本研究では,対象物のある環境とない環境での同期収録信号をスペクトル減算することで,バックグラウンド要素を除去する音響測距法を検討する. - Masato NAKAYAMA; HIROHATA Kazuki; Noboru NAKASAKOIEICE Trans. Fundamentals(Japanese Edition) 電子情報通信学会 J94-A (5) 313 - 322 0913-5707 2011/05 [Refereed]
特定の場所の音環境を立体的に再現する技術として,頭部伝達関数(Head Related Transfer Function:HRTF)を事前に計測して適用するバイノーラル方式と任意の位置にある複数の遠隔スピーカを利用するトランスオーラル方式が提案されている.バイノーラル方式はヘッドホンの着用が煩わしく,トランスオーラル方式は機器の個数や計算量の点で非常に複雑かつ大規模なシステムとなる問題がある.一方,我々はこれまで,スピーカとその近傍のマイクロホンで収録した直接音と反射音の位相干渉を利用した音響測距法を提案してきた.この音響測距法は,スピーカと受聴者の耳元間の距離計測に利用できる.この距離情報とスピーカ配置を考慮することで,トランスオーラル方式と比べて小規模な立体音場再現システムを実現できる可能性がある.そこで本研究では,受聴者の頭部の左右近傍に設置したスピーカ-マイクロホン対を利用した音響測距法に基づく立体音場再現手法を提案する.更に,理論の正当性を確認するための予備実験と,HRTFにより定位を付与した音楽による主観評価実験を行うことで,提案手法の有効性を確認する. - Masato Nakayama; Shimpei Hanabusa; Noboru Nakasako; Toshihiro Shinohara; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 131 (11) 1864 - 1870 1348-8155 2011 [Refereed]
In many engineering fields, distance to targets is very important. General distance measurement method uses a time delay between transmitted and reflected waves, but it is difficult to estimate the short distance. On the other hand, the method using phase interference to measure the short distance has been known in the field of microwave radar. Therefore, we have proposed the distance estimation method based on interference between transmitted and reflected audible sound, which can measure the distance between microphone and target with one microphone and one loudspeaker. However, the distance measurement performance of the proposed method was degraded by additional noise in noisy environment. In this paper, the acoustic distance measurement method based on the interference between the transmitted wave and the reflected waves is expanded to a noise-robust method in a noisy environment. In order to measure distance in a low-signal-to-noise ratio (low-SNR) environment, we introduce a concept from synchronous addition and spectral subtraction to the proposed method. Evaluation experiments in a real environment reveal that the proposed method was valid and effective because the proposed method could measure distance in a low-SNR environment. © 2011 The Institute of Electrical Engineers of Japan. - Multiple-nulls-steering beamformer based on both talkers and noises localizationMasato Nakayama; Takanobu Nishiura; Yoichi Yamashita; Noboru Nakasako40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 2 1393 - 1398 2011For tele-conference systems or voice-controlled systems, it is very important that distant-talking speeches with a high quality are separately extracted in environments including multiple talkers and noises. Beamforming with microphone-array is an ideal candidate for overcoming this problem. In reverberant environments, the beamforming technology had difficulty in extracting distant-moving speeches and in reducing moving noises because conventional methods must rapidly train multiple-channel adaptive filters with long filter length by using observed noises with microphone-array. However, if positions of talkers and noises can be estimated, it may be not necessary that adaptive filters are trained in real noisy environments. Therefore, we propose the multiple-nulls-steering beamformer based on talkers and noises localization, which doesn't require training with observed noises. The proposed method applies rapidly multiple pre-designed null-steering-filters without observed noises on the basis of talkers and noises localization. Also, multiple null-steering-filters are trained on the basis of positional information by talkers and noises localization and those mobility predictions. The proposed method utilizes the integrating system of loudspeaker and microphone-array. In the proposed method, positions of talkers are estimated by the acoustic distance measurement method based on interference, and positions of noises are estimated by the cross-power spectrum phase analysis method. Additionally, in order to apply null-steering-filters to observed signals in real environments, the proposed method performs calibration of variations in each channel by using loudspeaker and microphone-array. Finally, we will confirm the effectiveness of the proposed method through real experiments. Copyright © (2011) by the Institute of Noise Control Engineering.
- Noboru NAKASAKO; Tetsuji UEBO; Toshihiro SHINOHARASYSTEMS, CONTROL AND INFORMATION システム制御情報学会 54 (8) 314 - 319 2010/08 [Invited]
- Tetsuji Uebo; Noboru Nakasako; Norimitsu Ohmata; Hanae ItagakiELECTRONICS AND COMMUNICATIONS IN JAPAN SCRIPTA TECHNICA-JOHN WILEY & SONS 93 (7) 53 - 60 1942-9533 2010/07 [Invited]
In many engineering fields, the distance to target is fundamental and very important information. Acoustical signals, such as audible sound or ultrasound, often play an essential role in measurement of distance. To measure distance, the time delay of the reflected wave measured with reference to the transmitted pulse wave, that is, the time-of-flight (TOF), is typically used. However, this method cannot measure short distances because the transmitted wave, which has not attenuated enough at the time of reception of the reflected waves, suppresses the reflected waves for a short distance. Meanwhile, in microwave radar research, a novel method using standing waves has been recently proposed in order to measure the distances to multiple targets, even if short. We apply the fundamental principle of this method to the estimation of short distances for multiple targets using audible sound. In this paper, we focus our attention on audible band-limited noise. To verify the validity and effectiveness of our method, we perform computer simulations and experiments. It is confirmed that short distances to multiple targets, such as the distances to two targets located 0.1 and 1 m away, can be estimated properly by our method. (C) 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(7): 53-60, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10248 - Noboru Nakasako; Toshihiro Shinohara; Atsushi Mori; Tetsuji UeboThe Jounal of the INCE (Institute of Noise Control Engineers) of Japan (社)日本騒音制御工学会 34 (2) 186 - 194 0386-8761 2010/04 [Refereed]
- Masato Nakayama; Noboru Nakasako; Toshihiro Shinohara; Tetsuji UeboIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 130 (11) 14 - 2000 1348-8155 2010 [Refereed]
In many engineering fields, distance to targets is very important. General distance measurement method uses a time delay between transmitted and reflected waves, but it is difficult to estimate the short distance. On the other hand, the method using phase interference to measure the short distance has been known in the field of microwave radar. Therefore, we have proposed the distance estimation method based on interference between transmitted and reflected audible sound, which can measure the distance between microphone and target with one microphone and one loudspeaker. In this paper, we propose talker localization method based on distance estimation using phase interference. We expand the distance estimation method using phase interference into two microphones (microphone array) in order to estimate talker position. The proposed method can estimate talker position by measuring the distance and direction between target and microphone array. In addition, talker's speech is regarded as a noise in the proposed method. Therefore, we also propose combination of the proposed method and CSP (Cross-power Spectrum Phase analysis) method which is one of the DOA (Direction Of Arrival) estimation methods. We evaluated the performance of talker localization in real environments. The experimental result shows the effectiveness of the proposed method. © 2010 the Institute of Electrical Engineers of Japan. - Shimpei Hanabusa; Tetsuji Uebo; Yuuta Tsuchida; Toshihiro Shinohara; Noboru NakasakoIEEJ transactions on electronics, information and systems 電気学会 129 (11) 2027 - 2033 2009/11 [Refereed]
- 靍 真紀子; 武田 昌一; 中迫 昇; 中川 秀夫Memoirs of the School of Biology-Oriented Science and Technology of Kinki University 近畿大学生物理工学部 (23) 1 - 14 1342-7202 2009/03 [Refereed]
「怒り」,「喜び」,「悲しみ」などの感情を表現した自然音声の音響的特徴を「韻律(声の大きさ,高さ,発話速度の総称)」という視点から解析してきた。筆者らの研究の特徴は,より微妙なニュアンスの特徴まで調べることを目的に,それぞれの感情を,感情を含まない「平常」のほか,「弱い」,「中程度」,「強い」の4段階の度合に分類して解析を行い,それぞれの特徴を体系的に明らかにしてきたことである。
会話によるコミュニケーションにおいて,話者の心の内面にある感情がそのまま発声に反映され,更にそのまま聞き手に伝わるとは限らない。
本研究の目的は,(1)このような話者の内面の感情(話者の意図)がどの程度正しく聞き手に伝わるのか,(2)どのような表現のときに話者の意図した感情が正しく聞き手に伝わりやすいのか,を定量的に明らかにすることである。
そこでまず,発話の意図がどの程度聞き手の聴覚的印象と一致しているかを調 - Norimitsu Ohmata; Tetsuji Uebo; Noboru Nakasako; Toshihiro ShinoharaIEEJ Transactions on Electronics, Information and Systems Institute of Electrical Engineers of Japan 129 (2) 18 - 319 1348-8155 2009 [Refereed]
In many engineering fields, distance to target is very important information. As a typical method, distance is estimated by measuring time delay between transmitted and reflected waves. However, it is difficult to estimate short distance by a method like this. On the other hand, a method using standing wave to measure short distances has been known in the field of microwave radar. We have applied this method to distance estimation using audible sound and shown the validity of that through our simulations and experiments. In this paper, we present the prototype system for distance estimation in which this method is implemented, and evaluate the performance of this system by experiments in actual sound field. © 2009 The Institute of Electrical Engineers of Japan. - Tetsuji Uebo; Noboru Nakasako; Norimitsu Ohmata; Atsushi MoriAcoustical Science and Technology 日本音響学会 30 (1) 18 - 24 1346-3969 2009 [Refereed]
Distance to target is fundamental and very important information in many engineering fields. In some applications sound is often used to measure distances to targets. For this purpose, the time delay of reflected wave is typically used. This method, however, can not measure short distance because the transmitted wave, which has not attenuated enough as of reception of reflected waves, suppresses the reflected waves for short distance. Meanwhile, in the research field of microwave radar, to measure distances to multiple targets even if they are short, a novel method by using standing wave has been recently proposed. In this paper, we apply the fundamental principle of this method to measurement of short distance for multiple targets using sound wave. Specifically, we focus our attention on audible band-limited signal with random phases. To verify the validity and effectiveness of our method, we perform computer simulations and experiments. As a result, it has been confirmed that short distances to multiple targets, such as the distances of two targets located at 0.5 m and 1 m, can be measured by our method. © 2009 The Acoustical Society of Japan. - T. Uebo; N. Nakasako; N. Ohmata; H. ItagakiIEEJ transactions on electronics, information and systems 電気学会 128 (7) 1117 - 1122 0385-4221 2008/07 [Refereed]
In many engineering fields, distance to target is fundamental and very important information. Acoustical signal, such as audible sound or ultrasonic, often plays an essential role in measurement of distance. To measure distance, the time delay of reflected wave measured with reference to transmitted pulse wave, i.e. time-of-flight (TOF) is used typically. This method, however, can not measure short distance because the transmitted wave, which has not attenuated enough as of reception of reflected waves, suppresses the reflected waves for short distance. Meanwhile, in the research field of microwave radar, to measure distances to multiple targets even if short, a novel method by using standing wave has been recently proposed. We apply the fundamental principle of this method to estimation of short distance for multiple targets using audible sound. In this paper, we focus our attention on audible band-limited noise. To verify the validity and effectiveness of our method, we perform computer simulations and experiments. As a result, it has been confirmed that short distances to multiple targets, such as the distances to two targets located at 0.1m and 1m, can be estimated properly by our method. - Noboru Nakasako; Tetsuji Uebo; Atsushi Mori; Norimitsu OhmataIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E91A (4) 1218 - 1221 0916-8508 2008/04 [Refereed]
In the research field of microwave radar, a range finding method based on standing wave is known to be effective for measuring short distances. In this paper, we focus our attention on audible sound and fundamentally examine the distance estimation method in which acoustical standing wave is used. - EEG analysis based on Independent Component Anlaysis and positive time-frequency distributionN. Nakasako; H. Yoshida; N. YamawakiMemoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University 近畿大学生物理工学部 (19) 23 - 35 2007/04 [Refereed]
- Sound reduction property of one-dimensional duct with random loadingNoboru Nakasako; Hisanao Ogura; Aya IshikawaInstitute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006 3 1956 - 1965 2006It is known that sound field in a one-dimensional duct can be simply expressed on the basis of a transmission line model. Authors have proposed ANC system probing sound pressures at arbitrary two points of the transmission line, though only the two-point probing for sound pressure between the primary and the secondary sources has been utilized for the sake of simplification of ANC circuit. The one-dimensional acoustic duct can be expressed by a transmission line model commonly used in the study of microwave waveguideh. The authors have also analyzed the sound decaying property in a case when the sound propagates through random media based on the circuit theory. The computer simulation demonstrates the damping effect for random media. However, producing the sound field according to this method corresponds to a random change of medium itself in one-dimensional duct and it must be unrealistic. Along the transmission line model with the existence of random media, this paper describes the sound decaying property of the random loadings using the equivalent circuit representation for a sound duct. Finally the validity of the proposed theory is confirmed through computer simulation.
- MITANI Yasuo; TSUTSUMOTO Kazuhiro; NAKASAKO NoboruThe Memoirs of the Faculty of Engineering,Fukuyama University. Fukuyama University 29 1 - 8 0286-858X 2005/12In order to establish an objective approach for evaluating human emotions, Emotional Spectrum Analysis Method (ESAM) has been proposed by Dr. T. Musha et al. It is possible to estimate emotion spectrums with four basic emotional states (i.e., anger/stress, joy, sadness and relaxation) by using ESAM and the measured data of brain waves. Now, we pay attention to the emotional evaluation of music sounds. More specifically, this paper describes the influence of a change of music sounds with different tones (from a minor scale to a major scale) on human emotions. The brain waves for six subjects are measured by electroencephalogram (EEG). Each emotion spectrum can be estimated by using the emotion spectrum analysis system developed by Brain Functions Laboratory, Inc. based on ESAM. The effectiveness of ESAM is experimentally confirmed by applying it to the emotion evaluation problem of the above two kinds of music sounds. We find out the possibility of ESAM for the objective evaluation in the field of music.
