■Faculty | Department of Computational Systems Biology / Graduate School of Biology-Oriented Science and Technology |

■Position | Professor |

■Degree | |

■Commentator Guide | https://www.kindai.ac.jp/meikan/441-nakasako-noboru.html |

■URL | |

Last Updated :2020/09/12

- - 1986 , Hiroshima University
- - 1986 , Hiroshima University, Graduate School, Division of Engineering
- - 1982 , Hiroshima University, Faculty of Engineering
- - 1982 , Hiroshima University, Faculty of Engineering

- 1994 , - 2002 , Faculty of Biology-Oriented Science and Technology, Kindai University
- 1990 , - 1994 , lecturer, Department of Electrical Engineering, Hiroshima Institute of Technology
- 1986 , - 1990 , Research Assistant, Department of Electrical Engineering, Hiroshima Institute of Technology,
- 1992 , - 1993 , Faculty of Eng., Kinki Univ., Lecturer
- 1984 , - 1985 , Faculty of Eng., Kinki Univ., Lecturer
- Kinki Univ., Associate Professor
- Assistant Professor
- Research Assistant

- Informatics, Statistical science
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Communication and network engineering
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Measurement engineering
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Control and systems engineering

- System Engineering, Information and Communication Engineering, Electric Measurements and Control Engineering

- Response of effective voltage-scaling factors in alpha band EEFs under affective picture stimuli, TOMINAGA Shigeru, YOSHIDA Hisashi, NAKASAKO Noboru, IWAKI Tatsuya, IEICE Trans. Infomation and Systems (Japanese Edition), IEICE Trans. Infomation and Systems (Japanese Edition), J102-D(5), 399 - 410, May 2019 , Refereed
- A Realization of Acoustic Distance Measurement System Based on Phase Interference Using Cross-Spectral Method, Song ChangRyung, Toshihiro Shinohara, Tetsuji Uebo, Noboru Nakasako, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 138(10), 1223 - 1229, Oct. 2018 , Refereed
- Implementation of a One-Channel Acoustic Distance Measurement Method Using the Cross-Spectrum of Actual and Pseudo Observations, Changryung Song, Toshihiro Shinohara, Tetsuji Uebo, Noboru Nakasako, ICIC Express Letters, Part B: Applications, ICIC Express Letters, Part B: Applications, 9(9), 899 - 906, Sep. 2018 , Refereed
- Consideration of Acoustic Distance Measurement Using the Hilbert Transform of 2ch Observations with a Linear Chirp Signal for Multiple Targets, Noboru Nakasako, Kohsuke Sakaguchi, Toshihiro Shinohara, Tetsuji Uebo, ICIC Express Letters, Part B: Applications, ICIC Express Letters, Part B: Applications, 9(8), 737 - 745, Aug. 2018 , Refereed
- Fundamental study on acoustic distance measurement using cross-spectrum between 2ch observed signals of linear chirp sound, Noboru Nakasako, Shinya Honda, Toshihiro Shinohara, Testuji Uebo, Trans. of the Institute of Systems, Control and Information Engineers, Trans. of the Institute of Systems, Control and Information Engineers, 30(9), 339 - 346, Sep. 2017 , Refereed
- 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 NAKASAKO, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J100-A(7), 295 - 298, Jul. 2017 , Refereed
- A countermeasure for ambient noise in acoustic distance measurement using cross-spectrum between 2ch obsrevations with analytic signal composed of linear chirps, Noboru Nakasako, Kohsuke Sakaguchi, Shinya Honda, Toshihiro Shinohara, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 137(11), 1443 - 1444, 2017 , RefereedSummary: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.
- Range and Velocity Estimation to a Target with Uniform Motion by Utilizing Acoustical Distance Measurement Method Based on Interference between Transmitted and Reflected Waves and by Introducing Frame Processing, HANABUSA Shimpei, NAKASAKO Noboru, NAKAYAMA Masato, SHINOHARA Toshihiro, UEBO Tetsuji, Trans. of the Institute of Systems, Control and Information Engineers, Trans. of the Institute of Systems, Control and Information Engineers, 60(5), 216 - 224, May 2016 , Refereed
- Distance Measurement to Target Based on Phase Interference Using Audible Sound ---A Principle of Acoustic Distance Measurement and Its Progress(Review Paper), NAKASAKO Noboru, UEBO Tetsuji, SHINOHRA Toshihiro, Fundamentals Review, Fundamentals Review, 9(4), 330 - 339, Apr. 2016
- Acoustic distance measurement based on phase interference between direct and reflected ultrasonic waves (estimation for close range using single transducer), Tomofumi Nakano, Noboru Nakasako, Toshihiro Shinohara, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 136(11), 1551 - 1552, 2016 , RefereedSummary: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.
- Estimation of the distance to sound source based on phase interference using cross-spectrum between actual and pseudo observed waves of a single-channel microphone, Shinya Honda, Noboru Nakasako, Toshihiro Shinohara, Tetsuji Uebo, Masato Nakayama, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 136(11), 1525 - 1531, 2016 , RefereedSummary: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.
- Acoustic distance measurement method using 2 Ch microphones measurable from 0 m based on phase interference and removal of DC component, Kazuhiro Suzuki, Noboru Nakasako, Masato Nakayama, Toshihiro Shinohara, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 135(11), 1349 - 1350, Nov. 01 2015 , RefereedSummary: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.
- Distance Estimation Based on Interference of Audible Linear Chirp Signal:—Performance Evaluation in Noisy Environments and a Trial for Noise Reduction—, Noboru Nakasako, Shimpei Hanabusa, Toshihiro Shinohara, Masato Nakayama, Tetsuji Uebo, IEEJ transactions on electronics, information and systems, IEEJ transactions on electronics, information and systems, 134(11), 1926 - 1927, Nov. 2014 , Refereed
- Distance Measurement Method Effective from 0 m Using Phase Interference of Audible Sound, Noboru Nakasako, Toshihiro Shinohara, Keiji Kawanishi, Tetsuji Uebo, ELECTRONICS AND COMMUNICATIONS IN JAPAN, ELECTRONICS AND COMMUNICATIONS IN JAPAN, 97(8), 24 - 31, Aug. 2014 Summary: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.
