Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Akira Omoto Last modified date:2019.06.05

Professor / Sound Culture, Art Management / Department of Communication Design Science / Faculty of Design


Papers
1. Hiroshi Kashiwazak, Akira Omoto, Sound field reproduction system using narrow directivity microphones and boundary surface control principle, Acoustical Science and Technology, 10.1250/ast.36.1, 39, 4, 2018.07, Boundary surface control (BoSC) is a useful method of reproducing the sound field physically. However, it is challenging in the case of real-time operation. This is mainly due to the calculation cost of a lot of inverse filter convolutions to obtain reproduction signals. This paper proposes a method for reducing of number of inverse filters and implements it in 24-channel narrow directivity (shotgun) microphone array and 24-channel circularly arranged loudspeaker array. Moreover, it provides an experimental evaluation of the reproduction accuracy according to measurement of reproduced wavefront. The accuracy of the reproduced wavefront by the filters, whose number was reduced to less than 1/5 by proposed method, was comparable with the case of full number of filters. Finally, a system aiming at sound field reproduction in a wide frequency range was constructed by a hybrid method of reproducing with an inverse filter in the low range and directly outputting from the speaker in the direction corresponding to the microphone in the high frequency range. We confirmed that real-time processing is possible for this hybrid method by using a convolution plug-in of digital audio workstation software..
2. Akira Omoto, Shiro Ise, Yusuke Ikeda, Kanako Ueno, Seigo Enomoto, Maori Kobayashi, Sound field reproduction and sharing system based on the boundary surface control principle , Acoustical Science and Technology, 10.1250/ast.36.1, 36, 1, 1-11, 2015.01.
3. Akira Omoto, Comment on 'A theoretical framework for quantitatively characterizing sound field diffusion based on scattering and absorption coefficient of walls', Journal of the Acoustical Society of America, 10.1121/1.4768884, 133, 1, 9-12, 2013.01.
4. Yuki Matsumoto, Akira Omoto, Application of an Auditory Filter for the Evaluation of Sounds and Sound Fields, Building Acoustics, 10.1260/1351-010X.18.1-2.175, 18, 1-2, 175-188, ISRAでのポスター発表原稿が掲載されたもの, 2011.03.
5. Yuki Matsumoto, Akira Omoto, Sound Field Evaluation by Using Auditory Filter: Application of Dynamic Compressive Gammachirp Filter, Acoustical Science and Technology, 31, 5, 368-370, 2010.09.
6. Taeko Akama, Hisaharu Suzuki, Akira Omoto, Distribution of selected monaural acoustical parameters in concert halls, Applied Acoustics, 10.1016/j.apacoust.2010.01.004, 71, 6, 564-577, Vol. 28, pp.84-89, 2010.06.
7. Yasuhiko Nagatomo, Namiko Hiramatsu, Genta Yamauchi, Akira Omoto, Variable reflection acoustic wall system by active sound radiation, Acoustical Science and Technology, Vol. 28, pp.84-89, 2007.03.
8. Hisaharu Suzuki, Akira Omoto, Kyoji Fujiwara, Treatment of boundary condition by finite difference time domain method, Acoustical Science and Technology, Vol. 28, pp.16-26, 2007.01.
9. Yoshinari Fukushima, Hisaharu Suzuki, Akira Omoto, Visualization of reflected sound in enclosed space by sound intensity measurement, Acoustical Science and Technology, Vol. 27, pp.187-189, 2006.05.
10. Yoko Takenouchi, Hisaharu Suzuki, Akira Omoto, Behavior of the practically implemented filtered reference LMS algorithm in an active noise control system, Acoustical Science and Technology, Vol. 27, pp.20-27, 2006.01.
11. Atsuro Ikeda, Masataka Nakahara, Chizuru Kai, Akira Omoto, The acoustical effect of audio equipment and furniture in a mixing room, Acoustical Science and Technology, Vol. 26, pp.233-236, 2005.03.
12. Masataka Nakahara, Akira Omoto, Kyoji Fujiwara, The effect of a mixing console on the monitoring response in a mixing room, Acoustical Science and Technology, Vol. 26, pp.90-101, 2005.03.
13. Akira Omoto, Harunori Uchida, Evaluation method of artificial acoustical environment: Visualization of sound intensity, Journal of Physiological Anthropology and Applied Human Science, Vol. 23, pp.249-253, 2004.12.
14. Yoko Takenouchi, Hisaharu Suzuki, Akira Omoto, Behavior of the adaptive algorithm for non-stationary noise signal: Difference between theoretical formulation and the practical implementation, Acoustical Science and Technology, Vol. 25, No. 6, pp.489-492, 2004.11.
15. Akira Omoto, Active Noise Control: Adaptive Signal Processing and Algorithm, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E85-A, No. 3
pp. 548-557, 2002.03.
16. Akira Omoto, Daisuke Morie, Kyoji Fujiwara, Behavior of adaptive algorithms in active noise control systems with moving noise sources, Acoustical Science and Technology, Vol. 23, No. 2
pp. 84-89, 2002.03.
17. Gensei Matsumoto, Kyoji Fujiwara, Akira Omoto, A study on the insertion loss of a noise barrier for a directional sound source, The Journal of the Acoustical Society of Japan (E), Vol. 20, No. 4, pp. 325-328, 1999.07.
18. Akira Omoto, S. J. Elliott, The Effect of Structured Uncertainty in the Acoustic Plant on Multichannel Feedforward Control Sysrtems, IEEE Transaction on Speech and Audio Processing, Vol. 7, No. 2, pp. 204-212, 1999.03.
19. Akira Omoto, Tohru Matsui, Kyoji Fujiwara, The behaviour of an adaptive algorithm with a moving primary source, The Journal of the Acoustical Society of Japan (E), Vol. 19, No. 3, pp. 211-221, 1998.05.
20. Akira Omoto, Kazuhiro Takashima, Kyoji Fujiwara, Masao Aoki, Yasuo Shimizu, Active suppression of sound diffracted by a barrier: an outdoor experiment, Journal of the Acoustical Society of America, Vol. 102, No. 3, pp. 1671-1679, 1997.09.
21. 尾本 章,S. J. Elliott, The Effect of Structured Uncertainty in Multichannel Feedforward Control Sysrtems, 1996 IEEE International Conference on Acoustics, Speech & Signal Processing, Volume 2, pp. 965-968, 1996.05.
22. Akira Omoto, Kyoji Fujiwara, A study of an actively controlled noise barrier, Journal of the Acoustical Society of America, Vol. 94, No. 4 pp. 2173-2180, 1993.10.