- A Practical Countermeasure to Wind-induced Noise in Environmental Noise Measurement Based on Linear and/or Non-linear Model Using Wind Speed InformationNoboru Nakasako; Koichi Sakamoto; Hitoshi Itoh; Yoshiaki TakakuwaMemories of the School of Biology-oriented Science and Technology of Kinki University 近畿大学生物理工学部 (16) 19 - 28 2005/10 [Refereed]
本研究では,風速から風雑音を推定し,その風雑音を風雑音下の観測信号から除去することにより信号のみを抽出する簡便な手法を提案する.具体的には,風速を入力とする線形・非線形のシステムモデルを用い風雑音の音圧レベルをまず推定する.ついで,その推定した風雑音を観測信号から音のエネルギースケールで減算し,風雑音成分を除去する.線形モデルとしてはMAフィルタ,非線形フィルタとしてニューラルネットワークを採用する.また,線形成分はMAフィルタで捉え,それからズレた非線形成分についてはニューラルネットワークで補正する組み合わせ手法も提案する.最後に,実際の風雑音混入下において音響信号を検出する問題に本手法を適用し,その有効性を検証した.(英文) - Noboru Nakasako; Hisanao Ogura; Aya IshikawaAcoustical Science and Technology (社)日本音響学会 26 (4) 374 - 377 1346-3969 2005/07 [Refereed]
Sound decaying property in the random media using the equivalent circuit representation for a sound duct was described. The simulation of the random duct based on the fluctuating medium was performed. The sound field in one-dimensional random media was analyzed in terms of the equivalent circuit representation. It was shown that the exponential decay constant was approximately proportional to the variance of the random medium. - N Nakasako; H Ogura; T Deguchi; A Ishikawa2004 47TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL III, CONFERENCE PROCEEDINGS IEEE 159 - 162 2004 [Refereed]
Active noise control (ANC) in a one-dimensional duct can be expressed in terms of a transmission line model. Thus, the proposed ANC system probes sound pressures at arbitrary two points of the transmission line, differing from a usual system such as Filtered-x. The frequency response function of ANC circuit is obtained and then the two-stage digital filter for control is realized. More concretely, the first stage filter generates the voltage and current at the secondary source position from the observations and the second one produces the secondary source. Finally the validity of the proposed theory is confirmed through simulation. - Fundamental study on sound source localization and restoration Introduction of blind source separation and inverse filtering(Invited paper)N.Nakasako; H. Ogura; Y. SakumaProc. 32nd International Congress and Exposition on Noise Control Engineering 1478 - 1485 2003/08 [Invited]
複数の混合音から複数の音源の位置を同定する手法を提案した。とくに今回は時間遅れを伴う混合を想定し、ブラインド分離により求まるパラメータを利用した。さらに逆フィルタ処理により信号のクリアな分離が可能となることも示した。(招待論文、英文) - Noboru NAKASAKO; Hisanao OGURASYSTEMS, CONTROL AND INFORMATION システム制御情報学会 46 (7) 400 - 408 2002/07 [Invited]
近年脚光を浴びている独立成分分析(Independent Component Analysis; ICA)について、著者らの研究成果を中心に基礎から、とくに音響信号処理に関連して解説した。瞬時混合の場合だけでなく音響計測では無視できない畳み込み混合の場合にも焦点を当てた。 - Noboru Nakasako; Mitsuo OhtaAcoustical Science and Technology 22 (5) 358 - 363 1346-3969 2001 [Refereed]
In the actual sound environment, the objective system often exhibits the non-Gaussian property, owing to physical, social and psychological factors. Many kinds of probability distributions have been proposed from various viewpoints to describe the probabilistic property of complicated random phenomena. Sometimes, a probability distribution of orthogonal series expansion type, which takes the well-known probability distribution (e.g., Gaussian, binomial distributions, etc.) as the first term and reflects the lower and higher order statistics in the expansion terms is also utilized. This paper describes a practical trial to choose the permissible order of series expansion, especially by introducing a pre-established tolerance range for the deviation of the theoretical cumulative probability from the experimental one. The minimal number of expansion terms can be rationally determined so as to satisfy the tolerance range. Finally, the effectiveness of this method is experimentally confirmed by applying it to the environmental noise. - N Nakasako; K Tsuruta; A Ikuta; M OhtaIEEE RO-MAN 2000: 9TH IEEE INTERNATIONAL WORKSHOP ON ROBOT AND HUMAN INTERACTIVE COMMUNICATION, PROCEEDINGS IEEE 35 - 40 2000 [Refereed]
Recently, the problem of independent component analysis and/or blind signal separation becomes a very popular and emerging field of research, because the problem contains many potential applications. In such a problem, a priori information we can. utilize is the statistical independency between source signals. In many actual fields, the independent component analysis must play an essential role but it also contains problems: it cannot be applicable to non-physical quantity like a human psychological or sensory one, etc. This paper proposes a fundamental trial of independent component analysis by introducing Fuzzy theory. More concretely, the parameters of unknown system are estimated on the basis of Fuzzy observations. Finally, the effectiveness of this method is confirmed through digital simulation. - Noboru Nakasako; Hisanao Ogura; Mitsuo OhtaJournal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 21 (1) 49 - 52 0388-2861 2000 [Refereed]
- Noboru Nakasako; Mitsuo OhtaJournal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) Acoustical Soc Jpn 19 (2) 113 - 120 0388-2861 1998 [Refereed]
In the actual situation, it is very difficult to evaluate the complicated sound environment only by using the lower order statistics of intensity such as Leq. In the actual acoustic measurement, a background noise always contaminates observation values and the statistics of the background noise are usually unknown. In this paper, the statistical independency between the acoustic signal and the background noise is introduced as an evaluation criterion to identify the sound insulation systems. That is, by considering the sound insulation wall as a linear system on an intensity scale, the system parameters are estimated on the basis of the statistical information from the lower to the higher orders, instead of employing the artificial evaluation criterion such as the least squares error method. Then, the output probability can be easily predicted by using the estimated parameters of the sound insulation system when the other input noise passes through the same insulation system. Finally, the validity and effectiveness of the proposed method are experimentally confirmed by applying it to the actually observed data. - Noboru Nakasako; Yasuo Mitani; Mitsuo OhtaJournal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) Acoustical Soc Jpn 19 (6) 391 - 396 0388-2861 1998 [Refereed]
This paper describes a new trial to estimate the statistical input-output relationship of complicated sound insulation systems in an actual situation when the input-output data are roughly observed due to the level-quantization mechanism of measuring equipment, especially from a practical viewpoint. Then, the output probability distribution for another kind of input can be predicted by using the estimated regression relationship. Finally, the effectiveness of the proposed method is experimentally confirmed by applying it to the actually observed data. - M Ohta; Y Mitani; N NakasakoJOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS TAYLOR & FRANCIS LTD 12 (5) 677 - 699 0920-5071 1998 [Refereed]
In this paper, a statistical electromagnetic (abbr., EM) interference study is constructed mainly from a theoretical viewpoint on the basis of N-dimensional random walk problem in multi-dimensional signal space. First, a characteristic function of the Hankel transform type matched to this EM environmental study is introduced especially in an extended form of D. Middleton's basic result. Then, the probability density function (abbr., pdf) is explicitly derived for the EM random fluctuation with a power scaled variable (or an effective value) measured by a receiver with a mean square operation. The proposed theory is verified by showing the agreement with one of D. Middleton's great researches as a special case of the proposed expressions. Moreover, the effectiveness of the proposed method is experimentally confirmed through an acoustic type simulation of EM environment and the application to a simplified actual EM environment with joint space-time non-Poisson interference as one of the same wave motion type environment as EM environment. - A probabilistic evaluation method of output response based on the extended regression analysis method for sound insulation systems with roughly observed dataN. Nakasako; M. 0hta; Y. MitaniIEICE Trans. Fundamentals E80-A (10) 1410 - 1416 1997/10 [Refereed]
- E Watanabe; N Nakasako; Y MitaniIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E80A (6) 971 - 976 0916-8508 1997/06 [Refereed]
This paper proposes a prediction method for non-stationary time series data with time varying parameters. A modular structured type neural network is newly introduced for the purpose of grasping the changing property of time varying parameters. This modular structured neural network is constructed by the hierarchical combination of each neural network (NNT: Neural Network for Prediction of Time Series Data) and a neural network (NNW: Neural Network for Prediction of Weights). Next, we propose a reasonable method for determination of the length of the local stationary section by using the additive learning ability of neural networks. Finally, the validity and effectiveness of the proposed method are confirmed through simulation and actual experiments. - A Ikuta; M Ohta; N NakasakoIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E80A (5) 825 - 832 0916-8508 1997/05 [Refereed]
In the measurement of actual random phenomenon, the observed data often contain the fuzziness due to the existence of confidence limitation in measuring instruments, permissible error in experimental data, some practical simplification of evaluation procedure and a quantized error in digitized observation. In this study, by introducing the well-known fuzzy theory, a state estimation method based on the above fuzzy observations is theoretically proposed through an establishment of wide sense digital filter under the actual situation of existence of the background noise in close connection of the inverse problem. The validity and effectiveness of the proposed method are experimentally confirmed by applying it to the actual fuzzy data observed in an acoustic environment. - Yasuo Mitani; Noboru Nakasako; Mitsuo OhtaJournal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) Acoustical Soc Jpn 18 (4) 183 - 190 0388-2861 1997 [Refereed]
The noise fluctuation is very often measured in a quantized level form at a discrete time interval. By paying attention to this quantization procedure of the actual noise measurement, in this paper, a precise estimation method for the probability distribution form is proposed by using the roughly observed data with quantized levels. That is, we first introduce theoretically a general statistical orthonormal expression of the probability density function for the original noise level fluctuation of continuous level type before passing through the level quantization measurement mechanism. Based on this quantization mechanism and the averaging operation of statistical information, we propose a reasonable estimation method of the distribution parameters in the above statistical expression by using the statistical information on the roughly observed data. The original probability distribution form of the continuous noise level can be precisely estimated by substituting the estimated distribution parameters into the introduced probability expression of general type. On the basis of this estimation theory, a precise evaluation method for the Lx and Leq noise evaluation indices is proposed. The effectiveness of the proposed method is confirmed experimentally too by applying it to first the simulation experiment and then the actual road traffic noise data. - N Nakasako; M OhtaELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE SCRIPTA TECHNICA-JOHN WILEY & SONS 79 (12) 1 - 11 1042-0967 1996/12 [Refereed]
A practical and suboptimal estimation algorithm, proposed as a signal restoration method based on Bayes' theorem, resembles a previously reported method used to design a wide sense digital filter, especially for noisy and level-quantized observations. The proposed method utilizes linear and nonlinear correlation information between the unknown acoustic signal and the observation value (before quantization operation) by using quantized level observations. The effectiveness of the proposed theory is confirmed experimentally through the simulation technique and by applying it to the actual reverberation data contaminated by a background noise. - N Nakasako; M OhtaIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E79A (8) 1252 - 1255 0916-8508 1996/08 [Refereed]
This paper describes a trial of evaluating the proper characteristics of multiple sound insulation systems from their output responses contaminated by unknown background noises, The unknown parameters of sound insulation systems are first estimated on the basis of the linear time series on an intensity scale, describing functionally the input-output relation of the systems. Then, their output probability distributions are predicted when an arbitrary input noise passes through these insulation systems. - A digital filter of restoring the stochastic signal from noisy and quntized observationsNoboru NAKASAKO; Mitsuo OHTAIEICE Trans. Fundamentals(Japanese Edition) J79-A (5) 1013 - 1021 1996/05 [Refereed]
- N Nakasako; M OhtaSICE '96 - PROCEEDINGS OF THE 35TH SICE ANNUAL CONFERENCE I E E E 1099 - 1104 1996 [Refereed]
- Noboru Nakasako; Mitsuo OhtaJournal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 17 (1) 27 - 32 0388-2861 1996 [Refereed]
This paper presents a practical prediction or transformation method from Lx data to Leq value, especially for the road traffic noise at night with a small traffic volume. The nonlinear relationship between Lx and Leq is grasped in principle by introducing a probabilistic neural network. Finally, the validity of the proposed method is experimentally confirmed too by applying it to the actually observed road traffic noise at night. © 1996, Acoustical Society of Japan. All rights reserved. - hta, A. Ikuta; N. NakasakoThe Journal of the Acoustical Society of Japan The Acoustical Society of Japan (ASJ) 51 (4) 299 - 306 0369-4232 1995/04 [Refereed]
現実の音環境における不規則信号は、様々な環境要因により複雑な変動特性を示すのが常である。本論文では、このような実状況の環境騒音に対する統計的一評価手法を原理的に提案している。特に実用性に考察の主点を置き、ごく少数個のみのパラメータを持つ単純・標準化された結果を、まず理論的枠組みに採る。次に、単純から複雑への拡張原理に支えられた2種情報処理法として、ニューラルネットワークとファジー確率論理を採り上げ、現実の音環境における複雑さへも適用可能な形態へと方法論を拡張する。最後に音環境での実測データに適用することにより、方法論の有効性を3種の実際的場合へ適用して原理的に確認している。 - Mitsuo Ohta; Noboru Nakasako; Yasuo MitaniTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 50 (10) 829 - 835 0369-4232 1994/10 [Refereed]
騒音・振動環境分野では、自然要因の多様さや人間評価の非画一性に基づいて、様々な評価量が提案され、それぞれ固有な長短所を待ち合わせている。本研究では、L_x(x=5,50,95)評価量を一具体例にとり、各評価量間で説明変数から目的変数への一方向的な変換関係を求める回帰分析法とは異なり、互いに優劣なく双方向に変換可能な代表的一関連様式を見出す目的で主成分分析法にまず着目する。次いで、各L_x評価量間では本質的に非線形な関連様式を潜在させることから、線形関連様式を主とした公知の主成分分析法を非線形関連様式へ一般化できる一試みを、その原則論に力点をおいて提案する。更に、実L_xデータ間に適用しその実際的有効性をも実証する。 - STOCHASTIC SIGNAL-DETECTION FROM A SATURATED NOISY OBSERVATION AND ITS APPLICATION TO ROOM ACOUSTICSM OHTA; N NAKASAKOJOURNAL OF SOUND AND VIBRATION ACADEMIC PRESS LTD 176 (2) 209 - 224 0022-460X 1994/09 [Refereed]
In the measurement of actual phenomena, the observed data often suffer from loss or distortion due to the limited dynamic range of the measurement instruments. This paper describes a new method of dynamical state estimation for stochastic systems, in a practical case in which the observed data fluctuates within a finite amplitude domain owing to the dynamic range of the measurement instrument. The state estimation method proposed for use with such incomplete observation data (with information loss or distortion) is a theoretically based improvement of the wide sense digital filter, for situations in which the data is contaminated by an external noise of arbitrary distribution type. A recurrence type estimation algorithm is explicitly derived in series expansion form from the Bayesian viewpoint, with the aim of utilizing hierarchically the linear and non-linear correlation information between the observed value and the unknown state variable. The proposed estimation theory is experimentally confirmed by applying it to a problem of background noise correction in room acoustics. - N NAKASAKO; M OHTA; H OGAWAIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E77A (8) 1353 - 1362 0916-8508 1994/08 [Refereed]
A specific signal in most of actual environmental systems fluctuates complicatedly in a non-Gaussian distribution form, owing to various kinds of factors. The nonlinearity of the system makes it more difficult to evaluate the objective system from the viewpoint of internal physical mechanism. Furthermore, it is very often that the reliable observation value can be obtained only within a definite domain of fluctuating amplitude, because many of measuring equipment have their proper dynamic range and the original random wave form is unreliable at the end of amplitude fluctuation. It becomes very important to establish a new signal processing or an evaluation method applicable to such an actually complicated system even from a functional viewpoint. This paper describes a new trial for the signal processing along the same line of the extended regression analysis based on the Bayes' theorem. This method enables us to estimate the response probability property of a complicated system in an actual situation, when observation values of the output response are saturated due to the dynamic range of measuring equipment. This method utilizes the series expansion form of the Bayes' theorem, which is applicable to the non-Gaussian property of the fluctuations and various kinds of correlation information between the input and output fluctuations. The proposed method is newly derived especially by paying our attention to the statistical information on the input-output data without the saturation operation instead of that on the resultantly saturated observation, differing from the well-known regression analysis and its improvement. Then, the output probability distribution for another kind of input is predicted by using the estimated regression relationship. Finally, the effectiveness of the proposed method is experimentally confirmed too by applying it to the actual data observed for indoor and outdoor sound environments. - Yasuo Mitani; Mitsuo Ohta; Noboru NakasakoTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 50 (5) 353 - 360 0369-4232 1994/05 [Refereed]
既発表の拡張型回帰分析法の解析基盤となるベイズ定理が原理的に情報量規範と等価な解を生むことを積極的に利用して、操作面上ベイズ定理より柔軟な極値探索型の情報量規範を適用することにより、複雑な住環境騒音を実用的に評価できる新たな一回帰分析法を提案した。情報量規範として入出力間の条件付エントロピーを最小にする評価規範を導入し、確率近似法を援用して入出力データを逐次採取することによってシステム同定ができる実用的手法を提案した。更にシステム同定時とは異なった変動形態を持つ他の任意入力がこの複雑なシステムに印加されたときの出力応答分布をきめ細かく予測できる一手法を見出した。本手法を実音響システムに対する応答出力分布の予測問題に適用し、その有効性の一端を実際的にも確認した。 - N NAKASAKO; M OHTA; Y MITANIIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E76A (9) 1392 - 1402 0916-8508 1993/09 [Refereed]
Most of actual environmental systems show a complicated fluctuation pattern of non-Gaussian type, owing to various kinds of factors. In the actual measurement, the fluctuation of random signal is usually contaminated by an external noise. Furthermore, it is very often that the reliable observation value can be obtained only within a definite fluctuating amplitude domain, because many of measuring equipments have their proper dynamic range and original random wave form is unreliable at the end of amplitude fluctuation. It becomes very important to establish a new signal detection method applicable to such an actual situation. This paper newly describes a dynamical state estimation algorithm for a successive observation contaminated by the external noise of an arbitrary distribution type, when the observation value is measured through a finite dynamic range of measurement. On the basis of the Bayes' theorem, this method is derived in the form of a wide sense digital filter, which is applicable to the non-Gaussian properties of the fluctuations, the actual observation in a finite amplitude domain and the existence of external noise. Differing from the well-known Kalman's filter and its improvement, the proposed state estimation method is newly derived especially by paying our attention to the statistical information on the observation value behind the saturation function instead of that on the resultant noisy observation. Finally, the proposed method is experimentally confirmed too by applying it to the actual problem for a reverberation time measurement from saturated noisy observations in room acoustics - M OHTA; N NAKASAKO; K HATAKEYAMAIEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E75A (11) 1460 - 1467 0916-8508 1992/11 [Refereed]