- Separation of artifacts mixed in the EEGs when eating with use of independent vector analysis (IVA), TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 114(51(MBE2014 1-11)), 37 - 42, May 17 2014
- The Object Localization by Acoustic Distance Measurement Method Based on Phase Interference with Cross-Spectral Method, Kazuhiro SUZUKI, Noboru NAKASAKO, Masato NAKAYAMA, Toshihiro SHINOHARA, Tetsuji UEBO, Manabu FUKUSHIMA, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J97-A(4), 343 - 346, Apr. 2014 , Refereed
- A study on superimposition mode of mastication EMG on EEG, and its trial separation with use of FDICA, TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 113(373(MBE2013 75-92)), 57 - 62, Dec. 14 2013
- A study on EEG lead systems, artifacts mixed into the EEGs when eating, and their classification methods based on ICA, TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 113(223(NC2013 22-45)), 113 - 118, Sep. 17 2013
- Acoustic Distance Measurement Method Measurable from 0 m Based on the Interference between Transmitted and Reflected Waves Using Power and Phase Spectra of Single Channel Observations, Noboru Nakasako, Keiji Kawanishi, Toshihiro Shinohara, Tetsuji Uebo, Masato Nakayama, Proc. of the 2012 IEEE International Conference on Signal Processing, Communications and Computing, Proc. of the 2012 IEEE International Conference on Signal Processing, Communications and Computing, 1 - 6, Aug. 2012 , Refereed
- Acoustic distance measurement method based on interference of speech presented by a dialogue system, Masato Nakayama, Noboru Nakasako, Yuma Neki, Tetsuji Uebo, Takanobu Nishiura, Proc. of the 2012 IEEE International Conference on Signal Processing, Communications and Computing, Proc. of the 2012 IEEE International Conference on Signal Processing, Communications and Computing, 1 - 6, Aug. 2012 , Refereed
- Distance measurement method measurable from 0m using phase interference of audible sound, Noboru Nakasako, Toshihiro Shinohara, Keiji Kawanishi, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 132(11), 1749 - 1755, 2012 , RefereedSummary: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.
- Range and velocity estimation based on phase interference of subband-divided and time-delayed impulse sound to a moving target, Masato Nakayama, Yuma Neki, Noboru Nakasako, Toshihiro Shinohara, Tetsuji Uebo, Takanobu Nishiura, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 132(11), 1774 - 1775, 2012 , RefereedSummary: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.
- A Trial Implementation of a Distance Estimation Method Based on Standing Waves of Audible Sound, Norimitsu Ohmata, Tetsuji Uebo, Noboru Nakasako, Toshihiro Shinohara, ELECTRICAL ENGINEERING IN JAPAN, ELECTRICAL ENGINEERING IN JAPAN, 177(2), 41 - 48, Nov. 2011 Summary: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
- A study of acoustic distance measurement method based on phase interference using synchronous subtraction processing, Masato NAKAYAMA, Shimpei HANABUSA, Noboru NAKASAKO, Toshihiro SHINOHARA, Tetsuji UEBO, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J94-A(8), 676 - 679, Aug. 2011 , Refereed
- Three-dimensional sound field reproduction method based on acoustic distance measurement method using near loudspeakers on the right and left sides, Masato NAKAYAMA, HIROHATA Kazuki, Noboru NAKASAKO, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J94-A(5), 313 - 322, May 2011 , Refereed
- Robust acoustic distance measurement method based on synchronous addition and spectral subtraction in noisy environments, Masato Nakayama, Shimpei Hanabusa, Noboru Nakasako, Toshihiro Shinohara, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 131(11), 1864 - 1870, 2011 , RefereedSummary: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.
- Distance estimation using audible sound --Principle of distance estimation based on standing wave, Noboru NAKASAKO, Tetsuji UEBO, Toshihiro SHINOHARA, SYSTEMS, CONTROL AND INFORMATION, SYSTEMS, CONTROL AND INFORMATION, 54(8), 314 - 319, Aug. 2010
- Distance Estimation to Multiple Targets Using Band-Limited Noise Signal, Tetsuji Uebo, Noboru Nakasako, Norimitsu Ohmata, Hanae Itagaki, ELECTRONICS AND COMMUNICATIONS IN JAPAN, ELECTRONICS AND COMMUNICATIONS IN JAPAN, 93(7), 53 - 60, Jul. 2010 Summary: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
- Fundamental consideration on distance estimation based on interference between transmitted and reflected sound, Noboru Nakasako, Toshihiro Shinohara, Atsushi Mori, Tetsuji Uebo, The Jounal of the INCE (Institute of Noise Control Engineers) of Japan, The Jounal of the INCE (Institute of Noise Control Engineers) of Japan, 34(2), 186 - 194, Apr. 2010 , Refereed
- Talker localization based on interference between transmitted and reflected audible sound, Masato Nakayama, Noboru Nakasako, Toshihiro Shinohara, Tetsuji Uebo, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 130(11), 14 - 2000, 2010 , RefereedSummary: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.
- Distance estimation based on interference of audile linear chirp signal, Shimpei Hanabusa, Tetsuji Uebo, Yuuta Tsuchida, Toshihiro Shinohara, Noboru Nakasako, IEEJ transactions on electronics, information and systems, IEEJ transactions on electronics, information and systems, 129(11), 2027 - 2033, Nov. 2009 , Refereed
- A Study of Prosodic Features of Emotional Speech Based on the Auditory Impressions, Memoirs of the School of Biology-Oriented Science and Technology of Kinki University, Memoirs of the School of Biology-Oriented Science and Technology of Kinki University, (23), 1 - 14, Mar. 2009 , Refereed
- A trial on implementation of distance estimation method based on standing wave of audible sound, Norimitsu Ohmata, Tetsuji Uebo, Noboru Nakasako, Toshihiro Shinohara, IEEJ Transactions on Electronics, Information and Systems, IEEJ Transactions on Electronics, Information and Systems, 129(2), 18 - 319, 2009 , RefereedSummary: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.
- Distance estimation to multiple targets using band-limted noise signal, T. Uebo, N. Nakasako, N. Ohmata, H. Itagaki, IEEJ transactions on electronics, information and systems, IEEJ transactions on electronics, information and systems, 128(7), 1117 - 1122, Jul. 2008 , Refereed
- EEG analysis based on Independent Component Anlaysis and positive time-frequency distribution, N. Nakasako, H. Yoshida, N. Yamawaki, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, (19), 23 - 35, Apr. 2007 , Refereed
- Evaluation of Emotions for Music Sounds with Different Tones Based on Emotional Spectrum Analysis Method Using Brain Waves, 29, 1 - 8, Dec. 2005
- A Practical Countermeasure to Wind-induced Noise in Environmental Noise Measurement Based on Linear and/or Non-linear Model Using Wind Speed Information, Noboru Nakasako, Koichi Sakamoto, Hitoshi Itoh, Yoshiaki Takakuwa, Memories of the School of Biology-oriented Science and Technology of Kinki University, Memories of the School of Biology-oriented Science and Technology of Kinki University, (16), 19 - 28, Oct. 2005 , Refereed
- Fundamental study on sound source localization and restoration Introduction of blind source separation and inverse filtering（Invited paper）, N.Nakasako, H. Ogura, Y. Sakuma, Proc. 32nd International Congress and Exposition on Noise Control Engineering, Proc. 32nd International Congress and Exposition on Noise Control Engineering, 1478 - 1485, Aug. 2003
- Fundamentals of independent component analysis（ICA）and acoustic signal processing, Noboru NAKASAKO, Hisanao OGURA, SYSTEMS, CONTROL AND INFORMATION, SYSTEMS, CONTROL AND INFORMATION, 46(7), 400 - 408, Jul. 2002
- Identification and probabilistic response prediction methods of actual sound insulation systems contaminated by unknown background noise, N. Nakasako, M. Ohta, J. Acoust. Soc. Jpn. (E), J. Acoust. Soc. Jpn. (E), 19(2), 113 - 120, Mar. 1998 , Refereed
- A probabilistic evaluation method of output response based on the extended regression analysis method for sound insulation systems with roughly observed data, N. Nakasako, M. 0hta, Y. Mitani, IEICE Trans. Fundamentals, IEICE Trans. Fundamentals, E80-A(10), 1410 - 1416, Oct. 1997 , Refereed
- A digital filter of restoring the stochastic signal from noisy and quntized observations, Noboru NAKASAKO, Mitsuo OHTA, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J79-A(5), 1013 - 1021, May 1996 , Refereed
- An extended evaluation method of non-Gaussian type sound envirenment utilizing the generalized capability in the parallel information processing of neural network and fuzzy probability, hta, A. Ikuta, N. Nakasako, 51(4), 299 - 306, Apr. 1995 , Refereed
- The transformation relationship of dual direction type among noise evaluation indices L_x's based on an improvement of the principal component analysis method, Mitsuo Ohta, Noboru Nakasako, Yasuo Mitani, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 50(10), 829 - 835, Oct. 1994 , Refereed
- A pratical regression analysis method based on the information criterion and its application to the actual acoustic system, Yasuo Mitani, Mitsuo Ohta, Noboru Nakasako, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 50(5), 353 - 360, May 1994 , Refereed
- A study on the reverberation process from a view-point of the temporal transition of probability distribution information : An establishment of theory and its experiment, Mitsuo Ohta, Noboru Nakasako, Kazutatsu Hatakeyama, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 47(9), 639 - 646, Sep. 1991 , Refereed
- New methodological trials of evaluating the sound intensity fluctuations at three observation points with arbitrary correlation in a diffuse sound fie1d, M. 0hta, N. Nakasako, K. Hatakeyama, ACUSTICA, ACUSTICA, 74(4), 242 - 253, Sep. 1991 , Refereed
- Various stochastic properties of correlative fluctuation at arbitrary K observation points in a diffuse sound field : Establishment of theory and experiment, Mitsuo Ohta, Noboru Nakasako, Yasu Sato, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 47(8), 545 - 553, Aug. 1991 , Refereed
- A stochastic evaluation method for the arbitary memory-type acoustic system with a non-linear observation and its application to the room acoustics-Continued report, Mitsuo Ohta, Noboru Nakasako, Kazumasa Nakamura, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 47(1), 13 - 20, Jan. 1991 , Refereed
- Unification of various type expressions for probability distribution of arbitrary random noise and vibration waves based on their fluctuation ranges (theory and experiment), M. 0hta, N. Nakasako, Y. Xiao, Archives of Acoustics, Archives of Acoustics, 15(3-4), 399 - 416, Apr. 1990 , Refereed
- The relation between mutual correlation and probability distribution for sound intensity fluctuations at two observation points in a diffuse sound field : Two methods of evaluating their correlation, Mitsuo Ohta, Noboru Nakasako, Kazumasa Nakamura, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 45(4), 255 - 262, Apr. 1989 , Refereed
- A background noise correction method based on the dynamical state estimation algorithm for the actually observed data with arbitrary amplitude constraint, N. Nakasako, M, hta, B, Soenarko, Singapore Journal of Physics, Singapore Journal of Physics, 6(1), 137 - 144, Apr. 1989 , Refereed
- Spatilal coorelation and probabilistic evaluation of fluctuations at two observation points in a diffuse sound field, Mitsuo OHTA, Noboru NAKASAKO, IEICE Trans. Fundamentals(Japanese Edition), IEICE Trans. Fundamentals(Japanese Edition), J71-A(11), 1999 - 2008, Nov. 1988 , Refereed
- Several Type Practical Methods for Evaluating a Spatial Correlation of Sound Intensity Fluctuations in a Diffuse Sound Field, Mitsuo Ohta, Naomitsu Takaki, Noboru Nakasako, The Jounal of the INCE (Institute of Noise Control Engineers) of Japan, The Jounal of the INCE (Institute of Noise Control Engineers) of Japan, 12(1), 35 - 40, Feb. 1988 , Refereed
- An identification method for arbitrary sound insulation walls under the background noise and the prediction of output probability : A practical algorithm based on a time series model, Mitsuo Ohta, Akira Ikuta, Noboru Nakasako, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 43(11), 837 - 844, Nov. 1987 , Refereed
- A dynamical state estimation method based on the non-linear mixed stochastic model in room acoustics, M. Ohta, N. Nakasako, K. Hatakeyama, ACUSTICA, ACUSTICA, 62(2), 123 - 130, Nov. 1986 , Refereed
- An evaluation theory of nonstationarity for the stochastic noise or vibration based on a temporal change of mean and variance and its application to the road traffic noise, Mitsuo OHTA, Noboru NAKASAKO, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 42(2), 102 - 112, Feb. 1986 , Refereed
- A simplified evaluation method for nonstationary Gaussian random process, N. Nakasako, Acoustics Letter, Acoustics Letter, 12(8), 199 - 202, Aug. 1985 , Refereed
- A probabilistic theory for the non-linear evaluation of arbitrary mixed model type acoustic systems and a probablistic evaluation of fluctuating Leq, Mitsuo Ohta, Hiroshi Yamada, Noboru Nakasako, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 41(4), 221 - 229, Apr. 1985 , Refereed
- An identification and probabilistic prediction of arbitrary stochastic acoustic systems based on the regression model, Mitsuo OHTA, Noboru NAKASAKO, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 41(1), 13 - 20, Jan. 1985 , Refereed
- A statistical evaluation method on the acuity of wave form for random noise and vibration : Level crossing,peak and trough, Mitsuo Ohta, shoji Oki, Noboru Nakasako, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, 40(2), 87 - 94, Feb. 1984 , Refereed
- A Study on Acoustic Beam Steering with Parametric Loudspeaker Based on Individual Delay-filtering for Carrier and Sideband Waves, Masato Nakayama, Takanobu Nishiura, Ryota Okuno, Noboru Nakasako, 2014 IEEE ASIA PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS (APCCAS), 2014 IEEE ASIA PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS (APCCAS), 447 - 450, 2014 , RefereedSummary: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.