This paper describes a new trial of dynamical parameter estimation for the actual room acoustic system, in a practical case when the input excitation is polluted by a background noise in contrast with the usual case when the output observation is polluted. The room acoustic system is first formulated as a discrete time model, by taking into consideration the original standpoint defining the system parameter and the existence of the background noise polluting the input excitation. Then, the recurrence estimation algorithm on a reverberation time of room is dynamically derived from Bayesian viewpoint (based on the statistical information of background noise and instantaneously observed data), which is applicable to the actual situation with the non-Gaussian type sound fluctuation, the non-linear observation, and the input background noise. Finally, the theoretical result is experimentally confirmed by applying it to the actual estimation problem of a reverberation time. - Mitsuo Ohta; Shigeharu Miyata; Noboru NakasakoJournal of the Acoustical Society of Japan (E) 13 (2) 101 - 113 0388-2861 1992 [Refereed]
In the ultrasound diagnosis field, an analysis of speckle image texture in ultrasound B-scans is one of the important researches using stochastic signal processing method. In this paper, it is focused on finding out theoretically the probability density function of the speckle image texture for the magnitude of speckle image. First, the occurrence mechanism of speckle image texture is treated as a random walk problem in a multi-dimensional signal space based on Shannon's sampling theorem, by newly introducing a Hankel transformation type characteristic function. As a result, a unified probability density function expression has been explicitly proposed and it has been clarified that the present expression agrees with the well-known Rayleigh and Rician probability density functions as two special cases. Then, the legitimacy and the effectiveness of proposed stochastic analysis method has been experimentally confirmed by applying it to the speckle pattern of clinical B-scan image actually utilized for diagnostic purpose. © 1992, Acoustical Society of Japan. All rights reserved. - Mitsuo Ohta; Noboru Nakasako; Kazutatsu HatakeyamaTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 47 (9) 639 - 646 0369-4232 1991/09 [Refereed]
前報告では、刻々の残響過程においてエネルギーの統計的な揺らぎ形態が特に個々のモーメント情報に中心をおいて時間と共にいかに推移してゆくかを考察した。前報告とは異なり、本報告ではまず、計測の実際と現実の揺らぎの複雑さに対応できる離散型の一般化Fokker-Planck方程式を導出し、残響室における残響曲線の揺らぎ分布全体に関する過渡的推移表現をSabineの残響則を反映した逐次形式の形で新たに導出する。具体化にあたっては、エネルギー変量における物理的対策の足場と評価におけるdB観測に整合できるよう、この確率分布の推移法則における初期分布の枠組として、特に対数正規分布を初項に持つ一般的な展開分布表示を採用している。最後に、残響室内における実測例に適用して本手法の有効性を実験的にも検証している。 - M OHTA; N NAKASAKO; K HATAKEYAMAACUSTICA S HIRZEL VERLAG 74 (4) 242 - 253 0001-7884 1991/09 [Refereed]
This paper discusses several types of the mutual correlation of information among stochastic fluctuations of the sound intensity at three observation points on the basis of a tri-variate joint probability distribution. First of all, the statistical Laguerre series expansion expression, taking the product of three Gamma distributions as its first term, and reflecting the linear and nonlinear correlations of fluctuations in each expansion coefficient, is introduced as the general framework of the tri-variate joint probability distribution. Needless to say, the Gamma distribution corresponds to a well-known probability distribution at a single observation point. Next, each expansion coefficient is derived in relation to the geometrical positions of the observation points, the frequency characteristics of the input, the time constant of the sound level meter, and so on. Finally, the validity of the proposed theory is experimentally confirmed by applying it to data actually observed at three points in a reverberation room. - Mitsuo Ohta; Noboru Nakasako; Yasu SatoTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 47 (8) 545 - 553 0369-4232 1991/08 [Refereed]
任意周波数帯域幅の白色雑音入力を、拡散音場下の室に加えたとき、その不規則応答波が、任意K個の観測点において時間・空間的にどのような揺らぎ相関を持つか、その確率特性について理論的に考察する。具体的には、まずこれらの各種相関情報をすべて洩れなく導出できる任意多変量結合確率分布表示を一般表現の形で導出する。特に、2変量、3変量、4変量の場合について詳細に考察を行った。また、線形・非線形の各種相関情報を浮き彫りにするため、結合モーメント、条件付確率密度関数、条件付モーメントについての考察も行う。最後に、実際に残響室内において実験を行い、理論的に予測された曲線と実測値とを比較検討し、理論の有効性をも確認した。 - M OHTA; N NAKASAKOACUSTICA S HIRZEL VERLAG 74 (1) 23 - 40 0001-7884 1991/06 [Refereed]
This paper, which is dedicated to Dr. M. Jessel in celebration of his 70th birthday, gives an exact expression for the stochastic problem of N-dimensional random walks on the basis of information theory in close connection with room acoustics. The probability density function is derived for the sum of independent and isotropic random vectors in an N-dimensional signal space, when the magnitude is independent of the direction. First, a characteristics function of the Hankel transform type is newly introduced, because it is suitable for consideration of the probability problem of N-dimensional random walks, and can be used to derive an exact representation of the probability density function. Then, the probability density function is explicitly derived for the random fluctuation of a power scaled variable (or effective value) with a mean squaring function (for instance, the sound or vibration energy fluctuation observed via a sound level meter or sound vibration meter). Finally, the validity and effectiveness of the proposed theory is experimentally confirmed by the use of a digital simulation technique, and is discussed particularly in connection with room acoustics. - Mitsuo Ohta; Noboru Nakasako; Kazumasa NakamuraTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 47 (1) 13 - 20 0369-4232 1991/01 [Refereed]
前報告では、メモリある音・振動環境システムの簡便な1変量出力応答分布がメモリ効果とゼロメモリ型非線形効果を機能的に分離し近似表現ではあるが両者を反映した統一的形態で導出された。特にエネルギー変量のみに着目した前報告とは異なり、本報告ではまず、エネルギースケールにおける物理変量に足場を置きながらもdBスケールでの観測データへも整合できる揺らぎ分布表現の一般的枠組みとして、対数正規分布を表現の基幹にとり、更に揺らぎの多様さへ互いに冗長度なきよう階層的に対処できる直交展開型分布表現を新たに導入した。本手法の有効性は、ロック音楽と交通騒音の侵入した室内音響における実問題へ適用して実験的にも確認された。 - M OHTA; N NAKASAKOACUSTICA S HIRZEL VERLAG 71 (2) 121 - 126 0001-7884 1990/06 [Refereed]
- M. 0hta; N. Nakasako; Y. XiaoArchives of Acoustics 15 (3-4) 399 - 416 1990/04 [Refereed]
- M OHTA; N NAKASAKO; K KITOHACUSTICA S HIRZEL VERLAG 70 (4) 292 - 296 0001-7884 1990/04 [Refereed]
- Mitsuo Ohta; Noboru Nakasako; Kazumasa NakamuraTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 45 (4) 255 - 262 0369-4232 1989/04 [Refereed]
任意帯域幅の白色雑音を入力した拡散音場下の2観測点間で、音の強さに関する互いの揺らぎが持つ空間相関と各観測点で個々に示す揺らぎ分布の間の関連性についてまず理論的に考察する。両者を関連付けた揺らぎの結合分布が、入力の任意周波数帯域幅と計器の自乗機能や任意時定数の影響を具体的に反映させた2変量統計的Laguerre展開型の分布表示として導出される。この表示を基盤にして2観測点間の相関効果を考察するとき、低次から高次へ線形相関のべき級数の形で階層的に個々に調査する分析的立場と、条件付き確率密度の分布関数全体に着目する総合的立場の、対照的な二つの見地をとる。最後に、残響室内の実測データに本理論を適用してその有効性を実験的にも検証する。 - A background noise correction method based on the dynamical state estimation algorithm for the actually observed data with arbitrary amplitude constraintN. Nakasako; M; hta, B; SoenarkoSingapore Journal of Physics 6 (1) 137 - 144 1989/04 [Refereed]
- Mitsuo Ohta; Noboru NakasakoElectronics and Communications in Japan (Part III: Fundamental Electronic Science) 72 (12) 1 - 12 1520-6440 1989 [Refereed]
Fluctuations at two observation points in a diffused sound field vary with correlations. In actual acoustic measurements, a sound level meter with a time constant is often used for a white noise input with a frequency bandwidth. Hence, fluctuations of the sound intensity must be considered first. Numerous studies have been reported on the probability density function and the spatial correlation in a diffuse sound field. How‐ever, the former is limited to a single variate distribution while the latter is restricted to the linear correlation of fluctuations. In this paper, the joint probability distribution of the fluctuations of the sound intensity is derived first so that various linear and nonlinear correlation effects between the fluctuations at two observation points are found in connection with the well‐known T‐type probability distribution at in dividual observation point. the resultant distribution expression is a two‐variate joint T distribution for which the arbitrary frequency bandwidth of the input and the effects of square function and arbitrary time constant of the measurement device are reflected structurally in each statistical parameter. Further, to distinguish all correlations between fluctuations at the two observation points A and B, the conditional probability density function on the fluctuation at the point A is derived in the case where a conditioned level is set at the point B. Finally, the present method is applied to the fluctuation data of sound measured in a reverberant room so that the actual usefulness is confirmed. Copyright © 1989 Wiley Periodicals, Inc., A Wiley Company - M OHTA; K HATAKEYAMA; A IKUTAJOURNAL OF SOUND AND VIBRATION ACADEMIC PRESS LTD 127 (2) 253 - 270 0022-460X 1988/12 [Refereed]
- Mitsuo OHTA; Noboru NAKASAKOIEICE Trans. Fundamentals(Japanese Edition) 電子情報通信学会基礎・境界ソサイエティ J71-A (11) 1999 - 2008 0913-5707 1988/11 [Refereed]
- Mitsuo Ohta; Naomitsu Takaki; Noboru NakasakoThe Jounal of the INCE (Institute of Noise Control Engineers) of Japan The Institute of Noise Control Engineering of Japan 12 (1) 35 - 40 0386-8761 1988/02 [Refereed]
- Mitsuo Ohta; Akira Ikuta; Noboru NakasakoTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 43 (11) 837 - 844 0369-4232 1987/11 [Refereed]
- M OHTA; Y FUJITA; N NAKASAKO; B ZHANGACUSTICA S HIRZEL VERLAG 63 (3) 191 - 202 0001-7884 1987/05 [Refereed]
- N NAKASAKO; M OHTA; S KUWAHARAAPPLIED ACOUSTICS ELSEVIER SCI LTD 22 (2) 103 - 115 0003-682X 1987 [Refereed]
- A dynamical state estimation method based on the non-linear mixed stochastic model in room acousticsM. Ohta; N. Nakasako; K. HatakeyamaACUSTICA 62 (2) 123 - 130 1986/11 [Refereed]
- Mitsuo OHTA; Noboru NAKASAKOTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 42 (2) 102 - 112 0369-4232 1986/02 [Refereed]
- Mitsuo Ohta; Noboru NakasakoJournal of the Acoustical Society of Japan (E) 7 (6) 335 - 342 0388-2861 1986 [Refereed]
In the practical engineering field of noise control, it is as important as the sound source countermeasure to improve the sound propagation characteristics by newly setting a sound insulation system. On the other hand, the noise statistics like an Lx (x=5, 10, 50, 90, …) defined as a (100—x) percentage point of the sound level distribution are very important as well as the lower order energy moment statistics like an Leqin the actual noise evaluation and regulation problems. In this paper, two kinds of probabilistic evaluation methods for sound insulation systems are theoretically proposed from typically different points of view for the probability distribution of the transmitted sound intensity, when a general stationary random noise having an arbitrary distribution form and frequency characteristics is insulated by a wall. To evaluate its sound transmission coefficient, a somewhat modified statistical energy analysis method has been used. The validity of the theoretical results is experimentally confirmed by applying it to the actually observed data on the output response fluctuation of single and double walls type insulation systems inserted between two reverberation rooms. © 1986, Acoustical Society of Japan. All rights reserved. - Mitsuo Ohta; Hiroshi Yamada; Noboru NakasakoTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 41 (4) 221 - 229 0369-4232 1985/04 [Refereed]
The additive model with external fluctuation factors and the multiplicative model with internal fluctuation factors are well-known as two fundamental models describing the stationary and non-stationary random phenomena in the actual engineering field. An actual stochastic systems described by an additive model in a short time interval must be very often described in a long time interval by a mixed type stochastic model containing the fluctuation of multiplicative factor, because the internal parameter of the system changes with the passage of time. In this paper, first, by introducing a mixed type stochastic model for the actual random process, a unified expression is proposed for the probability distribution function of the above non-stationary composite wave measured by an arbitrary non-linear observation system. Next, by use of the above theory, two types of new methods identifying the probability distribution function of a specific factor embedded in the composite wave are derived in a general form of series expansion expression. Finally, by applying the above theoretical results to various types of L_<eq> evaluation problems of road traffic noises and industry noises based on the actual noise observations corrupted by the background noise, the validity of proposed evaluation methods is also experimentally confirmed. - Mitsuo OHTA; Noboru NAKASAKOTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 41 (1) 13 - 20 0369-4232 1985/01 [Refereed]
In general, the descriptive approach on the stochastic evaluation is typically effective for the complicated situation of actual sound insulation systems with an actual random noise excitation which is impossible to evaluate by use of the well-known structual approach. In this paper, after once introducing descriptively a linear regression type system model between input and output, the system parameters have been estimated not in a sense of the usual least square error evaluation but in a sense of laying stress on the edge or the whole shape of probability distribution function. More concretely, this estimation method has been originally proposed by use of a stochastic approximation method for the purpose of extracting more effective information latent in the remainder fluctuation around the above linear regression, under a new error criterion based on equalizing a noise evaluation index L_aα and a Kullbacks information quantity for modelled and actual systems. Furthermore, in an actual case with an existence of background noise, a simplified trial of removing this background noise is also discussed. Finally, the effectiveness of the proposed evaluation methods has been experimentally confirmed too by applying it to the actually complicated sound environmental system. - Mitsuo Ohta; Noboru NakasakoJournal of the Acoustical Society of Japan (E) 6 (2) 127 - 134 0388-2861 1985 [Refereed]
Until now, the output probability distribution prediction for the sound insulation system was investigated by many researchers based on two contrastive structural and descriptive approaches especially from a methodological viewpoint. The descriptive method is certainly more suitable for the complicated stituation of actual sound insulation systems with an arbitrary distribution type random excitation. In this paper, especially by paying our attention to the effective information on the remainder fluctuation around the formally introduced linear regression, a simplified identification method for an arbitrary sound insulation system and then a simple prediction method for its output probability distribution have been proposed. More concretely, by introducing new types of linear and/or non-linear regression models between input and output fluctuations, their system parameters can be identified by use of the well-known least squares error method or its generalized error criterion. Furthermore, in an actual case with an existence of background noise, the effect and simple removal countermeasures of background noise are also discussed. The effectiveness of our identification and prediction methods is experimentally confirmed too by applying them to the actual living environment. © 1985, Acoustical Society of Japan. All rights reserved. - M OHTA; K NAKAMURA; N NAKASAKOACUSTICA S HIRZEL VERLAG 58 (1) 39 - 47 0001-7884 1985 [Refereed]
- Mitsuo Ohta; shoji Oki; Noboru NakasakoTHE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN The Acoustical Society of Japan (ASJ) 40 (2) 87 - 94 0369-4232 1984/02 [Refereed]
As is well-known, the wave form of random noise and vibration appearing in our actual enviroment shows usually the variety and the complexity in its fluctuation pattern. The statistical methods of analyzing and evaluating the above random wave form were studied by many researchers, from the viewpoint of signal analysis. In this paper, after first setting a generalized method of statistically evaluating the acuity of fluctuating random wave based on the information on each order of differntial type state variables, especially for the stational random wave of arbitarary distribution type, a new trial toward the statistical evaluation on the locations of level crossing, peak and trough has been concretely considered as the special cases, in close connection with the above differential type state variables. That is, in the proposed theory, the effect of usual linear correlations and non-linear correlations among two and/or many sampled points of random wave on the above probability distribution form of level crossing, peak and trough has been fully discussed under introduction of multivariate joint probability distribution. Finally, the practical effectiveness of the present theory has been experimentally confirmed too by applying it to the acrual road traffic noise wave obeserved ina suburb of a large city. - M OHTA; S YAMAGUCHI; N NAKASAKOACUSTICA S HIRZEL VERLAG 56 (4) 270 - 279 0001-7884 1984 [Refereed]
- Mituo Ohta; Noboru Nakasako; Akira IkutaJournal of the Acoustical Society of Japan (E) 4 (4) 189 - 202 0388-2861 1983 [Refereed]
It is well-known that the level fluctuations appearing in the road traffic noise environment are brought on by various type causes and can be roughly classified into two great divisions on the road traffic flow pattern and the surrounding sound field. Accordingly, if the equivalent models for the above two divisions-traffic flow and its surrounding field are well established in a flexible form of reflecting the complex situation of actual road traffic noise field, it will be possible to predict precisely and/or to control effectively the road traffic noise. In this paper, from the above point of view, a stochastic model of road traffic noise with a generalized Poisson type flow is first introduced with many informations of actual situation. Next, an equivalent type sound propagation model is newly proposed in a form of mixing of two idealized sound propagation environments-a free sound field and a diffused sound field. Furthermore, a methodological trial to estimate the above equivalent sound propagation characteristics of the compound environment by measuring the actual road traffic noise data is derived from the system-theoretical point of view. In this case of estimation, the well-known stochastic approximation method is used in order to overcome the difficulty of non-Gaussian and non-linear characteristics existing in the actual environmental noise phenomena. Finally, the legitimacy of this estimation method is confirmed by applying it to the traffic noise data actually observed in a big city. PACS number: 43. 28. Fp, 43. 28. Hr, 43. 50. Lj, 43. 50. Vt, 43. 60. Cg. © 1983, Acoustical Society of Japan. All rights reserved.
MISC
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- Identification of sound source position or direction based on the statistical independency in an actual sound environment(Project No. : 13650472)中迫 昇; 小倉 久直 平成13年度~平成14年度科学研究費補助金基盤研究C.研究成果報告書 1 -65 2003/03
- NAKASAKO Noboru; HIGASHI Takeo; TAKAKUWA Yoshiaki Technical report of IEICE. EA 102- (606) 57 -62 2003/01
- NAKASAKO Noboru; OGURA Hisanao; SAKUMA Yuko Technical report of IEICE. EA 102- (483) 25 -30 2002/11
- ディジタル信号処理の最先端技術 コンピュータが音を聞き分ける?聞き耳を立てる?中迫 昇 近畿大学生物理工学部公開講座講演資料 7 -15 2002/08
- NAKASAKO Noboru; SAKAMOTO Koichi; ITOH Hitoshi; TAKAKUWA Yoshiaki 日本音響学会研究発表会講演論文集 2002- (1) 823 -824 2002/03
- OGURA Hisanao; NAKASAKO Noboru Technical report of IEICE. EA 101- (598) 1 -8 2002/01
- NAKASAKO Noboru; ITOH Hitoshi; TAKAKUWA Yoshiaki Technical report of IEICE. EA 101- (598) 9 -16 2002/01
- BME 16巻5号, pp.9-16- 2002
- NAKASAKO Noboru; SAKAMOTO Koichi; ITOH Hitoshi; TAKAKUWA Yoshiaki Technical report of IEICE. EA 101- (480) 39 -46 2001/11
- NAKASAKO Noboru; ITOH Hitoshi 日本音響学会研究発表会講演論文集 2001- (2) 619 -620 2001/10
- NAKASAKO Noboru; NAKAGAWA Shinichi 日本音響学会研究発表会講演論文集 2001- (1) 577 -578 2001/03
- NAKASAKO N.; OGURA H.; KURUUCHI H. Technical report of IEICE. EA 100- (580) 45 -52 2001/01
- 中迫昇 信学技報 US2001 -93 2001
- Noboru Nakasako; Mitsuo Ohta Acoustical Science and Technology 22- (5) 358 -363 2001
- MITANI Yasuo; WATANABE Eiji; NAKASAKO Noboru Technical report of IEICE. EA 100- (467) 41 -48 2000/11
- NAKASAKO Noboru; MINAMIO Katsuhiko センシングフォーラム資料 17- 13 -18 2000/10
- MITANI Yasuo; WATANABE Eiji; NAKASAKO Noboru 日本音響学会研究発表会講演論文集 2000- (2) 517 -518 2000/09
- NAKASAKO Noboru; MINAMIO Katsuhiko 日本音響学会研究発表会講演論文集 2000- (2) 379 -380 2000/09
- NAKASAKO Noboru 日本音響学会研究発表会講演論文集 2000- (2) 431 -434 2000/09
- OGURA H.; NAKASAKO N.; SEO N. Technical report of IEICE. DSP 99- (695) 31 -36 2000/03
- MITANI Yasuo; WATANABE Eiji; NAKASAKO Noboru 日本音響学会研究発表会講演論文集 2000- (1) 487 -488 2000/03
- NAKASAKO Noburu; MINAMIO Katsuhiko 日本音響学会研究発表会講演論文集 2000- (1) 563 -564 2000/03
- NAKASAKO Noboru; OGURA Hisanao; TAKEMOTO Yasuhiro Technical report of IEICE. EA 99- (590) 17 -24 2000/01
- OGURA H.; NAKASAKO N.; SEO N. Technical report of IEICE. EA 99- (590) 25 -32 2000/01
- Noboru Nakasako; Hisanao Ogura; Mitsuo Ohta Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 21- (1) 49 -52 2000
- MITANI Yasuo; WATANABE Eiji; NAKASAKO Noboru Technical report of IEICE. EA 99- (435) 55 -60 1999/11
- NAKASAKO Noboru; MINAMIO Katsuhiko Technical report of IEICE. EA 99- (434) 1 -8 1999/11
- MITANI Yasuo; WATANABE Eiji; NAKASAKO Noboru センシングフォーラム資料 16- 15 -20 1999/10
- NAKASAKO Noboru センシングフォーラム資料 16- 21 -26 1999/10
- NAKASAKO Noboru; OGURA Hisanao; TSURUTA Kohsuke 日本音響学会研究発表会講演論文集 1999- (2) 515 -516 1999/09
- OGURA H.; NAKASAKO N.; SEO N. Technical report of IEICE. DSP 99- (97) 37 -44 1999/05
- NAKASAKO Noboru; OGURA Hisanao Technical report of IEICE. EA 98- (531) 1 -8 1999/01
- OGURA H.; NAKASAKO N.; SEO N. Technical report of IEICE. EA 98- (531) 9 -16 1999/01
- NAKASAKO N. Proc.of Spring Meet.Acoust.Soc.Jpn. 1- 537 -538 1999
- NAKASAKO Noboru; OGURA Hisanao Technical report of IEICE. EA 98- (390) 1 -6 1998/11
- NAKASAKO Noboru; NAKATANI Masato; OHTA Mitsuo Proceedings of the Meeting,the Institute of Noise Control Engineering of Japan 1998- 55 -58 1998/09
- MITANI Yasuo; OHTA Mitsuo; NAKASAKO Noboru 日本音響学会研究発表会講演論文集 1998- (2) 573 -574 1998/09
- NAKASAKO Noboru; NAKATANI Masato; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1998- (2) 571 -572 1998/09
- Nakasako Noboru; Nakatani Masato; Ohta Mitsuo Proceedings of the IEICE General Conference 1998- 456 -457 1998/03
- NAKASAKO N.; NAKATANI M.; OHTA M. 日本音響学会研究発表会講演論文集 1998- (1) 565 -566 1998/03
- NAKASAKO Noboru; NAKATANI Masato; OHTA Mitsuo Technical report of IEICE. EA 97- (515) 79 -86 1998/01
- Noboru Nakasako; Yasuo Mitani; Mitsuo Ohta Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 19- (6) 391 -396 1998
- M Ohta; Y Mitani; N Nakasako JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 12- (5) 677 -699 1998
- Noboru Nakasako; Mitsuo Ohta Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 19- (2) 113 -120 1998
- NAKASAKO Noboru; MITANI Yasuo; OHTA Mitsuo Technical report of IEICE. EA 97- (405) 15 -22 1997/11
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo 日本騒音制御工学会技術発表会講演論文集 1997- 269 -272 1997/09
- NAKASAKO N.; MITANI Y.; OHTA M. 日本音響学会研究発表会講演論文集 1997- (2) 561 -562 1997/09
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1997- (2) 565 -566 1997/09
- N Nakasako; M Ohta; Y Mitani IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A- (8) 1410 -1416 1997/08
- E Watanabe; N Nakasako; Y Mitani IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A- (6) 971 -976 1997/06
- A Ikuta; M Ohta; N Nakasako IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A- (5) 825 -832 1997/05
- Nakasako Noboru; Mitani Yasuo; Ohta Mitsuo Proceedings of the IEICE General Conference 1997- 265 -265 1997/03
- NAKASAKO N.; OHTA M.; MITANI Y. 日本音響学会研究発表会講演論文集 1997- (1) 485 -486 1997/03
- Yasuo Mitani; Noboru Nakasako; Mitsuo Ohta Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 18- (4) 183 -190 1997
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo Technical report of IEICE. EA 96- (437) 9 -14 1996/12
- Ikuta Akira; Ohta Mitsuo; Nakasako Noboru Proceedings of the Society Conference of IEICE 1996- 310 -311 1996/09
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo 日本騒音制御工学会技術発表会講演論文集 1996- 347 -350 1996/09
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1996- (2) 559 -560 1996/09
- N Nakasako; M Ohta IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A- (8) 1252 -1255 1996/08
- Ohta Mitsuo; Mitani Yasuo; Nakasako Noboru IEICE technical report. Electromagnetic compatibility 96- (163) 75 -82 1996/07
- MITANI Yasuo; NAKASAKO Noboru; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1996- (1) 595 -596 1996/03
- NAKASAKO Noboru; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1996- (1) 599 -600 1996/03
- A Digital Filter of Restoring the Stochastic Signal Processing from Noisy and Quantized Level ObservationsTrans.IEICE A J79-A- (5) 1013 1996
- Noboru Nakasako; Mitsuo Ohta Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi) 17- (1) 27 -32 1996
- MITANI Y; NAKASAKO N; OHTA M 日本騒音制御工学会技術発表会講演論文集 1995- 225 -228 1995/09
- NAKASAKO Noboru; OHTA Mitsuo 日本音響学会研究発表会講演論文集 1995- (2) 505 -506 1995/09
- MITANI Y; NAKASAKO N; OHTA M 日本音響学会研究発表会講演論文集 1995- (2) 597 -598 1995/09
- 中迫昇 音講論集 2- 519 -520 1995
- Nakasako Noboru; Ohta Mitsuo; Yoshino Nobuyuki Technical report of IEICE. EA 94- (323) 9 -16 1994/11
- N NAKASAKO; M OHTA; H OGAWA IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E77A- (8) 1353 -1362 1994/08
- Nakasako Noboru; Ohta Mitsuo; Hirata Masayuki Technical report of IEICE. EA 93- (346) 51 -58 1993/11
- N NAKASAKO; M OHTA; Y MITANI IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E76A- (9) 1392 -1402 1993/09
- 太田 光雄; 中迫 昇; 山口 静馬 広島大学工学部研究報告 32- (1) p15 -23 1983/11
Books and other publications
- 持ちつ持たれつ生き物とコンピュータ吉川 昭; 中迫 昇; 山脇 伸行; 吉田 久; 長江 貞彦; 小濱 剛; 奥井 順; 辻合 秀一 (Joint work副編集長として参画するとともに,第3章「聖徳太子風コンピュータ」を執筆)電気書院 2006/08
- 持ちつ持たれつ 生き物とエレクトロニクス本津茂樹他 (Joint editorpp.1-146(副編集長として編集に参画))電気書院 2006/08
- スペクトル解析ハンドブック日野 幹雄; 中迫 昇; 吉川 昭; 他多数 (Joint work)朝倉書店 2004/02スペクトル解析に関係する専門技術について、ハンドブックの一部を執筆した。内容は、脳波解析であり、「コンピュータの進歩と脳波解析」、「脳波の時間-周波数解析」、「独立成分分析」 に関し、それらの原理を説明するとともに、我々が行った脳波解析の結果も示した。
- 改訂 電子情報通信用語辞典(電子情報通信学会編)著者多数 (Joint workChap.5, p.33, 72, 137, 148, 150, 151, 154, 156, 223-224, 250, 406, 534, 641, 708, 890-891, 921-922, 1011)コロナ社 1999
- IEICE Dictionary of Electronics, Information and Communication Terms1999
- エンサイクロペディア 電子情報通信ハンドブック著者多数 (Contributorp.304~p.305)オーム社 1998
- Encyclopedia Electronics, Information and Communication Handbook1998
- Higher-order Statistical Signal PocessingE. Uchino; M. 0hta; H. Minamihara; N. Nakasako; B; Boashash; E. J. Powers; A. M. Zoubir (ContributorChap. 5, pp.151-177)Longman, Melbourne 1995/07
- Higher-Order Statistical Signal Processing (jointly worked)(Edited by B.Boashash,E.J.Powers&A.M.Zoubin)Longman,Wiley 1995
Lectures, oral presentations, etc.
- 骨伝導音を用いた LMS 法による空気伝導音の雑音除去と音質改善の検討 [Not invited]竹内 彩華; 折本 寿子; 生田 顕; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2024年秋季研究発表会 2024/09
- 位相干渉を用いた音響測距に基づく位置・概形イメージングの基礎的検討 [Not invited]田邉 広大; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2024年春季研究発表会 2024/03
- 超音波画像を用いたしじみの良否判別の可能性 [Not invited]古川 尚幸; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2024年春季研究発表会 2024/03
- 骨伝導音を用いた雑音下の空気伝導音の雑音除去と骨伝導音の音質改善の基礎的検討 [Not invited]竹内 彩華; 上保 徹志; 中山 雅人; 折本 寿子; 生田 顕; 中迫 昇日本音響学会2024年春季研究発表会 2024/03
- 発話者と反射板間の多重反射を用いた発話者までの距離推定に関する基礎検討 ―インパルス音を用いた予備的試行― [Not invited]大橋 勇介; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2024年春季研究発表会 2024/03
- 音源・反射板間で生じる多重反射を用いた音源推定に関する検討 -距離スペクトルにおける対象距離外のピークについて- [Not invited]大橋 勇介; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2023年春季研究発表会 2023/03
- 定在波に基づく可聴音を用いた対象物までの音響測距法(距離測定の原理から音源距離推定までの進展 [Invited]中迫 昇; 上保 徹志; 篠原 寿広; 中山 雅人電子情報通信学会応用音響研究会 2022/12
- 音源と反射板間の多重反射を用いた音響測距による音源から反射板までの距離推定に関する指向性の検討 [Not invited]大橋勇介; 上保徹志; 中山雅人; 中迫昇令和4年 電気関係学会関西連合大会 2022/11
- 音源と反射板間の多重反射に対する近接 2ch 観測を用いた音源推定の試み [Not invited]大橋 勇介; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2022年秋季研究発表会 2022/09
- 音響測距法における距離スペクトルピークの回帰分析に基づく物体の大きさ推定の検討 [Not invited]中山 雅人; 川那邊 結也; 上保 徹志; 中迫 昇日本音響学会2022年秋季研究発表会 2022/09
- 可聴音による測距実験環境の最小構成の提案 (音響センシングを在宅で実現するための試み) [Not invited]和泉 響; 上保徹志; 中迫 昇令和3年 電気関係学会関西連合大会 2021/12
- 環境雑音下の近接2ch観測信号に対するマスク処理を用いた音響測距法山門 樹; 篠原寿広; 上保徹志; 中迫 昇令和3年 電気関係学会関西連合大会 2021/12
- 衝突音の時間周波数特性を用いた機械学習に基づくシジミ選別の試み [Not invited]堀口 遼太郎; 上保 徹志; 中山 雅人; 中迫 昇第65回システム制御情報学会研究発表講演会 2021/05
- 定在波に基づく音響測距法 〜可聴音を用いた対象物までの距離測定の原理と進展〜 [Invited]中迫 昇; 篠原 寿広; 上保 徹志第65回システム制御情報学会研究発表講演会 2021/05
- マスク処理による音響測距に生じる偽ピークの除去 [Not invited]山門 樹; 篠原寿広; 上保徹志; 中迫 昇2021年電子情報通信学会総合大会 2021/03
- クロススペクトル法を用いた 音響測距における環境雑音の影響の基礎的検討(2chの各雑音間に相関がある場合) [Not invited]山門 樹; 篠原寿広; 上保徹志; 中迫 昇令和2年 電気関係学会関西連合大会 2020/11
- 近接 2ch 観測間のクロススペクトル法を用いた音響測距における環境雑音の影響の基礎的検討 [Not invited]山門 樹; 上保 徹志; 篠原 寿広; 中迫 昇日本音響学会2020年秋季研究発表会 2020年9月11日 2020/09
- 衝突音のパワースペクトルを用いたシジミの良否判別の試み [Not invited]堀口 遼太郎; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2020年秋季研究発表会 2020/09
- Distance Measurementby Independent Component Analysis and Autocorrelation FunctionUsing Adjacent 2ch Microphones under High Noise [Not invited]Noboru Nakasako; Yusuke Nakaoka; Toshihiro Shinohara; Tetsuji Uebo第64回システム制御情報学会研究発表講演会 2020/05
- 機械学習を用いた腰部に対する超音波画像装置のプローブの当て方の良否自動判別方法の検討(発表会自体はコロナウィルス感染拡大防止のため中止)石田康一郎, 篠原寿広, 上保徹志2020年電子情報通信学会総合大会 2020/03
- 位相干渉に基づく距離推定法による周期的移動物体の周期検出の試みと幾何学的配置の推定距離への影響(発表会自体はコロナウィルス感染拡大防止のため中止)中迫 昇, 湊 旬紀, 中川秀夫, 篠原寿広, 上保徹志2020年電子情報通信学会総合大会 2020年3月20日 2020/03
- 2ch マイクロホンを用いた対象物までの距離推定 -音源とマイクロホンでできる線分に対して垂直方向に対象物を設置した場合-(発表会自体はコロナウィルス感染拡大防止のため中止)田井 一, 上保 徹志, 篠原 寿広, 中迫 昇日本音響学会2020年春季研究発表会 2020/03
- パラメトリックスピーカとビームステアリングを用いた音響測距(発表会自体はコロナウィルス感染拡大防止のため中止) [Not invited]北野 翔子, 篠原 寿広, 上保 徹志, 中迫 昇日本音響学会2020年春季研究発表会 2020/03
- 広帯域スピーカによる実および擬似観測信号間のクロススペクトル法を用いた位相干渉に基づく1ch音響測距法 [Not invited]北野翔子; 篠原寿広; 上保徹志; 中迫昇R01電気関係学会関西連合大会 2019/11
- 近接3chマイクロホンを用いた環境雑音と測定系の影響に強い音響測距法 [Not invited]田井一; 篠原寿広; 上保徹志; 中迫昇R01電気関係学会関西連合大会 2019/11
- 広帯域スピーカによる超音波成分も利用した音響測距 [Not invited]北野 翔子; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2019年秋季研究発表会 2019/09
- 近接3chマイクロホンを用いた統計的独立性に基づく音響測距における測定系の影響除去の試み [Not invited]田井 一; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2019年秋季研究発表会 2019/09
- Distance measurement and its implementation for very close range using both power and phase spectra of observation sound [Not invited]NAKASAKO Noboru計測自動制御学会 第36回センシングフォーラム 2019/08
- Estimation of distance and velocity of moving targets based on phase interference using observed signals by two adjacent microphones [Not invited]N. Nakasako; N. Yamazaki; H. Nakagawa; T. Shinohara; T. Uebo第63回 システム制御情報学会研究発表講演会 2019/05
- 位相干渉に基づく音響測距法を用いた等速移動体の距離と速度の測定システムの試作 [Not invited]山﨑 夏樹; 中川 秀夫; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2019年春季研究発表会 2019/03
- 広帯域スピーカを用いた音響測距における距離分解能の向上 [Not invited]北野 翔子; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2019年春季研究発表会 2019/03
- 2ch 観測信号を用いた音響測距における統計的独立性に基づく雑音低減の試み -振幅一定・位相ランダムな送信波の採用- [Not invited]田井 一; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2019年春季研究発表会 2019/03
- 呼吸に伴う胸の動きの測定を目指した位相干渉に基づく距離推定法による周期的移動物体の周期検出の試み [Invited]山崎夏樹; 篠原寿広; 上保徹志; 中迫昇H30電気関係学会関西連合大会 2018/12
- 複素ICAを用いた環境雑音に強い音響測距法の基礎的検討(帯域インパルス送信波の場合) [Not invited]田井一; 篠原寿広; 上保徹志; 中迫昇H30電気関係学会関西連合大会 2018/12
- クロススペクトル法を用いた位相干渉に基づく距離推定法による周期的移動物体の周期検出 [Not invited]山﨑 夏樹; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2018年秋季研究発表会 2018/09
- 高雑音下の音響測距における統計的独立性に基づく雑音低減の基礎的検討 [Not invited]田井 一; 村田 真治; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2018年秋季研究発表会 2018/09
- Distance measurement based on the phase interference using adjacent 2 ch microphones under highly noisy environment (A trial of noise countermeasure by semi-blind signal processing) [Not invited]N. Nakasako; S. Murata; T. Shinohara; T. Uebo第62回 システム制御情報学会研究発表講演会 2018/05
- 衝突音を用いたシジミ貝の良否判別における周波数刻みの影響に関する一実験的考察 [Not invited]村田 真治; 篠原 寿広; 中迫 昇日本音響学会2018年春季研究発表会 2018/03
- 人までの距離測定を目指した定在波に基づく音響測距法の試作小型システムによる一実現 [Not invited]小池 脩平; 宋 晶隆; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2018年春季研究発表会 2018/03
- 指向性雑音下の音響測距における近接2ch 観測信号を用いた瞬時ICA による雑音除去と到達音到来方向の影響 [Not invited]仲岡 佑亮; 村田 真治; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2018年春季研究発表会 2018/03
- 粒子群最適化を用いた送信波と反射波の位相干渉に基づく1ch 音響測距法 [Not invited]宋 昌隆; 篠原寿広; 上保徹志; 中迫 昇電子情報通信学会応用音響研究会 2018/02
- 位相干渉に基づく距離推定法を用いた周期的移動物体に対する周期検出 [Not invited]山崎夏樹; 篠原寿広; 上保徹志; 中迫昇H29年電気関係学会関西連合大会 2017/11
- 音声を送信音源としたクロススペクトル法を用いた位相干渉に基づく2ch音響測距法の試作小型システムによる一実現 [Not invited]宋昌隆; 篠原寿広; 上保徹志; 中迫昇H29年電気関係学会関西連合大会 2017/11