- A Prototype of BCI-Robot Arm System with 1ch Acoustic Distance Measurement Device, Nobuyuki Yamawaki, Noboru Nakasako, Tatuya Nishimae, Toshihiro Shinohara, Masato Nakayama, Daichi Yoshida, 2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS), 2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS), 336 - 339, 2013 , RefereedSummary: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.
- Fundamental Consideration on 1ch Acoustic Distance Measurement Method Based on Phase Interference by Considering the Movement of Transmitting-and-Receiving System, Noboru Nakasako, Tatuya Nishimae, Toshihiro Shinohara, Nobuyuki Yamawaki, Masato Nakayama, Tetsuji Uebo, 2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS), 2013 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS), 332 - 335, 2013 , RefereedSummary: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.
- ACOUSTIC DISTANCE MEASUREMENT BASED ON PHASE INTERFERENCE USING THE CROSS-SPECTRAL METHOD WITH ADJACENT MICROPHONES, Masato Nakayama, Kazuhiro Suzuki, Noboru Nakasako, 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), 423 - 427, 2013 , RefereedSummary: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.
- Acoustic distance measurement method based on phase interference using the cross-spectral method, Masato Nakayama, Noboru Nakasako, Tetsuji Uebo, Manabu Fukushima, Acoustical Science and Technology, Acoustical Science and Technology, 34(3), 197 - 205, 2013 , RefereedSummary: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.
- Multiple-nulls-steering beamformer based on both talker and noise direction-of-arrival estimation, Masato Nakayama, Takanobu Nishiura, Yoichi Yamashita, Noboru Nakasako, Acoustical Science and Technology, Acoustical Science and Technology, 34(2), 80 - 88, 2013 , RefereedSummary: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.
- Acoustic Distance Measurement Method Based on Phase Interference Using Calibration and Whitening Processing in Real Environments, Masato Nakayama, Shimpei Hanabusa, Tetsuji Uebo, Noboru Nakasako, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E94A(8), 1638 - 1646, Aug. 2011 , RefereedSummary: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.
- Distance measurement based on standing wave for band-limited audible sound with random phase, Tetsuji Uebo, Noboru Nakasako, Norimitsu Ohmata, Atsushi Mori, Acoustical Science and Technology, Acoustical Science and Technology, 30(1), 18 - 24, 2009 , RefereedSummary: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.
- Fundamental consideration on distance estimation using acoustical standing wave, Noboru Nakasako, Tetsuji Uebo, Atsushi Mori, Norimitsu Ohmata, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E91A(4), 1218 - 1221, Apr. 2008 , RefereedSummary: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.
- A consideration on sound reduction property in one-dimensional random duct, Noboru Nakasako, Hisanao Ogura, Aya Ishikawa, Acoustical Science and Technology, Acoustical Science and Technology, 26(4), 374 - 377, Jul. 2005 , RefereedSummary: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.
- Simplified determination for the order of series type probability expression under introducing tolerance range and its application to traffic noise, Noboru Nakasako, Mitsuo Ohta, Acoustical Science and Technology, Acoustical Science and Technology, 22(5), 358 - 363, 2001 , RefereedSummary: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.
- A fundamental consideration on the stochastic blind signal separation based on the rotational transformation and a measure of statistical independency, Noboru Nakasako, Hisanao Ogura, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 21(1), 49 - 52, 2000 , Refereed
- Practical and probabilistic evaluation method of sound insulation systems based on the extended regression analysis for roughly observed data, Noboru Nakasako, Yasuo Mitani, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 19(6), 391 - 396, 1998 , RefereedSummary: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.
- A fundamental study on the statistical evaluation of receiver response for an electromagnetic wave environment in multi-dimensional signal space - Theory and basic experiment, M Ohta, Y Mitani, N Nakasako, JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, 12(5), 677 - 699, 1998 , RefereedSummary: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 prediction method of non-stationary time series data by using a modular structured neural network, E Watanabe, N Nakasako, Y Mitani, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E80A(6), 971 - 976, Jun. 1997 , RefereedSummary: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 state estimation method in acoustic environment based on fuzzy observation contaminated by background noise - Utilization of inverse probability and digital filter, A Ikuta, M Ohta, N Nakasako, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E80A(5), 825 - 832, May 1997 , RefereedSummary: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.
- Precise estimation method of probability distribution based on roughly observed data with quantized level and its application to environmental sound noise measurement, Yasuo Mitani, Noboru Nakasako, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 18(4), 183 - 190, 1997 , RefereedSummary: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.
- A probabilistic evaluation method of discriminating system characteristics from background noise by use of multi-output observations in a complicated sound environment, N Nakasako, M Ohta, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E79A(8), 1252 - 1255, Aug. 1996 , RefereedSummary: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 practical method of predicting Leq by use of Lx data for road traffic noise based on the introduction of probabilistic neural networks, Noboru Nakasako, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 17(1), 27 - 32, 1996 , RefereedSummary: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.
- STOCHASTIC SIGNAL-DETECTION FROM A SATURATED NOISY OBSERVATION AND ITS APPLICATION TO ROOM ACOUSTICS, M OHTA, N NAKASAKO, JOURNAL OF SOUND AND VIBRATION, JOURNAL OF SOUND AND VIBRATION, 176(2), 209 - 224, Sep. 1994 , RefereedSummary: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.
- STOCHASTIC SIGNAL-PROCESSING FOR INCOMPLETE OBSERVATIONS UNDER THE AMPLITUDE LIMITATIONS IN INDOOR AND OUTDOOR SOUND ENVIRONMENTS BASED ON REGRESSION-ANALYSIS, N NAKASAKO, M OHTA, H OGAWA, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E77A(8), 1353 - 1362, Aug. 1994 , RefereedSummary: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.
- A PRACTICAL TRIAL OF DYNAMICAL STATE ESTIMATION FOR NON-GAUSSIAN RANDOM VARIABLE WITH AMPLITUDE LIMITATION AND ITS APPLICATION TO THE REVERBERATION TIME MEASUREMENT, N NAKASAKO, M OHTA, Y MITANI, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E76A(9), 1392 - 1402, Sep. 1993 , RefereedSummary: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
- DISCRETE-TIME MODELING AND DIGITAL SIGNAL-PROCESSING FOR A PARAMETER-ESTIMATION OF ROOM ACOUSTIC SYSTEMS WITH NOISY STOCHASTIC INPUT, M OHTA, N NAKASAKO, K HATAKEYAMA, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E75A(11), 1460 - 1467, Nov. 1992 , RefereedSummary: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.
- Generalization of Rician distribution for speckle pattern in ultrasound image processing and random flights problem in Shannon's signal space, Mitsuo Ohta, Shigeharu Miyata, Noboru Nakasako, Journal of the Acoustical Society of Japan (E), Journal of the Acoustical Society of Japan (E), 13(2), 101 - 113, 1992 , RefereedSummary: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.
- THE RANDOM-WALK PROBLEM IN N-DIMENSIONAL SIGNAL SPACE AND STOCHASTIC ACOUSTIC INFORMATION-PROCESSING - INTRODUCTION OF A HANKEL TRANSFORM TYPE OF CHARACTERISTIC FUNCTION AND ROOM ACOUSTICS, M OHTA, N NAKASAKO, ACUSTICA, ACUSTICA, 74(1), 23 - 40, Jun. 1991 , RefereedSummary: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.
- AN EVALUATION THEORY FOR A MIXED MODEL STOCHASTIC-SYSTEM AND ITS APPLICATION TO NONSTATIONARY ROAD TRAFFIC NOISE, M OHTA, N NAKASAKO, ACUSTICA, ACUSTICA, 71(2), 121 - 126, Jun. 1990 , Refereed
- NEW METHODOLOGICAL TRIALS OF ESTIMATING THE SOUND POWER LEVEL IN A ROOM BASED ON STOCHASTIC INFORMATION-PROCESSING, M OHTA, N NAKASAKO, K KITOH, ACUSTICA, ACUSTICA, 70(4), 292 - 296, Apr. 1990 , Refereed
- A DYNAMICAL IDENTIFICATION METHOD BASED ON CONDITIONED OBSERVATIONS FOR A SOUND INSULATION SYSTEM WITH THE ORDER DETERMINED BY A NEW CRITERION INDEX, M OHTA, K HATAKEYAMA, A IKUTA, JOURNAL OF SOUND AND VIBRATION, JOURNAL OF SOUND AND VIBRATION, 127(2), 253 - 270, Dec. 1988 , Refereed
- THE PROBABILISTIC EVALUATION OF DISCRETE LEVEL TYPE FOR A SOUND-TRANSMISSION THROUGH THE DOUBLE-WALL BY USE OF A STATISTICAL ENERGY ANALYSIS METHOD, M OHTA, H IWASHIGE, N NAKASAKO, ACUSTICA, ACUSTICA, 64(1), 1 - 13, Jul. 1987 , Refereed
- A STOCHASTIC-THEORY ON THE BACKGROUND-NOISE CORRECTION CONSIDERED AS AN EQUIVALENT NONLINEAR FEEDBACK-SYSTEM WITH DIGITIZED LEVEL OBSERVATIONS AND ITS EXPERIMENTS, M OHTA, Y FUJITA, N NAKASAKO, B ZHANG, ACUSTICA, ACUSTICA, 63(3), 191 - 202, May 1987 , Refereed
- A PREDICTION METHOD OF THE RESPONSE PROBABILITY-DISTRIBUTION FOR ARBITRARY SOUND INSULATION SYSTEMS, N NAKASAKO, M OHTA, S KUWAHARA, APPLIED ACOUSTICS, APPLIED ACOUSTICS, 22(2), 103 - 115, 1987 , Refereed
- A NEW EVALUATION METHOD ON THE SOUND-TRANSMISSION LOSS OF GENERAL N-FOLD WALL BY USE OF A MODIFIED STATISTICAL ENERGY ANALYSIS METHOD, M OHTA, H IWASHIGE, N NAKASAKO, ACUSTICA, ACUSTICA, 61(2), 105 - 115, Aug. 1986 , Refereed
- Two probabilistic evaluation methods for single and double walls type sound insulation systems with arbitrary random noise excitation, Mitsuo Ohta, Noboru Nakasako, Journal of the Acoustical Society of Japan (E), Journal of the Acoustical Society of Japan (E), 7(6), 335 - 342, 1986 , RefereedSummary: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.
- A practical probabilistic evaluation method for actually complicated insulation systems based on linear and/or non-linear regression models between observed input and output data of the system, Mitsuo Ohta, Noboru Nakasako, Journal of the Acoustical Society of Japan (E), Journal of the Acoustical Society of Japan (E), 6(2), 127 - 134, 1985 , RefereedSummary: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.
- A NEW METHODOLOGICAL TRIAL ON PROBABILISTIC PREDICTION OF ROAD TRAFFIC NOISE BASED ON THE GROUPING MODEL OF POISSON-TYPE TRAFFIC-FLOW, M OHTA, K NAKAMURA, N NAKASAKO, ACUSTICA, ACUSTICA, 58(1), 39 - 47, 1985 , Refereed
- A TRIAL OF PROBABILISTIC EVALUATION FOR THE SOUND INSULATION SYSTEM BASED ON THE MODIFIED METHOD OF STATISTICAL ENERGY ANALYSIS, M OHTA, S YAMAGUCHI, N NAKASAKO, ACUSTICA, ACUSTICA, 56(4), 270 - 279, 1984 , Refereed
- A new trial of estimating the equivalent characteristic of sound propagation for the actual road traffic noise field based on the mixing model of two idealized propagation environments, Mituo Ohta, Noboru Nakasako, Akira Ikuta, Journal of the Acoustical Society of Japan (E), Journal of the Acoustical Society of Japan (E), 4(4), 189 - 202, 1983 , RefereedSummary: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.