- 音声および画像処理による基礎的コミュニケーション改善ソフト開発 -声の大きさが与える印象とJulius尤度の関係- [Not invited]小田亮平; 篠原寿広; 中迫昇H29年電気関係学会関西連合大会 2017/11
- 雑音下の近接2ch 観測信号の瞬時ICA による分離信号を用いた位相干渉に基づく1ch 音響測距法 [Not invited]村田 真治; 篠原 寿広; 中迫 昇日本音響学会2017年秋季研究発表会 2017/09
- リニアチャープを送信音とする2ch 観測信号のヒルベルト変換を用いた複数対象物に対する音響測距の検討 [Not invited]阪口 弘資; 本多 進哉; 篠原 寿広; 上保 徹志日本音響学会2017年秋季研究発表会 2017/09
- 実観測信号と疑似観測信号間のクロススペクトルを用いた1ch 音響測距法の試作システムによる一実現 [Not invited]宋 昌隆; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2017年秋季研究発表会 2017/09
- A noise countermeasure for acoustic distance method based on phase interference in actual sound field using Normalized Least Mean Square (NLMS) method (Estimation of distance and velocity for a target moving with constant velocity) [Not invited]Natsuki Yamazaki; Toshihiro Shinohara; Tetsuji Uebo; Noboru Nakasako計測自動制御学会 第34 回センシングフォーラム 2017/09
- Development of software to improve a basic communication skill by using voice and image processing [Not invited]Ryohei Oda; Toshihiro Shinohara; Noboru Nakasako計測自動制御学会 第34 回センシングフォーラム 2017/09
- A Consideration of Distance Resolution in Distance Measurement Method Based on Phase Interference Using Ultrasound [Not invited]Toshihiro Shinohara; Tomohiro Ito; Tetsuji Uebo; Noboru Nakasako計測自動制御学会 第34 回センシングフォーラム 2017/08
- Estimation of distance and velocity for a moving target with constant velocity using acoustic distance measurement method based on phase interference [Not invited]Noboru Nakasako; Natsuki Yamazaki; Toshihiro Shinohara; Tetsuji UeboThe 61st Annual Conference of the Institute of Systems, Control and Information Engineers 2017/05
- リニアチャープ音の2ch 観測信号のヒルベルト変換を用いた音響測距の検討 [Not invited]阪口 弘資; 本多 進哉; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2017年春季研究発表会講演論文集 2017/03
- パラメトリックスピーカを用いた位相干渉に基づく音響測距と音源提示の試み [Not invited]中野 智史; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2017年春季研究発表会講演論文集 2017/03
- 2ch 観測信号間のクロススペクトルを用いた位相干渉に基づく音響測距法の耐雑音性 -サウンドリフレクタを対象物とする測距- [Not invited]本多 進哉; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2017年春季研究発表会講演論文集 2017/03
- クロススペクトル法を用いた位相干渉に基づく2ch音響測距法の32ビット小型システムによる一実現 [Not invited]宋昌隆; 篠原寿広; 上保徹志; 中迫昇平成28年度電気関係学会関西連合大会 2016/11
- パラメトリックスピーカによる音情報の伝達と聴取者の位置推定を目指した超音波アレイの位相制御による位相干渉に基づく音響測距(人間の位置推定の試み) [Not invited]中野智史; 篠原寿広; 上保徹志; 中山雅人; 中迫昇平成28年度電気関係学会関西連合大会 2016/11
- 直交するリニアチャープを送信音とする2ch観測信号間のクロススペクトルを用いた音響測距における雑音対策の検討 [Not invited]阪口弘資; 篠原寿広; 上保徹志; 本多進哉; 中迫昇平成28年度電気関係学会関西連合大会 2016/11
- 音声を音源とした疑似および実観測信号間のクロススペクトルを用いた雑音環境下の音源距離推定 [Invited]本多進哉; 篠原寿広; 上保徹志; 中山雅人; 中迫昇平成28年度電気関係学会関西連合大会 2016/11
- 定在波に基づく0m から測定可能な2ch 音響測距法の32 ビットマイクロコンピュータによる一実装 [Not invited]宋 昌隆; 篠原寿広; 上保徹志; 中迫 昇電子情報通信学会応用音響研究会 2016/10
- permutation-free な独立成分分析と音声のスパース性を用いた信号分離の一試み [Not invited]村田 真治; 篠原 寿広; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2016/09
- 2ch 観測信号のクロススペクトルを用いた位相干渉に基づく音響測距 -サウンドリフレクタを対象物とする測距- [Not invited]本多 進哉; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2016/09
- Kinect v2 を用いた位相干渉に基づく音響測距の試み [Not invited]小田 亮平; 篠原 寿広; 上保 徹志; 阪口 弘資; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2016/09
- 32 ビットマイクロコンピュータを用いた定在波に基づく1ch 音響測距法の一実装 [Not invited]宋 昌隆; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2016/09
- パラメトリックスピーカの位相制御を用いた位相干渉に基づく人間までの距離推定の精度向上の試み [Not invited]中野 智史; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2016/09
- A trial of acoustical distance measurement based on phase interference using phase-steering at each channel of parametric loudspeaker to measure the distance to a human [Not invited]T. Nakano; T. Shinohara; T. Uebo; M. Nakayama; N. Nakasako第33回センシングフォーラム予稿集 pp.58-61 2016/09
- リニアチャープ音の2ch 観測信号間のクロススペクトルを用いた音響測距の基礎的検討 [Not invited]中迫 昇; 本多進哉; 上保徹志; 英慎平; 篠原寿広第60回システム制御情報学会研究発表講演会 2016/05
- パラメトリックスピーカの位相制御を用いた位相干渉に基づく音響測距の試み [Not invited]中野 智史; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2016年春季研究発表会講演論文集 2016/03
- 1ch マイクロホンの観測信号と疑似観測信号間のクロススペクトルを用いた環境雑音に頑健な音響測距法 [Not invited]本多 進哉; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2016年春季研究発表会講演論文集 2016/03
- 超音波の直接波と反射波の位相干渉に基づく音響測距法(位相スペクトルを用いた超近距離計測) [Not invited]中野智史; 中迫昇; 篠原寿広; 上保徹志平成27年度電気関係学 会関西連合大会講演論文集 2015/11
- 1chマイクロホンの観測信号と疑似観測信号間のクロススペクトルによる音源距離推定法とその実験的検討 [Not invited]本多進哉; 中迫昇; 篠原寿広; 上保徹志; 中山雅人平成27年度電気関係学 会関西連合大会講演論文集 2015/11
- permutation-free な独立成分分析と音声のスパース性を用いた信号分離の一試み [Not invited]村田 真治; 篠原 寿広; 上保 徹志; 中迫 昇日本音響学会2016年秋季研究発表会講演論文集 2015/09
- 観測信号と疑似観測信号間のクロススペクトルを用いた位相干渉に基づく音源までの距離推定 [Not invited]中迫 昇; 秦 弥那; 篠原 寿広; 中山 雅人; 上保 徹志第32回センシングフォーラム 2015/09
- クロススペクトル法を用いた近接 2ch 観測下での音響測距における環境雑音の影響と除去の試み [Not invited]本多進哉; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2015年秋季研究発表会講演論文集 2015/09
- 超音波を用いた位相干渉に基づく音響測距の試み [Not invited]中野智史; 篠原 寿広; 上保 徹志; 中山 雅人; 中迫 昇日本音響学会2015年秋季研究発表会講演論文集 2015/09
- リニアチャープ音の干渉を用いた等速移動体の距離と速度の実用的推定法 [Not invited]中迫昇; 英慎平; 中山雅人; 篠原寿広; 上保徹志第59回システム制御情報学会研究発表講演会 (SCI’15) 2015/05
- 移動平均を用いたクロススペクトルの位相干渉に基づく音響測距法 [Not invited]鈴木 和博; 中迫 昇; 中山 雅人; 篠原 寿広; 上保 徹志日本音響学会2015年春季研究発表会 2015/03
- 位相干渉と直流成 分の除去に基づく0mから計測可能な2ch音響測距法 [Not invited]鈴木 和博; 中迫 昇; 中山 雅人; 篠原 寿広; 上保 徹志平成26年度電気関係学 会関西連合大会講演論文集 2014/11
- 解析信号の導入に よる超近距離計測可能な位相干渉に基づく2ch 音響測距法の検討 [Not invited]鈴木 和博; 中迫 昇; 中山 雅人; 篠原 寿広; 上保 徹志2014年秋季 研究発表会講演論文集 2014/09
- 解析信号導入による超 近距離測定可能な位相干渉に基づく1ch 音響測距法の小型システムへの一実 装 [Not invited]中迫昇; 藤井裕雅; 篠原寿広; 中山雅人; 上保徹志第58回システム制御情報学会研究発表講演会 (SCI’14) 2014/05
- Effect of the additional noise and the noise reduction method for the acoustic distance measurement method based on phase interference using cross spectrum in a noisy environment [Not invited]SUZUKI Kazuhiro2014年日本音響学会春季研究発表会 2014/03
- A trial on calculating the equivalent reflection coefficient by acoustic distance measurement method based on phase interference in actual field [Not invited]NEKI Yuma2014年日本音響学会春季研究発表会 2014/03
- A study on superimposition mode of mastication EMG on EEG, and its trial separation on FDICA [Not invited]富永 滋; 中迫 昇; 吉田 久電子情報通信学会 MEとバイオサイバネティックス研究会(MBE) 2013/12 岐阜市 電子情報通信学会 MEとバイオサイバネティックス研究会(MBE)
- 位相干渉に基づく1ch音響測距法における送受信系の移動を考慮したバックグラウンド除去 ~ 基礎的検討とロボットセンサーへの応用 ~ [Not invited]中迫 昇; 篠原 寿広; 西前 達矢; 中山 雅人; 上保 徹志電子情報通信学会応用音響研究会 2013/12 石川県金沢市 電子情報通信学会応用音響研究会
- リニアチャープ音の干渉に基づく音響測距法 -雑音環境下における基礎的検討- [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志平成25年電気関係学会関西支部連合大会 2013/12 寝屋川市 平成25年電気関係学会関西支部連合大会
- クロススペクトル法を用いた位相干渉に基づく音響測距における観測雑音の影響と一対策 [Not invited]鈴木 和博; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志; 福島 学平成25年電気関係学会関西支部連合大会 2013/12 寝屋川市 平成25年電気関係学会関西支部連合大会
- 送受信系の移動を考慮した位相干渉に基づく1ch 音響測距法とハンドロボットへの応用 [Not invited]西前 達矢; 中迫 昇; 篠原 寿広; 山脇 伸行; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/09 愛知県豊橋市 日本音響学会研究発表会
- 複数音源を利用したクロススペクトルの位相干渉に基づく対象物位置推定法の検討 [Not invited]鈴木 和博; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志; 福島 学日本音響学会研究発表会 2013/09 愛知県豊橋市 日本音響学会研究発表会
- 1ch 観測信号と疑似観測信号のクロススペクトルを利用した音響測距法の検討 [Not invited]根木 佑真; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/09 愛知県豊橋市 日本音響学会研究発表会
- A study on EEG lead systems, artifacts mixed into the EEGs when eating, and their classification methods based on ICA [Not invited]富永 滋; 中迫 昇; 吉田 久電子情報通信学会 MEとバイオサイバネティックス研究会(MBE) 2013/09 新潟市 電子情報通信学会 MEとバイオサイバネティックス研究会(MBE)
- A Study of Visualization system of Three-dimensional Image for Diagnostic Assistance of Cerebrovascular Diseases with Head-mounted Display Considering Head Position of Operator [Not invited]篠原 寿広; 中迫 昇; 池崎 健太; 中山 雅人第32回日本医用画像工学会大会 2013/08 産業技術総合研究所臨海副都心センター 第32回日本医用画像工学会大会
- Fudndamental consideration on 1ch acoustic distance measurement method based on phase interference by considering the movement of transmitting and receiving system [Not invited]中迫 昇; 篠原 寿広; 西前 達矢; 中山 雅人; 上保 徹志第57回システム制御情報学会研究発表講演会 2013/05 京都市南区 第57回システム制御情報学会研究発表講演会
- 位相干渉に基づく音響距離推定手法における微振動検出の理論的検討 [Not invited]河納 準一; 中迫 昇; 近藤 善隆; 稲毛 貴幸; 福島 学; 松本 光雄; 中山 雅人; 柳川 博文日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- インパルス応答を用いた距離推定における推定精度の検討 [Not invited]近藤 善隆; 中迫 昇; 河納 準一; 稲毛 貴幸; 福島 学; 松本 光雄; 中山 雅人; 柳川 博文日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- 左右に設置したパラメトリックスピーカを利用した音響測距に基づく立体音場再現手法の定位感に関する検討 [Not invited]廣畑 和紀; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- 雑音環境下における雑音抑圧と情報提示音声の位相干渉に基づく音響測距法の検討 [Not invited]根木 佑真; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- クロススペクトル法を用いた位相干渉に基づく音響測距法による対象物位置推定の基礎的検討 [Not invited]鈴木 和博; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志; 近藤 善隆; 福島 学日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- 対象物と送受音器の移動下におけるリニアチャープ音の干渉に基づく速度と距離の推定法 -様々な移動方向に関する基礎的検討- [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- 距離0m から測定可能な位相干渉に基づく1ch 音響測距法の小型システムによる実現 [Not invited]中迫 昇; 篠原 寿広; 小泉 裕司; 上保 徹志日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- 位相干渉に基づく1ch 音響測距における測定系の影響の除去に関する基礎的検討 [Not invited]西前 達矢; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2013/03 東京都八王子市 日本音響学会研究発表会
- A basic study to manipulate volume data of brain blood vessel using its position and diameter [Not invited]白石 卓人; 篠原 寿広; 中迫 昇; 中山 雅人電子情報通信学会 2013/01 沖縄 電子情報通信学会
- Estimation of Center Line and Diameter of Blood Vessel by Vessel Tracing with Sequenctially Binarized Head CTA Image [Not invited]菅井 駿; 篠原 寿広; 中迫 昇; 中山 雅人電子情報通信学会 2013/01 沖縄 電子情報通信学会
- 2ch観測によるシステム同定とマイクロホン間の距離情報に基づく音響測距法 [Not invited]鈴木 和博; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志; 近藤 善隆; 福島 学平成24年電気関係学会関西支部連合大会 2012/12 吹田市 平成24年電気関係学会関西支部連合大会
- 実環境雑音に対する情報提示音声の位相干渉に基づく音響測距法の評価 [Not invited]根木 佑真; 中迫 昇; 篠原 寿広; 中山 雅人平成24年電気関係学会関西支部連合大会 2012/12 吹田市 平成24年電気関係学会関西支部連合大会
- 送受音器の移動を考慮した干渉に基づく距離と速度推定法の実験的検討 [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志平成24年電気関係学会関西支部連合大会 2012/12 吹田市 平成24年電気関係学会関西支部連合大会
- Estimation of Centerline and Diameter of Brain Vessel in 3D Head CTA Image by Using Model Matching Method [Not invited]篠原 寿広; 前川 将志; 中山 雅人; 中迫 昇International Forum on Medical Imaging in Asia 2012/11 Daejeon, Korea International Forum on Medical Imaging in Asia
- 時間変化を伴う乗法要素が独立成分分析に及ぼす影響 [Not invited]中迫 昇; 西前 達矢; 小林 真優子日本音響学会研究発表会 2012/09 長野県長野市 日本音響学会研究発表会
- 雑音環境下における情報提示音声の位相干渉に基づく音響測距法 -SNR に応じたフレーム長変更による雑音対策の検討- [Not invited]根木 佑真; 中迫 昇; 篠原 寿広; 中山 雅人日本音響学会研究発表会 2012/09 長野県長野市 日本音響学会研究発表会
- 音響測距に基づく立体音場再現手法におけるパラメトリックスピーカの配置に関する検討 [Not invited]廣畑 和紀; 中迫 昇; 篠原 寿広; 中山 雅人日本音響学会研究発表会 2012/09 長野県長野市 日本音響学会研究発表会
- Extraction of the cerebral blood vessel from the head CTA image based on the Bayes' theorem using a blood vessel position, radius, and luminance distribution [Not invited]宮内 亮太郎; 篠原 寿広; 中山 雅人; 中迫 昇日本医用画像工学会(JAMIT2012) 2012/08 北海道 日本医用画像工学会(JAMIT2012)
- A Simplified Estimation Method for Environmental Noises Using Independent Component Analysis [Not invited]三谷 康夫; 中迫 昇19th International Congress on Sound and Vibration (Vilnius, Lithuania) 2012/07 19th International Congress on Sound and Vibration (Vilnius, Lithuania)
- The vibration detection by time tracking the estimated distance specrum using the Acoustic Distance Measurement method with the cross spectral technique [Not invited]近藤 善隆; 中迫 昇; 重黒木 啓介; 利光 翔; 福島 学; 松本 光雄; 柳川 博文; 黒岩 和治第56回システム制御情報学会研究発表講演会 2012/05 京都市南区 第56回システム制御情報学会研究発表講演会
- A study of acoustic distance measurement method based on interference of speech presented by a dialogue system in real environments [Not invited]中山 雅人; 中迫 昇; 根木 佑真; 上保 徹志; 西浦敬信電子情報通信学会応用音響研究会 2012/05 大阪市北区 電子情報通信学会応用音響研究会
- Visualization of Cerebrovascular Structure Based on Position and Caliber of Blood Vessel [Not invited]篠原 寿広; 中迫 昇; 中山 雅人システム制御情報学会 2012/05 京都 システム制御情報学会
- 話者と雑音の方位推定に基づく複数死角制御型ビームフォーマの検討 [Not invited]中山 雅人; 中迫 昇; 西浦 敬信; 山下 洋一日本音響学会研究発表会 2012/03 横浜市神奈川区 日本音響学会研究発表会
- 距離スペクトルの時間変動に着目した微振動周期検出に関する一検討 [Not invited]近藤 善隆; 中迫 昇; 稲毛 貴幸; 福島 学; 松本 光雄; 柳川 博文; 黒岩 和治日本音響学会研究発表会 2012/03 横浜市神奈川区 日本音響学会研究発表会
- 雑音環境下における情報提示音声の位相干渉に基づく音響測距法の検討 [Not invited]中山 雅人; 中迫 昇; 根木 佑真日本音響学会研究発表会 2012/03 横浜市神奈川区 日本音響学会研究発表会
- クロススペクトル法を用いた位相干渉に基づく音響距離法の検討 [Not invited]河西 慶治; 中迫 昇; 中山 雅人; 上保 徹志; 福島 学日本音響学会研究発表会 2012/03 横浜市神奈川区 日本音響学会研究発表会
- 左右のパラメトリックスピーカを用いた音響測距に基づく立体音場再現 -距離減衰,両耳間時間差と回折音に関する検討- [Not invited]廣畑 和紀; 中迫 昇; 中山 雅人日本音響学会研究発表会 2012/03 横浜市神奈川区 日本音響学会研究発表会
- Estimation of Center Line and Diameter of Blood Vessel by Vessel Tracing with Simple Binarized Head CTA Image [Not invited]前川 将志; 篠原 寿広; 中山 雅人; 中迫 昇電子情報通信学会(医用画像研究会) 2012/01 沖縄 電子情報通信学会(医用画像研究会)
- A experimental study of acoustic distance measurement based on cross-spectral method using 2-channel microphones [Not invited]河西 慶治; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志計測自動制御学会関西支部・システム制御情報学会 若手研究発表会 2012/01 大阪市北区 計測自動制御学会関西支部・システム制御情報学会 若手研究発表会
- クロススペクトル法を用いた位相干渉に基づく音響測距における観測雑音の影響と一対策 [Not invited]鈴木 和博; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志; 福島 学平成25年度電気関係学会関西連合大会 2011/11 吹田市 平成25年度電気関係学会関西連合大会
- Distance measurement method measurable from 0m based on power spectrum fluctuation of the interference sound for 1ch observations [Not invited]中迫 昇; 篠原 寿広; 河西 慶治; 上保 徹志電子情報通信学会応用音響研究会 2011/11 熊本 電子情報通信学会応用音響研究会
- 送受音器の移動を考慮した干渉に基づく音響測距法の基礎的検討 [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志平成23年電気関係学会関西支部連合大会 2011/11 姫路市 平成23年電気関係学会関西支部連合大会
- パワースペクトルのフーリエ変換に基づく距離0mから測定可能な音響測距法の検討 [Not invited]中迫 昇; 篠原 寿広; 河本 敬子; 河西 慶治; 上保 徹志平成23年電気関係学会関西支部連合大会 2011/11 姫路市 平成23年電気関係学会関西支部連合大会
- A fundamental study of three-dimensional sound field reproduction based on the acoustic distance measurement method using parametric loudspeakers on the right and left sides [Not invited]廣畑 和紀; 篠原 寿広; 中迫 昇; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/09 島根県松江市 日本音響学会研究発表会
- A study of the acoustic distance measurement method measurable from 0m based on phase of range spectrum [Not invited]河西 慶治; 篠原 寿広; 中迫 昇; 上保 徹志; 中山 雅人日本音響学会研究発表会 2011/09 島根県松江市 日本音響学会研究発表会
- An experimental study of the effects of both reflection coefficient and distance decay in the acoustic distance measurement method based on interference [Not invited]中山 雅人; 篠原 寿広; 中迫 昇; 英 慎平; 上保 徹志日本音響学会研究発表会 2011/09 島根県松江市 日本音響学会研究発表会