- Higher-order Statistical Signal Pocessing, E. Uchino, M. 0hta, H. Minamihara, N. Nakasako, B, Boashash, E. J. Powers, A. M. Zoubir, Contributor, Chap. 5, pp.151-177, Longman, Melbourne, 1995 07
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- 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, T. Nakano, T. Shinohara, T. Uebo, M. Nakayama, N. Nakasako, 2016 09 01
- 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, 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
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- A trial on calculating the equivalent reflection coefficient by acoustic distance measurement method based on phase interference in actual field, NEKI Yuma, 2014 03 10
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- A basic study to manipulate volume data of brain blood vessel using its position and diameter, 2013 01
- Estimation of Center Line and Diameter of Blood Vessel by Vessel Tracing with Sequenctially Binarized Head CTA Image, 2013 01
- Estimation of Centerline and Diameter of Brain Vessel in 3D Head CTA Image by Using Model Matching Method, International Forum on Medical Imaging in Asia, 2012 11 , International Forum on Medical Imaging in Asia
- 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, 2012 08
- A Simplified Estimation Method for Environmental Noises Using Independent Component Analysis, 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, 2012 05
- A study of acoustic distance measurement method based on interference of speech presented by a dialogue system in real environments, 2012 05
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- Estimation of Center Line and Diameter of Blood Vessel by Vessel Tracing with Simple Binarized Head CTA Image, 2012 01
- A experimental study of acoustic distance measurement based on cross-spectral method using 2-channel microphones, 2012 01
- Distance measurement method measurable from 0m based on power spectrum fluctuation of the interference sound for 1ch observations, 2011 11
- 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, 2011 09
- A study of the acoustic distance measurement method measurable from 0m based on phase of range spectrum, 2011 09
- An experimental study of the effects of both reflection coefficient and distance decay in the acoustic distance measurement method based on interference, 2011 09
- A fundamental study of the acoustic measurement method based on interference considering the movement of the loudspeaker and microphone, 2011 09
- Estimation of distance from sound source using single microphone based on interference between transmitted and reflected waves, 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, 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
- Development the three-dimensional pointing device by single camera using ARToolKit to support the brain blood vessel disease diagnosis, 2011 08
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- 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, 2011 03
- Acoustic tracking method based on interference for a moving object - a fundamental study with linear chirp signal -, 2011 03
- A study of acoustic distance measurement method based on phase interference of computer-emitted speech using phoneme segmentation, 2011 03
- A study of object localization based on a two-channel acoustic distance measurement method using a transmitted sound with high frequency components, 2011 03
- Acoustic distance measurement method based on phase interference using linear chirp signal ―A trail on tracking of a moving object―, 2011 01
- 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, 2010 11
- Robust Acoustic Distance Measurement Method Based on Interference in Noisy Environments, The 2010 International Symposium on Communications and Information Technologies (ISCIT2010), 2010 10 , 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, The 2010 International Symposium on Communications and Information Technologies (ISCIT2010), 2010 10 , The 2010 International Symposium on Communications and Information Technologies (ISCIT2010)
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- Three-dimensional sound field reproduction method based on acoustic distance measurement using near loudspeakers -- a study of a sound quality and its correction method--, 2010 09
- A study of acoustic distance measurement method based on interference by using subtraction of known signals, 2010 09
- A fundamental study of acoustic distance measurement method based on interference of a transmitted wave having a time width to a moving object, 2010 09
- A consideration on 2-channel acoustic distance estimation method measurable from 0m based on phase interference, 2010 09
- A study of talker localization method by combining a two-channel acoustic distance measurement method and a CSP method, 2010 09
- Estimation of Center Line and Diameter of Brain Blood Vessel Using Three-dimensional Blood Vessel Matching Method with Head Three-dimensional CTA, 2010 08
- Fundamental study on distance estimation using audible sound for aiming to analyze an ability of reading a sign of surrounding objects, 2010 05
- A study of three dimensional sound field reproduction based on distance estimation using near loudspeaker on the right and left sides, 2010 05
- A trial of distance estimation to a subject with speech (based on standing wave theory), 2010 03
- A study of distance estimation based on interference of audible sound for a moving object, 2010 03
- Estimation of distance from sound source using single microphone based on interference between transmitted and reflected audible sound (utilization of duplicative reflection), 2010 03
- Distance estimation method measurable from 0m using a standing wave of audible sound -- Utilization of band-limited Gaussian noise --, 2010 01
- 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---, 2009 11
- Correction Method of Estimated Distance Using Geometrical Information on Sound Source and Microphone, 2009 Asia-Pacific Signal and Information Processing Association, Annual Summit and Conference, 2009 10 , 2009 Asia-Pacific Signal and Information Processing Association, Annual Summit and Conference
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- 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), 2009 09
- Distance Estimation and Compensation Method Using Band-limited Transmitted Wave with Uniform Amplitude and Random Phase Characteristics, The 24th International Technical Conference on Circuits/Systems, Computers and Communications, 2009 07 , The 24th International Technical Conference on Circuits/Systems, Computers and Communications
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- A study of talker localization based on distance estimation using the standing wave and microphone array, 2009 03
- 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), 2009 03
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- Fundamental consideration on distance estimation based on interference between transmitted and reflected sound, 2007 11
- Distance estimation based on standing wave of audible sound under a pulse input (Comparison with Cepstrum analysis), 2007 09
- On distance measurement using band-limited noise, SICE Annual Conference 2007, 2007 09 , SICE Annual Conference 2007
- Distance estimation to targets using band-limted signal, 2007 09
- Distance estimation using standing wave with impusive sound, 2007 08
- Distance measurement by audible sound (Utilization of band-limited signal with random phase), The China-Japan Joint Conference of Acoustics 2007 (JCA2007), 2007 06 , The China-Japan Joint Conference of Acoustics 2007 (JCA2007)
- Simplified estimation method for environmental noises using Independent Component Analysis, 2007 05
- Distance measurement to targets using audible sound (Possilbility of utilization of standing wave), 2007 05
- Distance measurement by audible sound (Experimental consideration using band-limited noise), 2007 03
- Distance estimation using standing wave for audible sound (Fundamenal experiment with impulse input), 2007 03
- Sound reduction property of one-dimensional duct with random loadings, The 35th International Congress and Exposition on Noise Control Engineering (Inter-noise 2006), 2006 12 , The 35th International Congress and Exposition on Noise Control Engineering (Inter-noise 2006)
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- A trial to song searchin system considerinag individual vocal range, 2006 11
- A trial of analyzing an acoustic signal by time-frequency distrubution -- Introduction of Copula-based positive time-frequency distribution --, 2006 09
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- 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--, 13th International Congress on Sound and Vibration (ICSV13), 2006 07 , 13th International Congress on Sound and Vibration (ICSV13)
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- Blind Separation for 3 Signals in Terms of Complex Hermite Moment and 3-dimensional Unitary Transformation, 2005 03
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- On the ANC in one-dimensional duct and the filter design for control, 2003 11
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- On active noise control for one-dimensional sound field based on equivalent circuit model, 2003 09
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- Distance Estimation and Compensation Method Using Band-limited Transmitted Wave with Uniform Amplitude and Random Phase Characteristics, 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
- Identification of sound source position or direction based on the statistical independency in an actual sound environment（Project No. : 13650472）, 1, 65, 2003 03
- TRIAL OF ESTIMATING DISTANCE BASED ON THE INTERFERENCE OF AN AUDIBLE CHIRP, Noboru Nakasako, Yuta Tsuchida, Toshihiro Shinohara, Tetsuji Uebo, PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS, 2016 Summary:The distance to a target is fundamental information in many engineering applications, and an acoustical signal, especially an ultrasonic sound, often plays an essential role in measuring such a distance. Many proposed methods for measuring distance use the time delay between the transmitted and reflected waves, but it is difficult to measure short distances when the reflected waves are buried in the transmitted wave. Recently, a method to measure short distances using standing wave in the research field of microwave was proposed by T. Uebo et al. We applied the fundamental principles of that method to the estimation of short distances when using audible sound as the transmitted wave. This enables us to obtain the range spectrum from the power spectrum of the composite sound and to measure either short- or long-range distances, but it requires two applications of the Fourier transform. We propose a method for estimating distance that uses a chirp (a signal in which the frequency changes over time) as the transmitted wave, because the period of the power fluctuation of the composite sound will be inversely proportional to the distance between the microphone and the target. We confirmed the validity of the chirp -based distance estimate by performing a computer simulation and by applying it to an actual sound field.
- A TRIAL OF ACOUSTICAL DISTANCE MEASUREMENT BASED ON PHASE INTERFERENCE USING AN ULTRASONIC SOUND, Tomofumi Nakano, Toshihiro Shinohara, Tetsuji Uebo, Noboru Nakasako, Masato Nakayama, PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS, 2016 Summary:In order to achieve the realistic sensation of sound, sound field reproduction technique plays a very important role. The sound field reproduction technology is roughly classified into binaural and transaural reproduction systems. The former has a merit that it can be implemented in small scale systems under the assumption of the headphone listening but it is somewhat burdensome to wear the headphone. Although the latter does not require headphones, it requires large scale system to reproduce the sound field. In this paper, we focus on the development of small scale sound reproduction system. If the distance between sound source and listener is a priori known, it may be possible to reproduce the sound field more accurately. As a method of distance estimation for a target, acoustical distance measurement (ADM) was proposed based on phase interference using audible sound. However, measurement of audible sound has the potential to record private information such as conversation, which may yield a privacy issue. There is a reproduction method of sound field by parametric loudspeaker using ultrasonic sound. Therefore, in order to reproduce sound field more accurately, protecting personal conversation from the sound measurement, this paper describes a new method to estimate the distance using an ultrasonic wave. This acoustic distance measurement is based on interference between direct wave and reflected wave using ultrasonic wave. First, the composite wave of direct wave and reflected wave is observed, and then the power spectrum of the composite wave is obtained by Fourier transform. The power spectrum of composite wave is a periodical function whose period is inversely proportional to the distance between microphone and target. Finally, by applying Fourier transform again to the power spectrum, the range spectrum is obtained, whose peak position corresponds to the distance. To confirm the effectiveness of the proposed method, it is applied to the actual situation of distance measurement by using ultrasonic sound.
- ESTIMATING THE DISTANCE TO A SOUND SOURCE, USING SINGLE-CHANNEL CROSS-SPECTRAL METHOD BETWEEN OBSERVED AND PSEUDO-OBSERVED WAVES BASED ON PHASE INTERFERENCE, Shinya Honda, Toshihiro Shinohara, Tetsuji Uebo, Noboru Nakasako, PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS, 2016 Summary:In acoustic applications, it is often important to estimate the distance to the sound source. The conventional way to estimate the distance to the target is based on the time delay between the transmitted and reflected waves, but this method cannot be used when the reflected wave is buried in the transmitted wave. Thus, a method has been proposed that uses the interference between the transmitted and reflected waves to estimate the distance to the target. In an existing method for measuring acoustic distance based on phase interference, it has been shown that a spurious peak appears in the range spectrum (which is the absolute value of the Fourier transform of the power spectrum; the position of its peak corresponds to the distance). The spurious peak is caused by the measuring system from the loudspeaker to the microphone. To remove the effect of the measuring system, a single-channel cross-spectral analysis was applied to the observed wave and a pseudo observed wave, which was the result of convolving the transmitted wave with the impulse response of the measuring system, as measured in advance. We note that attaching a microphone to a target causes multiple reflections (interference between the sound source and the target). Thus, in this paper, we propose a method based on the phase interference to estimate the distance between a sound source and a target, using single-channel cross-spectral analysis of the observed wave and a pseudo-observed wave. We also present the results of applying the proposed method to estimating the distance to the source of a sound (human voice).
- Robust acoustic distance measurement method based on interference in noisy environments, Masato Nakayama, Shimpei Hanabusa, Noboru Nakasako, Tetsuji Uebo, ISCIT 2010 - 2010 10th International Symposium on Communications and Information Technologies, 176, 181, 2010 , 10.1109/ISCIT.2010.5664833, http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=78651225530&origin=inwardSummary:Distance to target is fundamental and very important information in many engineering fields. Many distance measurement methods with sound utilize the time delay of reflected wave which is measured with reference to transmitted one. 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. Therefore we proposed acoustic distance measurement method based on interference between transmitted wave and reflected waves, which could measure distance in short range. However, the performance of our method was not discussed in noisy environments. In this paper, we focus discussion on noisy environments with additive noise. We describe our method using real measuring system in noisy environments. In addition, we propose suitable noise reduction for our method by applying an idea of synchronous addition and spectral subtraction in noisy environments. Finally, we confirm the effectiveness of our method using noise reduction through simulation and experiment. As a result, it has been confirmed that the distance can be measured at SNR = 5 or 15 dB by our method without using noise reduction and can be measured at SNR = -5 to 5 dB by our method using noise reduction. ©2010 IEEE.