- A fundamental study of the acoustic measurement method based on interference considering the movement of the loudspeaker and microphone [Not invited]英 慎平; 篠原 寿広; 中迫 昇; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/09 島根県松江市 日本音響学会研究発表会
- Estimation of distance from sound source using single microphone based on interference between transmitted and reflected waves [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志INTER-NOISE 2011, the 40th International Congress and Exposition on Noise Control Engineering, 2011/09 INTER-NOISE 2011, the 40th International Congress and Exposition on Noise Control Engineering,
- Multiple-nulls-steering beamformer based on both talkers and noises localization [Not invited]中山 雅人; 中迫 昇; 西浦 敬信; 山下 洋一INTER-NOISE 2011, the 40th International Congress and Exposition on Noise Control Engineering 2011/09 大阪 INTER-NOISE 2011, the 40th International Congress and Exposition on Noise Control Engineering
- Development the three-dimensional pointing device by single camera using ARToolKit to support the brain blood vessel disease diagnosis [Not invited]白石 卓人; 篠原 寿広; 中山 雅人; 中迫 昇日本医用画像工学会(JAMIT2011) 2011/08 群馬 日本医用画像工学会(JAMIT2011)
- A fundamental study of multiple-nulls-steering beamformer based on both talkers and noises localization [Not invited]中山 雅人; 中迫 昇; 西浦敬信; 山下洋一電子情報通信学会応用音響研究会 2011/05 大阪市北区 電子情報通信学会応用音響研究会
- A study of robot sensor system by using speech for information presentation [Not invited]中山 雅人; 中迫 昇; 篠原 寿広; 上保 徹志; 英 慎平第55回システム制御情報学会研究発表講演会 2011/05 吹田市 第55回システム制御情報学会研究発表講演会
- Consideration on the effect of frequency-amplitude characteristics of the transmitted sound and measuring system on distance estimation method based on phase interference and trial to remove the effect [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/03 東京都新宿区 日本音響学会研究発表会
- Acoustic tracking method based on interference for a moving object - a fundamental study with linear chirp signal - [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/03 東京都新宿区 日本音響学会研究発表会
- A study of acoustic distance measurement method based on phase interference of computer-emitted speech using phoneme segmentation [Not invited]西前 達矢; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/03 東京都新宿区 日本音響学会研究発表会
- A study of object localization based on a two-channel acoustic distance measurement method using a transmitted sound with high frequency components [Not invited]廣畑 和紀; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志日本音響学会研究発表会 2011/03 東京都新宿区 日本音響学会研究発表会
- Acoustic distance measurement method based on phase interference using linear chirp signal ―A trail on tracking of a moving object― [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 中山 雅人; 上保 徹志電子情報通信学会応用音響研究会 2011/01 京田辺市 電子情報通信学会応用音響研究会
- Distance estimation based on interference between transmitted and reflected audible sound in actual environment ( some trials on removing the effect of frequency-amplitude characteristics of the transmitted sound and measuring system and their comparativ [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 中山 雅人; 上保 徹志電子情報通信学会応用音響研究会 2010/11 福岡 電子情報通信学会応用音響研究会
- Robust Acoustic Distance Measurement Method Based on Interference in Noisy Environments [Not invited]中山 雅人; 中迫 昇; 英 慎平; 上保 徹志The 2010 International Symposium on Communications and Information Technologies (ISCIT2010) 2010/10 東京(明治大学)、日本 The 2010 International Symposium on Communications and Information Technologies (ISCIT2010)
- Distance Estimation Method Measurable from 0m Based on Standing Wave Using Band-limited Sound with Uniform Amplitude and Random Phase [Not invited]河西 慶治; 中迫 昇; 篠原 寿広; 上保 徹志The 2010 International Symposium on Communications and Information Technologies (ISCIT2010) 2010/10 東京(明治大学)、日本 The 2010 International Symposium on Communications and Information Technologies (ISCIT2010)
- Estimation of Center Line and Diameter of Blood Vessel in Three-dimensional Head CTA by Vessel Tracing with Three-dimensional Blood Vessel Matching Method [Not invited]前川 将志; 篠原 寿広; 中山 雅人; 中迫 昇計測自動制御学会(第27回センシングフォーラム) 2010/09 群馬 計測自動制御学会(第27回センシングフォーラム)
- Three-dimensional sound field reproduction method based on acoustic distance measurement using near loudspeakers -- a study of a sound quality and its correction method-- [Not invited]中山 雅人; 中迫 昇; 廣畑 和紀日本音響学会研究発表会 2010/09 大阪府吹田市 日本音響学会研究発表会
- A study of acoustic distance measurement method based on interference by using subtraction of known signals [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志; 中山 雅人日本音響学会研究発表会 2010/09 大阪府吹田市 日本音響学会研究発表会
- A fundamental study of acoustic distance measurement method based on interference of a transmitted wave having a time width to a moving object [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2010/09 大阪府吹田市 日本音響学会研究発表会
- A consideration on 2-channel acoustic distance estimation method measurable from 0m based on phase interference [Not invited]河西 慶治; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2010/09 大阪府吹田市 日本音響学会研究発表会
- A study of talker localization method by combining a two-channel acoustic distance measurement method and a CSP method [Not invited]太田 将史; 中迫 昇; 篠原 寿広; 上保 徹志; 中山 雅人日本音響学会研究発表会 2010/09 大阪府吹田市 日本音響学会研究発表会
- Estimation of Center Line and Diameter of Brain Blood Vessel Using Three-dimensional Blood Vessel Matching Method with Head Three-dimensional CTA [Not invited]前川 将志; 篠原 寿広; 中山 雅人; 中迫 昇日本医用画像工学会(JAMIT2010) 2010/08 神奈川 日本医用画像工学会(JAMIT2010)
- Fundamental study on distance estimation using audible sound for aiming to analyze an ability of reading a sign of surrounding objects [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志第54回システム制御情報学会研究発表講演会 2010/05 京都 第54回システム制御情報学会研究発表講演会
- A study of three dimensional sound field reproduction based on distance estimation using near loudspeaker on the right and left sides [Not invited]中山 雅人; 中迫 昇電子情報通信学会応用音響研究会 2010/05 神戸市 電子情報通信学会応用音響研究会
- A trial of distance estimation to a subject with speech (based on standing wave theory) [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志日本音響学会研究発表会 2010/03 東京都調布市 日本音響学会研究発表会
- A study of distance estimation based on interference of audible sound for a moving object [Not invited]中山 雅人; 中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志日本音響学会研究発表会 2010/03 東京都調布市 日本音響学会研究発表会
- Estimation of distance from sound source using single microphone based on interference between transmitted and reflected audible sound (utilization of duplicative reflection) [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2010/03 東京都調布市 日本音響学会研究発表会
- Distance estimation method measurable from 0m using a standing wave of audible sound -- Utilization of band-limited Gaussian noise -- [Not invited]永島 侑佳; 中迫 昇; 篠原 寿広; 上保 徹志電子情報通信学会応用音響研究会 2010/01 吹田市 電子情報通信学会応用音響研究会
- 可聴音を送信波とする反射波との位相干渉に基づく距離推定 [Not invited]英 慎平; 中迫 昇; 上保 徹志; 篠原 寿広; 武田 昌一関西合同音声ゼミ 2009/11 近畿大学(紀の川市) 関西合同音声ゼミ
可聴音を用いて音源から物体までの距離を推定する手法について検討した。 - Distance estimation based on interference between transmitted and reflected audible sound---a trial on removing the effect of frequency-amplitude characteristics of the transmitted sound and measuring system--- [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志電子情報通信学会応用音響研究会 2009/11 広島 電子情報通信学会応用音響研究会
- 可聴音における定在波を用いた0mから測定可能な距離推定法-帯域ガウス雑音の利用- [Not invited]永島 侑佳; 中迫 昇; 篠原 寿広; 上保 徹志平成21年電気関係学会関西支部連合大会 2009/11 吹田市 平成21年電気関係学会関西支部連合大会
- Correction Method of Estimated Distance Using Geometrical Information on Sound Source and Microphone [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 上保 徹志2009 Asia-Pacific Signal and Information Processing Association, Annual Summit and Conference 2009/10 札幌 2009 Asia-Pacific Signal and Information Processing Association, Annual Summit and Conference
- 脳血管の構造分析のための頭部3次元CT画像を用いた血管追跡による血管位置情報の推定 [Not invited]篠原 寿広; 中山 雅人; 中迫 昇; 長谷川 敦史第26 回センシングフォーラム 2009/09 茨城 第26 回センシングフォーラム
- Fundamental consideration on distance estimation based on interference between transmitted and reflected waves using audible sound (Removal of the frequency-amplitude characteristic of measuring system) [Not invited]英 慎平; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2009/09 福島県郡山市 日本音響学会研究発表会
- Distance estimation based on the standing wave thoery under white noise input (Reduction of the number of experiments due to the removal of frequency-amplitude characteristics of the transmitted sound and measuring system) [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志日本音響学会研究発表会 2009/09 福島県郡山市 日本音響学会研究発表会
- Distance Estimation and Compensation Method Using Band-limited Transmitted Wave with Uniform Amplitude and Random Phase Characteristics [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志The 24th International Technical Conference on Circuits/Systems, Computers and Communications 2009/07 済州島、大韓民国 The 24th International Technical Conference on Circuits/Systems, Computers and Communications
- Distance estimation based on acoustical standing wave using audible transmitted wave and its compensation method [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志第53回システム制御情報学会研究発表講演会 2009/05 神戸 第53回システム制御情報学会研究発表講演会
- 感情音声のスペクトル傾斜の特徴解析 -声質変換型感情音声合成の研究- [Not invited]武田 昌一; 上野 雄大; 中迫 昇; 中川 秀夫; 鶴 真紀子; 磯部 理沙子日本音響学会 2009/03 東工大(目黒区) 日本音響学会
感情音声の合成を目的として,声優が発声する自然音声の声質の特徴解析を行っている。今回は,音声信号のスペクトル傾斜に着目し,感情の種類との関係を調べた。その結果,「平常」に比べて「激怒」の方がスペクトル傾斜が大きいことがわかった。同様に,「喜び」におけるスペクトル傾斜も「平常」の場合より大きい。このことは,「激怒」および「喜び」の方が「平常」より高域が強調された声質に変化していることを意味している。2名の声優の音声5単語についてほぼ同様の結果が得られた。 - 櫛形フィルタを用いたN/S 比算出自動化の検討 -声質変換型感情音声合成の研究- [Not invited]武田 昌一; 坂口 華奈子; 土橋 麻衣; 小林 正幸; 中迫 昇; 中川 秀夫; 鶴 真紀子; 磯部 理沙子日本音響学会 2009/03 東工大(目黒区) 日本音響学会
音声に含まれる感情の種類・度合によって,音源に含まれる雑音のレベルがどのように変化するかを調べる研究の一環として,雑音量を定量化する指標である N/S 比について検討を行った。その中で,筆者らが提案した櫛形フィルタを用いた N/S 比の精度向上と計算の効率化を目的として,櫛の位置と幅を自動決定する手法を提案した。この手法では,残差パワーの周波数に関する二階微分値のピークを櫛の位置と幅の情報として用いている。この手法により,櫛形の自動調整が可能であるとの見通しがついた。 - A study of talker localization based on distance estimation using the standing wave and microphone array [Not invited]中山 雅人; 篠原 寿広; 中迫 昇; 定野 一也日本音響学会研究発表会 2009/03 東京都 日本音響学会研究発表会
- Fundamental consideration of distance estimation based on interference between transmitted and reflected waves using audible sound (Compensation by geometric arrangement of sound source and microphone) [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 永島 侑佳; 上保 徹志日本音響学会研究発表会 2009/03 東京都 日本音響学会研究発表会
- A consideration on distance estimation based on the standing wave and its implementation (utilization of chirp sound signal) [Not invited]土田 悠太; 中迫 昇; 篠原 寿広; 上保 徹志電子情報通信学会応用音響研究会 2009/01 京都市 電子情報通信学会応用音響研究会
- Consideration on distance estimation using interference between transmitted and reflected sound ---Utilization of band-limited Gaussian noise--- [Not invited]中迫 昇; 篠原 寿広; 永島 侑佳; 上保 徹志電子情報通信学会応用音響研究会 2008/11 熊本 電子情報通信学会応用音響研究会
- 可聴音における定在波を用いた帯域ガウス雑音送信下の対象物の個数及び距離の推定 [Not invited]永島 侑佳; 中迫 昇; 篠原 寿広; 上保 徹志平成20年電気関係学会関西支部連合大会 2008/11 京都市 平成20年電気関係学会関西支部連合大会
- 摂動法の援用による連立方程式法に基づく能動騒音制御の試み [Not invited]山田 倫矢; 中迫 昇; 篠原 寿広; 藤井 健作; 梶川嘉延平成20年電気関係学会関西支部連合大会 2008/11 京都市 平成20年電気関係学会関西支部連合大会
- 定在波に基づく距離推定における推定時間短縮のためのChirp音信号利用の検討 [Not invited]土田 悠太; 中迫 昇; 篠原 寿広; 上保 徹志平成20年電気関係学会関西支部連合大会 2008/11 京都市 平成20年電気関係学会関西支部連合大会
- Distance estimation method between microphone and targets using band-limited random noise and its statistical property [Not invited]中迫 昇; 篠原 寿広; 永島 侑佳; 上保 徹志第18回インテリジェント・システム・シンポジウム 2008/10 広島 第18回インテリジェント・システム・シンポジウム
- Fundamental consideration on estimation of distance from microphone to object with audible sound based on standing wave theory (Geometrical positions of sound source, microphone and object) [Not invited]中迫 昇; 篠原 寿広; 英 慎平; 上保 徹志日本音響学会研究発表会 2008/09 福岡 日本音響学会研究発表会
- Distance estimation between microphone and target based on phase interference using a transmitted signal of band-limited gaussian noise [Not invited]中迫 昇; 篠原 寿広; 永島 侑佳; 上保 徹志日本音響学会研究発表会 2008/09 福岡 日本音響学会研究発表会
- Distance estiomation based on periodicity of power spectrum induced by interference between transmitted and reflected sound [Not invited]中迫 昇; 篠原 寿広; 上保 徹志; 森 淳第52回システム制御情報学会研究発表講演会 2008/05 京都 第52回システム制御情報学会研究発表講演会
- Distance measurement with audible chirp signal based on standing wave [Not invited]土田 悠太; 中迫 昇; 篠原 寿広; 上保 徹志電子情報通信学会総合大会 2008/03 北九州市 電子情報通信学会総合大会
- Experimental consideration on distance estimation using interference of transmitted wave and reflected wave (validity ofdistance estimatiion and estimation of reflection coefficients) [Not invited]森 淳; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2008/03 東京 日本音響学会研究発表会
- Distance estimation to targets using white gaussian noise signal [Not invited]板垣 英恵; 中迫 昇; 篠原 寿広; 上保 徹志; 大亦 紀光平成20年度電気学会全国大会 2008/03 福岡市 平成20年度電気学会全国大会
- A trial on the implimentation for distance estimation method based on standing waves of audible sound [Not invited]大亦 紀光; 中迫 昇; 篠原 寿広; 上保 徹志電子情報通信学会応用音響研究会 2008/01 吹田 電子情報通信学会応用音響研究会
- Distance estimation based on standing wave theory with impuse aound -- experimental comparison with cepstrum analysis [Not invited]森 淳; 中迫 昇; 篠原 寿広; 上保 徹志平成19年度電気関係学会関西支部連合大会 2007/11 枚方 平成19年度電気関係学会関西支部連合大会
- Fundamental consideration on distance measurement by using band-limited random noise [Not invited]大亦 紀光; 中迫 昇; 上保 徹志平成19年度電気関係学会関西支部連合大会 2007/11 枚方 平成19年度電気関係学会関西支部連合大会
- Fundamental consideration on distance estimation based on interference between transmitted and reflected sound [Not invited]中迫 昇; 篠原 寿広; 上保 徹志; 森 淳電子情報通信学会応用音響研究会 2007/11 熊本 電子情報通信学会応用音響研究会
- Distance estimation based on standing wave of audible sound under a pulse input (Comparison with Cepstrum analysis) [Not invited]森 淳; 中迫 昇; 篠原 寿広; 上保 徹志日本音響学会研究発表会 2007/09 甲府 日本音響学会研究発表会
- On distance measurement using band-limited noise [Not invited]中迫 昇; 上保 徹志; 大亦 紀光; 森 淳SICE Annual Conference 2007 2007/09 高松 SICE Annual Conference 2007
- Distance estimation to targets using band-limted signal [Not invited]中迫 昇; 上保 徹志; 大亦 紀光; 板垣 英恵平成19年度電気学会電子・情報・システム部門大会 2007/09 堺市 平成19年度電気学会電子・情報・システム部門大会
- Distance estimation using standing wave with impusive sound [Not invited]森 淳; 中迫 昇; 上保 徹志関西地区 信号処理とその応用研究会 2007/08 淡路 関西地区 信号処理とその応用研究会
- Distance measurement by audible sound (Utilization of band-limited signal with random phase) [Not invited]大亦 紀光; 中迫 昇; 上保 徹志; 森 淳The China-Japan Joint Conference of Acoustics 2007 (JCA2007) 2007/06 仙台 The China-Japan Joint Conference of Acoustics 2007 (JCA2007)
- Simplified estimation method for environmental noises using Independent Component Analysis [Not invited]三谷 康夫; 中迫 昇; 筒本 和広第51回システム制御情報学会研究発表講演会 2007/05 京都 第51回システム制御情報学会研究発表講演会
- Distance measurement to targets using audible sound (Possilbility of utilization of standing wave) [Not invited]中迫 昇; 上保 徹志; 大亦 紀光; 森 淳第51回システム制御情報学会研究発表講演会 2007/05 京都 第51回システム制御情報学会研究発表講演会
- Distance measurement by audible sound (Experimental consideration using band-limited noise) [Not invited]大亦 紀光; 中迫 昇; 上保 徹志; 森 淳電子情報通信学会総合大会 2007/03 名古屋 電子情報通信学会総合大会
- Distance estimation using standing wave for audible sound (Fundamenal experiment with impulse input) [Not invited]森 淳; 中迫 昇; 上保 徹志; 大亦 紀光日本音響学会研究発表会 2007/03 東京 日本音響学会研究発表会
- Sound reduction property of one-dimensional duct with random loadings [Not invited]中迫 昇; 小倉 久直; 石川 礼The 35th International Congress and Exposition on Noise Control Engineering (Inter-noise 2006) 2006/12 Hawaii The 35th International Congress and Exposition on Noise Control Engineering (Inter-noise 2006)
- 可聴音による距離推定の基礎的検討 -- 帯域信号による定在波の利用 -- [Not invited]中迫 昇; 上保 徹志; 大亦 紀光; 森 淳平成18年度電気関係学会関西支部連合大会 2006/11 枚方 平成18年度電気関係学会関西支部連合大会
- A simplified estimation method for environmental noises using Independent Component Analysis [Not invited]三谷 康夫; 中迫 昇; 筒本 和広計測自動制御学会中国支部学術講演会 2006/11 金沢 計測自動制御学会中国支部学術講演会
- A trial to song searchin system considerinag individual vocal range [Not invited]村上 百合枝; 中迫 昇計測自動制御学会中国支部学術講演会 2006/11 金沢 計測自動制御学会中国支部学術講演会
歌声には、人それぞれに声質がある。例えば、太い声、細い声、かすれ声、声域などが挙げられるが、このような個人の声質に合った歌曲を選曲するのはなかなか困難である。本研究では、歌声の声質の中でも特に声域に注目し、個人の声域により近い音域の歌曲の自動検索や指定曲を個人の声域の高さにより近くなるように移調するシステムを提案する。 - A trial of analyzing an acoustic signal by time-frequency distrubution -- Introduction of Copula-based positive time-frequency distribution -- [Not invited]中迫 昇; 田中 祐紀; 村上 百合枝日本音響学会研究発表会 2006/09 金沢 日本音響学会研究発表会
音響分野に限らず信号の性質を調べるためにさまざまな方法が提案されており、なかでも時間-周波数分析法はしばしば用いられる。しかし、それらは一般に時間分解能と周波数分解能の間には不確定性の関係がある。近年、より精密な時間的変化,周波数的変化を同時に見るために時間-周波数でのパワー変化の分布(すなわち、正値時間-周波数分布)に着目する手法が提案されている。前報に引き続き本研究では、Copulaに基づく正値時間-周波数分布を導入し、音響信号の分析のために音声解析への応用を検討する。 - Fundamenal consideration on distance estimation using standing wave [Not invited]中迫 昇; 上保 徹志; 森 淳; 大亦 紀光日本音響学会研究発表会 2006/09 金沢 日本音響学会研究発表会
対象物までの距離を推定するために超音波等がしばしば用いられ,その推定原理としては,送信パルスと対象物からの反射波との時間差が利用されている.しかし,この手法では対象物が数10cmに存在する状況では反射波が送信波に埋もれてしまい推定できなくなる.これに対してマイクロ波レーダの分野では,定在波を利用して近距離計測を行う手法が知られている.本研究では可聴音に着目し,スピーカから放射された音と対象物からの反射音の干渉によって生じる定在波を利用した距離の推定法を基礎から検討する. - Fundamental Consideration on Independent Component Analysis for 3-dimensional Complex Signals due to 3-dimensional Unitary Transformation --Maximization of Evaluation Function Based on Complex Hermite Moment-- [Not invited]中迫 昇; 小倉 久直; 中村 駿介; 山本 大介13th International Congress on Sound and Vibration (ICSV13) 2006/07 ウィーン(オーストリア) 13th International Congress on Sound and Vibration (ICSV13)
- Practical Prediction Method for Environmental Noises Using Neural Network Model [Not invited]筒本 和広; 中迫 昇; 三谷 康夫9th Western Pacific Acoustic Conference (WESPAC IX) 2006/06 ソウル(大韓民国) 9th Western Pacific Acoustic Conference (WESPAC IX)
- Simplified Estimation Method for Environmental Noises Using Independent Component Analysis [Not invited]三谷 康夫; 中迫 昇; 筒本 和広9th Western Pacific Acoustic Conference (WESPAC IX) 2006/06 ソウル(大韓民国) 9th Western Pacific Acoustic Conference (WESPAC IX)
- On the simulation for one-dimensional duct noise based on transmission-line model [Not invited]中迫 昇; 河野 俊介; 石川 礼9th Western Pacific Acoustic Conference (WESPAC IX) 2006/06 ソウル(大韓民国) 9th Western Pacific Acoustic Conference (WESPAC IX)
- 複雑に絡み合った膨大な情報を解きほぐす ―独立成分分析の基礎と応用― [Not invited]中迫 昇計測自動制御学会関西支部平成18年度講習会 2006/06 大阪 計測自動制御学会関西支部平成18年度講習会
計測自動制御学会関西支部からの依頼を受け講習会の講師を務めた。以下はその要旨である。 複数の独立信号が混合された観測信号から独立成分のみを取り出す独立成分分析 (Independent Component Analysis: ICA) が盛んに研究されている.これは単純な問題設定の割に解法がバラエティに富むためと,なにより潜在的な応用範囲が広いためと思われる.時間差のない信号の混合を Instantaneous mixture と呼び,時間差やシステムの影響を受けた場合を Convolutive mixture と呼んで区別している.このような状況において信号を分離することをブラインド分離(Blind Source Separation: BSS)問題と呼び,とくに Convolutive mixture の場合に信号源まで復元することをBlind Source Deconvolution問題と呼んでいる.ICAは原理的にはどちらの混合に対しても用いることができる. ICA はさまざまな分野で用いられるが,とくに音響信号については当初から特にカクテルパーティ効果などと関連して,音声分離のシミュレーシ - Parameter estimation based on complex ICA for time-delayed mixture and signal separation/restoration by inverse filter [Not invited]中迫 昇; 小倉 久直; 佐久間 有子日本生体医工学会大会 2006/05 福岡 日本生体医工学会大会
混合に時間差などの影響があるブラインド分離問題に対しては、周波数領域における複素ICA(独立成分分析) がよく用いられ、著者らも複素ICAの一解法を提案している。 本研究では、複素 ICA に基づいて時間差混合信号を分離する際得られる分離行列から遅延時間・振幅比の推定を行う。これを用いて混合信号の逆フィルタを構成し、実信号として帯域歪みのない分離・再生を目指す。 - BLIND SOURCE SEPARATION FOR 3-DIMENSIONAL CONVOLUTIVE MIXTURE IN TERMS OF PARAMETERIZATION OF UNITARY MATRIX AND COMPLEX HERMITE MOMENT [Not invited]中迫 昇; 小倉 久直; 中村 駿介; 山本 大介電子情報通信学会総合大会 2006/03 東京 電子情報通信学会総合大会
混合信号のブラインド分離については多くの研究が報告されており,著者らも以前に瞬時混合に対して Hermite モーメントと回転変換により,畳み込み混合に対して複素Hermiteモーメントとユニタリ変換(SU(2))により取り扱った. 本報告では,3つの複素信号が混合された場合に拡張する.具体的には,規格直交化された観測信号に対し,複素Hermite モーメントに基づく評価関数を最大化する3次元のユニタリ行列(SU(3))を推定する.最後に本手法の正当性をシミュレーションにより検証する. - A trial of analyzing an acoustic signal by Copula-based positive time-frequency distrubution -- Analysis method taking marginal distributions in time and frequency domains into consideration -- [Not invited]中迫 昇; 村上 百合枝日本音響学会研究発表会 2006/03 東京 日本音響学会研究発表会
音響分野に限らず信号の性質を調べるためにさまざまな方法が提案されている。なかでも時間-周波数分析法はしばしば用いられるが、一般に時間分解能と周波数分解能の間には不確定性の関係がある。近年、より精密な時間的変化,周波数的変化を同時に見るために時間-周波数でのパワー変化の分布(すなわち、正値時間-周波数分布)に着目する手法が提案されている。 本研究では、正値時間-周波数分布による音響信号の分析のために、Copulaに基づく正値時間-周波数分布の具体的な算出法を検討し、テンプレートとしてスペクトログラムを採用し、楽音への適用を行う。 - Fundamental Consideration on Independent Component Analysis for 3-dimensional Complex Signals due to 3-dimensional Unitary Transformation --Maximization of Evaluation Function Based on Complex Hermite Moment [Not invited]中迫 昇; 小倉 久直; 中村 駿介; 山本 大介電子情報通信学会応用音響研究会 2006/01 京都 電子情報通信学会応用音響研究会
混合信号のブラインド分離については多くの研究が報告されており,著者らも以前に複数の独立信号の同時混合を Hermite モーメントと回転変換により取り扱った.また,混合に時間差や残響などの影響がある場合には,混合信号を複素狭帯域化した後,分離する周波数(複素)領域での ICA も提案している.2信号に対しては複素HermiteモーメントとUnitary変換(SU(2))を利用するが,本報告では 3信号が畳み込み混合された場合に拡張する.具体的には,規格直交化された観測信号に対し,複素Hermite モーメントに基づく評価関数を最大化する3次元のUnitary行列(SU(3))を推定する.最後に本手法の正当性を検証するため,計算機シミュレーションを行う. - A trial of analyzing an acoustic signal by time-frequency analysis --Introduction of Copula-based positive time-frequency distribution-- [Not invited]中迫 昇; 生物理工学研究科大学院生電子情報通信学会応用音響研究会 2005/11 広島 電子情報通信学会応用音響研究会
音響信号の性質を調べるためにさまざまな方法が提案されている。なかでも信号の時間的特徴と周波数領域での特徴を同時に調べることのできる時間-周波数分析法は強力なツールとしてしばしば用いられる。時間-周波数分析法には、スペクトログラム(短時間フーリエ変換)、Wigner分布、Choi-Williams分布などのいくつかの手法が知られている。一般に、時間-周波数分析ではエネルギー分布を用いるが、正値分布としての条件をすべては満足していない。 本報では、周辺分布などの条件を満足するCopulaに基づく正値時間-周波数分布に着目する。これにより、たとえばスペクトログラムなどに比べ、時間と周波数両方において分解能の向上が期待できる。最終的な目標を正値時間-周波数分布による音響信号の分析と定め、今回はCopulaに基づく正値時間-周波数分布の具体的な算出法を検討する。最後にテンプレートとしてスペクトログラムを採用し、簡単なシミュレーションや楽音への - Sound Reduction Property of One-Demensional Duct with Random Loading [Not invited]中迫 昇; 生物理工学部電子システム情報工学科; 大学院生物理工学研究科電子システム情報工学専攻院生日本音響学会研究発表会 2005/09 仙台 日本音響学会研究発表会
電磁波の分野では、不規則に揺らいでいる媒質中を波が伝わるとき、波が小さな領域に閉じ込められる局在現象が知られている。よって、ランダム媒質あるいはランダムな装荷をもつ音場でも指数関数的な音の減衰があり、それを騒音抑圧に利用可能と思われる。 ランダム媒質による減衰効果を考察した既発表に引き続き、本研究では1次元音場の等価回路表現を用いて、ランダム装荷をもつダクトの減衰特性を検討し、シミュレーションにより正当性を検証する。 - Blind separation of N-dimensional mixed signals in terms of Hermite moment and its application to EEG data [Not invited]中迫 昇; 山脇 伸行; 生物理工学部電子システム情報工学科The 5th international Workshop on Biosignal Interpretation 2005/09 Tokyo The 5th international Workshop on Biosignal Interpretation
複数の信号が混合された観測信号から源信号を分離する問題をブラインド分離という。その解法の一つに源信号の統計的独立性に基づく独立成分分析(ICA)がある。本研究では、著者等の提案している Hermte モーメントに基づくICA 手法を、多チャンネルの脳波(EEG)データの分離に適用する。本手法により、ノイズ成分(アーチファクト)を取り除けることが分かった。 (英文) - Effect of Non-objective Component on the Estimation in Independent Component Analysis [Not invited]中迫 昇; 小倉 久直; 帯辺 誠之12th International Congress on Sound and Vibration (ICSV12) 2005/07 リスボン(ポルトガル) 12th International Congress on Sound and Vibration (ICSV12)
源信号の統計的独立性に基づいて混合信号をブラインド的に分離する独立成分分析(ICA)が盛んに研究されている。著者等も、Hermite モーメントに基づく評価関数と回転変換により独自のICA アプローチを提案している。本研究では、対象信号以外の成分が存在する場合、評価関数にどのような影響を及ぼし、その結果、分離性能がどの程度劣化するかを理論的に考察した。シミュレーション実験でも良好な結果が得られている。 - 独立成分分析の基礎と音響・画像・生体信号への応用 [Not invited]中迫 昇甲南大学ORC 2005/07 神戸市 甲南大学ORC
甲南大学の ORC(オープン・リサーチ・センター)の客員特別研究員として講演を依頼され、著者らの手法を中心に,ICA(独立成分分析) の基礎理論とその信号処理への応用について解説した.また,音声・画像でのシミュレーション結果や実際の生体信号への適用結果の一例も示した. - SOUND REDUCTION EFFECT OF ONE-DIMENSIONAL DUCT WITH RANDOMNESS [Not invited]中迫 昇; 小倉 久直; 石川 礼2005年電子情報通信学会総合大会 2005/03 豊中市 2005年電子情報通信学会総合大会
電磁波の分野では、不規則に揺らいでいる媒質中を波が伝わるとき、波が遠くまで伝わらず小さな領域に閉じ込められる現象が知られている(局在現象)。音場においても同様に指数関数的な減衰が期待でき、騒音抑圧に利用可能と思われる。本研究では既発表に引き続き、1次元音場の等価回路表現を用いて、ランダム性をもつダクトの減衰特性を検討し、シミュレーションにより正当性を検証する。 - Blind Separation for 3 Signals in Terms of Complex Hermite Moment and 3-dimensional Unitary Transformation [Not invited]中迫 昇; 小倉 久直; 山本 大介日本音響学会2005年春季研究発表会 2005/03 小金井市 日本音響学会2005年春季研究発表会
2信号の場合について複素Hermiteモーメントとユニタリ変換(SU(2))に基づく複素 ICA をすでに報告している。本報告では、3つの複素信号が混合された場合に拡張する。具体的には、規格直交化された観測信号に対し、複素Hermite モーメントに基づく評価関数を最大化する3次元のユニタリ行列(SU(3))を推定する。 - 独立成分分析と音響信号処理への応用 [Not invited]中迫 昇; 小倉 久直平成16年電気関係学会関西支部連合大会 2004/11 京田辺 平成16年電気関係学会関西支部連合大会
平成16年電気関係学会関西支部連合大会の信号処理分野のシンポジウム「信号処理の現状と未来」に招かれ、独立成分分析(ICA) の原理と音響信号処理への応用について講演した。さらに、音源方位推定への本手法の適用例も示した。 - Fundamental consideration on sound reduction property in one-dimensional duct with random media. [Not invited]中迫 昇; 小倉 久直日本音響学会研究発表会 2004/09 那覇 日本音響学会研究発表会
電磁波が、不規則に揺らいでいる媒質があると局在現象が起こる。本研究では1次元音場の等価回路表現を用い、媒質がランダムな特性を示す場合、音でも同様の局在化が起こることを示し、減衰特性についてシミュレーションを行い、その正当性を検証する。 - Two-stage filters for canceling a one-dimensional duct noise based on transmission-line model [Not invited]中迫 昇; 小倉 久直; 出口 高敏; 石川 礼The 47th IEEE International Midwest Symposium on Circuit Systems (MWSCAS) 2004/08 Hiroshima The 47th IEEE International Midwest Symposium on Circuit Systems (MWSCAS)
1次元ダクト内の音の振る舞いは電気工学の等価回路を用いて表すことができる。本研究では、マイクロホン2本の観測信号を用いて騒音を打ち消すために2段のフィルタを導入した。さらに帯域信号を用いたシミュレーションによりその正当性を検証した。 - ANC of one-dimensional duct based on equivalent circuit model [Not invited]中迫 昇; 小倉 久直; 出口 敏高International Congress on Acoustics 2004 (ICA2004) 2004/04 Kyoto International Congress on Acoustics 2004 (ICA2004)
騒音を逆位相の音で打ち消す能動騒音制御(ANC)について、特に1次元ダクトに着目して、回路理論に基づき新たな制御理論を提案し、純音に関するシミュレーションによりその正当性を検証した。 - The effect of non-objective component on the parameter estimation in independent component analysis [Not invited]中迫 昇; 小倉 久直; 瀬尾 訓生(社)日本音響学会研究発表会 2004/03 東京 (社)日本音響学会研究発表会
近年盛んに研究されている独立成分分析(ICA)では、対象外成分が存在すると分離性能は劣化する。本研究では、著者らがすでに提案しているHermiteモーメントと回転変換に基づくICA 手法について,対象外成分によりどのように推定精度が劣化するか検討し,シミュレーションを通じて確認する. - On the ANC in one-dimensional duct and the filter design for control [Not invited]中迫 昇; 小倉 久直; 山下耕司; 出口高敏計測自動制御学会中国支部学術講演会(岡山) 2003/11 計測自動制御学会中国支部学術講演会(岡山)
分布定数系の等価回路により1 次元音場を書き直すと、主・副音源を用いた音場の制御が原理的に可能となる。これによると騒音制御用のフィルタ設計も容易である。本研究では、とくに1 次元ダクトを具体例とするシミュレーションを報告するが、結果は良好であった。 - Direction findings of arrival sound based on the blind source separation and restoration of signals with inverse filtering [Not invited]中迫 昇; 小倉 久直; 佐久間有子計測自動制御学会中国支部学術講演会(岡山) 2003/11 計測自動制御学会中国支部学術講演会(岡山)
時間差混合信号に対する複素ブラインド分離の分離行列から遅延時間・振幅比の推定を行い、音源位置・方位を推定する手法を提案する。さらに推定パラメータを用いて混合信号の逆フィルタを構成することにより、帯域歪みのない実信号としての分離・再生を行う。 - The estimation of sound source positions based on the estimated parameters of the complex ICA [Not invited]中迫 昇; 小倉 久直; 米森裕典計測自動制御学会中国支部学術講演会(岡山) 2003/11 計測自動制御学会中国支部学術講演会(岡山)
複素ICA(Independent Component Analysis)に基づいて時間差混合信号を分離する際得られる分離行列から遅延時間・振幅比の推定が行える。これにより音源位置の推定が原理的に可能となる。本研究では、音声によるシミュレーションを通じて理論の正当性を検証する。 - Active noise control for one-dimensional duct using equivalent circuit representation [Not invited]中迫 昇; 小倉 久直; 出口高敏.日本音響学会研究発表会(名古屋) 2003/09 .日本音響学会研究発表会(名古屋)
すでに1 次元ダクトの伝送線路モデルを基本にして1 次元ダクトの能動騒音制御(Active Noise Control:ANC)を考察している。本研究では、既発表の理論に基づいて行ったシミュレーションを中心に報告した。結果は良好であり、理論の正当性の一部が示せた。 - On active noise control for one-dimensional sound field based on equivalent circuit model [Not invited]中迫 昇; 小倉 久直; 出口高敏.日本騒音制御工学会研究発表会(習志野) 2003/09 .日本騒音制御工学会研究発表会(習志野)
様々な観点から研究がなされている能動騒音制御(Active Noise Control:ANC)について、とくに1 次元音場に対し等価回路に基づき考察した。本手法は、既存の手法に比べ、ANC の原理ならびに、制御回路の周波数特性が単純で把握しやすいという特長がある。 - ANC of one.dimensional duct based on equivalent circuit model and its simulation [Not invited]中迫 昇; 小倉 久直; 出口高敏.電子情報通信学会応用音響研究会(姫路) 2003/05 .電子情報通信学会応用音響研究会(姫路)
既発表の1次元ダクトの等価回路に基づくANCは、既存の手法に比べ、ANCの原理ならびに、制御回路の周波数伝達特性が単純で把握しやすく、フィルタの構成も容易である。本報告では、簡単なシミュレーションを通じて理論の検証を行ったので報告する。 - Sound source localization from time.shifted mixtures by complex blind separation and inverse filter design for separation/reproduction simulation on speech data [Not invited]中迫 昇; 小倉 久直; 佐久間有子.電子情報通信学会総合大会(仙台) 2003/03 .電子情報通信学会総合大会(仙台)
音源位置あるいは方向の推定のために、複素ICAに基づいて時間差混合信号の分離行列から遅延時間・振幅比の推定を行う。さらに、提案した逆フィルタによって、実際の音声信号で帯域歪みのない分離・再生ができることを、シミュレーションを通じて示す。 - Sound source localization based on the estimated parameters by complex ICA and restoration of signals blind separation for time-shifted mixtures and inverse filtering [Not invited]中迫 昇; 小倉 久直.日本音響学会研究発表会(東京) 2003/03 .日本音響学会研究発表会(東京)