- On distance measurement using band-limited noise, Noboru Nakasako, Tetsuji Uebo, Norimitsu Ohmata, Atsushi Mori, PROCEEDINGS OF SICE ANNUAL CONFERENCE, VOLS 1-8, 151, 156, 2007 , 10.1109/SICE.2007.4420968, http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=50249102636&origin=inwardSummary:In many engineering fields, distance to target is fundamental and very important information, and often estimated or measured by using sound. To measure the distance to the target, time delay between reflected wave from transmitted wave is often used. However, it is difficult to measure short distance. Actually, ultrasonic range finders and ultrasonic level meters have minimum detectable range. Meanwhile, in the research field of microwave radar, a range finding method using standing wave is known for measuring short distances. It seems effective to use the standing wave of sound wave for measuring short distances. Moreover, in an actual situation of acoustic measurement, a random noise is very often utilized as well as a pure tone. Therefore, we focus our attention on audible sound and examine the distance estimation method using standing wave in audible sound. Specifically, we perform a computer simulation when audible sound, e.g., white noise, is used as a transmitted wave.
- Simplified determination for the order of series type probability expression under introducing tolerance range and its application to traffic noise(jointly worked), Acoust. Sci. & Tech., Vol.22, No.5, pp.358-363, 2001 , 10.1250/ast.22.358
- A fundamental consideration on the stochastic blind signal separation based on the rotational transformation and a measure of statistical independency, 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 , 10.1250/ast.21.49
- Practical and probabilistic evaluation method of sound insulation systems based on the extended regression analysis for roughly observed data, 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 , 10.1250/ast.19.391Summary: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.
- A fundamental study on the statistical evaluation of receiver response for an electromagnetic wave environment in multi-dimensional signal space - Theory and basic experiment, M Ohta, Y Mitani, N Nakasako, JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, 12, 5, 677, 699, 1998 Summary: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.
- Identification and probabilistic response prediction methods for actual sound insulation systems contaminated by background noise, Noboru Nakasako, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 19, 2, 113, 120, 1998 , 10.1250/ast.19.113Summary: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.
- A probabilistic evaluation method of output response based on the extended regression analysis method for sound insulation systems with roughly observed data, N Nakasako, M Ohta, Y Mitani, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E80A, 8, 1410, 1416, 1997 08 Summary:In this paper, a new trial for the signal processing is proposed along the same line as a previous study on the extended regression analysis based on the Bayes' theorem. This method enables us to estimate a response probability property of complicated systems in an actual case when observation values of the output response are roughly observed due to the quantization mechanism of measuring equipment. More concretely, the main purpose of this research is to find the statistics of the joint probability density function before a level quantization operation which reflects every proper correlation informations between the system input and the output fluctuations. Then, the output probability distribution for another kind of in put is predicted by using the estimated regression relationship. Finally, the effectiveness of the proposed method is experimentally confirmed by applying it to the actually observed input-output data of the acoustic system.
- A prediction method of non-stationary time series data by using a modular structured neural network, E Watanabe, N Nakasako, Y Mitani, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E80A, 6, 971, 976, 1997 06 Summary: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 state estimation method in acoustic environment based on fuzzy observation contaminated by background noise - Utilization of inverse probability and digital filter, A Ikuta, M Ohta, N Nakasako, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E80A, 5, 825, 832, 1997 05 Summary: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.
- Precise estimation method of probability distribution based on roughly observed data with quantized level and its application to environmental sound noise measurement, 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 , 10.1250/ast.18.183Summary: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.
- A probabilistic evaluation method of discriminating system characteristics from background noise by use of multi-output observations in a complicated sound environment, N Nakasako, M Ohta, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E79A, 8, 1252, 1255, 1996 08 Summary: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 Processing from Noisy and Quantized Level Observations, Trans.IEICE A, J79-A, 5, 1013, 1996
- A practical method of predicting Leq by use of Lx data for road traffic noise based on the introduction of probabilistic neural networks, Noboru Nakasako, Mitsuo Ohta, Journal of the Acoustical Society of Japan (E) (English translation of Nippon Onkyo Gakkaishi), 17, 1, 27, 32, 1996 , 10.1250/ast.17.27Summary: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.
- An Extended Evaluation Method of Non-Gaussian Type Sound Environment Utilizing the Generalized Capability in the Parallel Information Processing of Neural Network and Fuzzy Probability, J. Acoust. Soc. Jpn., 51, 4, 299, 1995 , 10.20697/jasj.51.4_299
- STOCHASTIC SIGNAL-PROCESSING FOR INCOMPLETE OBSERVATIONS UNDER THE AMPLITUDE LIMITATIONS IN INDOOR AND OUTDOOR SOUND ENVIRONMENTS BASED ON REGRESSION-ANALYSIS, N NAKASAKO, M OHTA, H OGAWA, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E77A, 8, 1353, 1362, 1994 08 Summary: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.
- The Transformation Relationship of Dual Direction Type among Noise Evaluation Indices L
_{x}'s Based on an Improvement of the Principal Component Analysis Method, J. Acoust. Soc. Jpn., 50, 10, 829, 1994 , 10.20697/jasj.50.10_829 - A PRACTICAL TRIAL OF DYNAMICAL STATE ESTIMATION FOR NON-GAUSSIAN RANDOM VARIABLE WITH AMPLITUDE LIMITATION AND ITS APPLICATION TO THE REVERBERATION TIME MEASUREMENT, N NAKASAKO, M OHTA, Y MITANI, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E76A, 9, 1392, 1402, 1993 09 Summary: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

- 2007 06 , The China-Japan Joint Conference on Acoustics 2007, The Best Paper Award

- Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Development of rear sonar using exhaust sound of automobile, The 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.
- Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Theoretical analysis of sound reduction property in one-dimensional random duct and its application to noise control, It 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)), Identification of sound source position or direction based on the statistical independecy in an actual sound environment, Sound 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.
- Theory of Independent Component Analysis and Its Application to Actual Data
- Neural Networks, Fuzzy Theory and Genetic Algorithm and Their Application to Random Signal Processing
- Development of Signal Processing Algorithm and Its Application to Environmental System