時間差混合信号に対し、複素ICAによる分離行列から遅延時間・振幅比の推定を行えば、分離と同時に音源位置あるいは方向の推定が原理的に可能である。さらに推定パラメータを用いた逆フィルタにより、帯域歪みのない分離や再生ができることを確かめた。 - Simple estimation methods of the mixed wind noise in the environmental low.frequency noise measurement application for the estimation of aircraft noise or wind turbine generator noise [Not invited]中迫 昇; 高桑誠明; 歌谷昌弘; 小谷章.日本音響学会研究発表会(東京) 2003/03 .日本音響学会研究発表会(東京)
本報告では、前報告に引き続き、中型の防風スクリーンを装着した場合、また、風車発電機の騒音計測に用いられる計測システムを用いた場合の低周波雑音成分が、それぞれマイクロホン近傍の風速情報を用いて推定可能かどうかを実験的に検討している。 - Prediction of wind noise and estimation of sound signal based on wind speed information considering time-variant system [Not invited]中迫 昇; 東剛生; 高桑誠明.電子情報通信学会応用音響研究会(吹田) 2003/01 .電子情報通信学会応用音響研究会(吹田)
前報に引き続き、観測信号から風雑音を除去する手法を提案する。とくに実用的な観点から風速と風雑音の関係は線形モデルで記述し、その関係の時間変化も考慮する。さらに実際の風雑音混入下における音響信号検出の問題に本手法を適用し、その有効性を議論する。
Affiliated academic society
Research Themes
- Japan Society for the Promotion of Science:Grants-in-Aid for Scientific ResearchDate (from‐to) : 2017/04 -2020/03Author : Nakasako NoboruThe purpose of this research is to realize a distaince measurement system for detecting the distance to a human being using audible sound for devices such as nursing care and welfare robots that require a wide range of distance detection from near to far. However, the conventional method has a problem that the measurement accuracy is degraded by the influence of the measurement system between the loudspeaker and the microphone and the observation noise in the real environment. In this study, (1) a theory for the measurement is developed under high noise conditions, which is not possible with the conventional phase-interference-based acoustic distance measurement method, (2) a theory for eliminating the influence of the measurement system between the loudspeaker and the microphone is developed, and (3) the acoustic distance measurement method to a specific object is investigated. The results suggest the effectiveness of the proposed method.
- Japan Society for the Promotion of Science:Grants-in-Aid for Scientific ResearchDate (from‐to) : 2013/04 -2016/03Author : KIKKAWA Sho; YOSHIDA Hisashi; NAKASAKO Noboru; KOHAMA Takeshi(1) We introduced L and U filters having not been well-known as morphological filters and the digital pulse transform (DPT) constructed of L and U filters. (2) We proposed a new method for detecting randomly generated signals buried in noise, in particular, a new method to detect saccades in human eye movement data. We attained error-free detection of the saccades by this method which has not been achieved by traditional linear filters. This method can be widely applied to detection problems in biomedical environmental data processing. (3) Agaist the commomly accepted theory that median filtering outperforms traditional linear filtering in preserving signal edges while reducing noise, we theoretically proved that moving average filter is a better smoother preserving signal edges than the median filter under a practical wide range condition.
- Japan Society for the Promotion of Science:Grants-in-Aid for Scientific ResearchDate (from‐to) : 2012 -2014Author : NAKASAKO NoboruThe purpose of this study is to realize the distance measuring system for detecting the distance by using the audible sound, especially in a close range (e.g., where a nursing-care robot care for human). (1) Based on the previously proposed acoustic distance measurement method (ADM) using a standing wave (or phaseinterference), we improved the original ADM method, and we considered the properties and potentials of the improved ADM method. (2) We considered ADM method to measure the distance shorter than the minimum measurable distance which is defined by the bandwidth of transmitted signal. Furthermore, (3) we considered the principle method for the moving target though the original ADM method is not applicable to the moving target. Thus, it becomes possible to measure both the velocity and distance for the moving target. This implies that the distance between microphone and target is measurable eve in a case when both microphone and target are moving.
- Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(C))Date (from‐to) : 2009 -2011Author : Noboru NAKASAKOThe purpose of this study is to realize a rear-sonar of automobile for detecting obstacles(or targets) behind the automobile, using the exhaust sound of the automobile emitted from the automobile muffler. (1) We considered the fundamental properties and potentials of the distance estimation method based on the phase interference of audible sound. (2) We developed several methods, so as to reduce the error due to geometrical positions of the loudspeaker, target and microphone and the error due to the effect of the observation noise and measurement system. Furthermore, (3) we proposed a distance measurement method to measure the distance shorter than the minimum measurable distance.
- Japan Society for the Promotion of Science:Grants-in-Aid for Scientific ResearchDate (from‐to) : 2007 -2010Author : KIKKAWA Sho; YOSHIDA Hisashi; NAKASAKO Noboru; HASHIMOTO Shuji(1) We proposed a new mutual information criterion for deciding an optimal mixture distribution and an optimal threshold. (2) We proposed the usage of Renyi's alpha-entropy as a measure of width of marginal distribution and obtained very intuitive new and simple ICA methods. (3) We proposed an adaptive method for smoothing the periodogram for positive time-frequency representation. For impulse train time-frequency analysis, we proposed an inverse domain demodulation method of IPFM and an objective evaluation method for demodulators. Further, we proposed distance estimation method exploiting time-frequency feature of reflected signal from a moving object.
- Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(C))Date (from‐to) : 2005 -2006Author : Noboru NAKASAKOIt is known that a wave cannot propagate long distance in random media and is confined in a small region when the field is excited. In physics it is called the "localization", the phenomenon which is closely related to the cut-off (non-propagating) state of waves in a certain broad frequency band. It is expected that this property can be utilized as a muffler to reduce the sound noise because the sound propagating in random media or random loadings would exhibit strong exponential decay along distance. On the other hand, a one-dimensional acoustic duct can be expressed by a transmission line model commonly used in the study of microwave waveguide. In this research, I focus on the sound decaying property of one-dimensional duct (random duct) and demonstrate the validity of the proposed theory through a computer simulation. The results I obtained in 2005 and 2006 are listed below.[2005 year] : As the first step of research, I expressed the sound field in duct by a transmission line model, on which I theoretically analyzed the ordinary one-dimensional duct and carried out computer simulation. Based on the circuit representation, I theoretically proposed the sound reduction property in a case when there exist random media in duct. To confirm the validity of the analysis, I performed the computer simulation and showed the existence of the strong exponential decay. These results have been published in a scientific journal and presented in domestic conference.[2006 year] : Following to the fundamental consideration on the sound reduction problem with randomness in 2005, I theoretically proposed the sound reduction property in a case when there exist random loadings in duct and the extensive simulation makes it clear that the proposed method also enables us to cause the strong exponential decay. These results have been presented in international conferences.
- Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(C))Date (from‐to) : 2001 -2002Author : Noboru NAKASAKO; Hisanao OGURASound source localization problem has been important in various actual fields of acoustics and many approaches have been developed e.g., MUSIC, etc. Most of them utilize only the lower order statistics of observations such as a covariance matrix and the orthogonality (or uncorrelation) between the objective signal and noise. Recently , Independent Component Analysis (ICA) becomes popular to solve a blind signal separation problem where independent sources are mixed and then measured by multiple sensors. The ICA of complex signals has been also proposed for a case when observations have time differences between source signals or are affected by system (room etc.).In this research, some trials of estimating the sound source positions or directions are proposed from various viewpoints. In particular, most of them are based on the statistical independency between source signals or between the source signal and an additional noise. The results we obtained in 2001 and 2002 are listed below.[2001 year]: As the first step of research, the correlation method is introduced to calculate the delay time between observations at each microphone and then to estimate the sound direction. In the second approach, MUSIC method and Kalman filter are employed, respectively, to estimate the direction of source and to detect the amplitude information for sound source localization.The third method is a trial of estimating the time delays or the distances between receivers and sound sources based on the complex ICA, especially for the mixed observations with time delays. Further, we can easily construct an inverse filter to separate the (over-all) real mixed signals using the parameters estimated by ICA, while the usual complex ICA required synthesizing all frequency components. Finally, through fundamental simulation, we demonstrate the high-quality blind separation as well as the validity for the estimation of the source parameters.[2002 year]: Following to the fundamental consideration on the sound source localization problem in 2001, the extensive simulation makes it clear that the proposed method also enables us to find the directions of arrival. These results have been presented in domestic or international conferences.
- Japan Society for the Promotion of Science:Grants-in-Aid for Scientific ResearchDate (from‐to) : 1998 -1998Author : NAKAYAMA Hirotaka; HATTORI Yu-ichi; NAKASAKO Noboru; TAKAHASHI Yoshitaka; KUNIMATSU Takao; MITANI KatsunosukeThe main objective of this research is to make a plan and investigation for a joint research project on "Agricultural Resource Management taking into account Eco-system and Environment Problems"with IIASA (International Institute for Applied Systems Analysis) and Prof. R.H.Richardson of Texas University. To this end, 1. We co-organized a workshop on "Agricultural Resource Management taking into account Environment Problems" with the Society of Animal Production Systems, and observed Mt. Sanbe national park in which grass ground was recovered by pasturage. 2. We observed Saito Farm and others which succeeded in creating excellent environment with beautiful view by reclamation by pasturaged cattles, and co-organized a symposium on "Agriculture in Harmonious with Natural Eco-systems" with the Society of Animal Production Systems, and Open Network for Nature Conservation, In the symposium, we discussed and exchanged ideas on the basis of lectures i) Holistic Management in Agriculture in Harmonious with Eco-systems by Prof. R.H.Richardson of Texas University, and ii) Land Use Problems taking into account Earth Scale Environment by Dr. G.Fischer of IIASA. 3. We investigated the activities of Lake Biwa Research Institute, and had a meeting with a fisherman in Biwa Lake and a large scale farmer to discuss fishing and farming from the viewpoint of environmental management. Through the above activities, we clarified the theme and direction of our planning international joint research in the future.
- 文部科学省:科学研究費補助金(奨励研究(A))Date (from‐to) : 1995 -1995Author : 中迫 昇本研究では、我々の生活と切り放すことができない音環境システムに特に着目し、その信号処理を目指して、多変量解析の分野で公知の主成分分析法と因子分析法の拡張を試みた。まず、特に音環境における確率評価量(例えば、Lx、Leq)間での双方向変換関係を見いだす目的で、公知の主成分分析法を理論的に拡張した。具体的には、線形関係および自乗誤差評価(すなわち、線形相関を利用)のみに基づく従来の手法とは異なり、非線形モデルの導入や、高次相関情報の誤差評価への利用などを行なった。さらに、公知の回帰分析法と対比させながら提案手法を実測データに適用し、良好な結果を得た。この成分分析の拡張手法には次のような特長がある。すなわち、1)実現象ごもつ複雑さや各変数間の非線形性に対応できる、2)多変数間の線形相関情報のみでなく非線形相関をも利用できる、3)従来の主成分分析法をスペシャルケースで含んでいる、4)2変数のみでなく、3変数以上の場合のもそのまま本手法が拡張できる、などである。ついで、音環境における複雑な多数遮音システムを、暗騒音に埋もれた出力観測のみから同時に同定したり、その出力応答を(騒音評価量とも関連し)揺らぎ分布全体において予測する目的で、特に実用的な立場から因子分析法の考え方を拡張した。具体的には、共通因子と独自因子に実体的メカニズムをまず反映させて、それぞれ騒音入力インテンシティ、各観測点での暗騒音インテンシティとして捉え、インテンシティスケールでの線形モデルに基づきシステムパラメータとして因子負荷量を推定した。この結果を用いて、暗騒音の影響がない場合、すなわち入力騒音のみに対する出力騒音の分布予測を行うことができる。さらに、本手法を実際の音環境データへ適用することによりその有効性を実験的にも確認できた。この因子分析の拡張手法は次のような特長を持っている。すなわち、1)複数システムを同時に扱える、2)入力および暗騒音が未知でも適用できる、3)計測において入出力間の同期をとる必要がない、などである。
- 文部科学省:科学研究費補助金(奨励研究(A))Date (from‐to) : 1994 -1994Author : 中迫 昇本研究では、もともとの変動が有限な範囲内に留まっていたり、(飽和型非線形系の)計測器のダイナミック・レンジなどの存在により有限な範囲内の値を示す実際的な場合において、非定常入力を伴う系の応答解析を最終目標としている。今回は研究の初期的段階にあることから、特に飽和型非線形系における非定常変動観測時の雑音対策を、システムの物理メカニズムと直結するパワースケールとの関連で考究した。すなわち、有限レベル変動範囲のダイナミック・レンジをもつ観測データを用いて、任意分布型の外来雑音に汚された未知非定常信号(特に、パワースケールのような正の物理量)を、動的に推定してゆく推定アルゴリズムをベイズ定理に基づき開発した。具体的には、飽和の影響を受ける前の任意変動の観測値と任意非ガウス型変動を示す未知信号間の線形・非線形の各種相情報を階層的に反映した新たな信号復元法を、広義ディジタルフィルタの形で見い出した。更に本研究で得られた理論的結果を、シミュレーションデータや残響室内における暗騒音混入下の実音響データに適用し、その有効性を検証した。本研究で得られた理論の特長を列挙すると以下のとおりである。1)本手法は、外来雑音の混入とダイナミックレンジの存在に整合している。2)実システムが本質的にもつ非ガウス性、非線形性に対応できる。3)推定アルゴリズムが実用的である。すなわち、観測レンジ内では従来のベイズフィルタを形式的に採用し、観測レンジの上限、下限では確率密度の集中を簡易的に考慮している。4)スペシャルケースとして、ダイナミック・レンジが十分広い場合には、従来のベイズフィルタを理論的に包含している。本研究をもとに、今後、非定常な確率現象と計測における有限性を伴うあらゆる実分野への適用とその成果が期待できる(たとえば、機械振動、地盤振動、道路交通騒音などにおける非定常揺らぎの評価や解析など)。
- ニューラルネットワーク,ファジィ論理,遺伝アルゴリズムの不規則信号処理への適用
- 独立成分分析に関する理論と実データへの適用
- 信号処理アルゴリズムの開発と環境システムへの適用
Industrial Property Rights
- 特開2015-036084:画像処理システム 2015/02/23篠原 寿広, 中迫 昇, 中山 雅人, 白石 卓人, 池崎 健太 学校法人近畿大学 201503022243382595