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Development of Feedback Active Noise Control Technology for Noise in Multiple Narrow Frequency Bands by Multiplexing of Single-frequency Adaptive Notch Filters

Article of Honda R&D Technical Review Vol.26 No.2

Summary

When vehicles are in motion, noise made up of noise in multiple narrow frequency bands, originating in input from the road surface, is generated in the cabin. This type of noise is termed low-frequency-band road noise, and it is desirable to reduce it in order to increase occupant comfort. The research discussed in this paper used feedback control technology as a base in the development of an active noise control technology able to simultaneously reduce noise in multiple narrow frequency bands. Methods of connecting multiple single-frequency adaptive notch filters, a type of adaptive filter, were studied. Based on the results, a method of connecting multiple filters that would mitigate mutual interference between controller transfer characteristics was proposed. This method made it possible to realize controllers with amplitude and phase characteristics in multiple narrow frequency bands corresponding to design values, and to obtain the target noise-reduction characteristic.

Reference

(1) Sano, H., Inoue, T., Takahashi, A., Ishihara, D., Yamashita, T., Terai, K.: Active Control System for Low Frequency Road Noise Combined with an Audio System, HONDA R&D Technical Review, Vol. 12, No. 2, p. 71-80
(2) Inoue, T., Sano, H., Takahashi, A., Yamashita, T., Ishihara, D., Nakamura, M., Terai, K., Nakamura, Y.: Development of active control system for low frequency road noise, JSAE Annual Congress Proceedings, No. 111-00, p. 13-16, (2000) (in Japanese)
(3) Sano, H., Inoue, T., Takahashi, A., Terai, K., Nakamura, Y.: Active control system for low-frequency road noise combined with an audio system, Speech and Audio Processing, IEEE Transactions on, Vol. 9, Issue 7, p. 755-763 (2001)
(4) Inoue, T., Takahashi, A., Minowa, S., Sano, H.: Development of Active Noise Control System for Engine Booming Noise, Honda R&D Technical Review, Vol. 15, No. 2, p. 201-208
(5) Inoue, T., Takahashi, A,. Minowa, S., Sano, H., Onishi, M., Nakamura, Y.: Development of Active Booming Noise Control System Applying Adaptive Notch Filter, JSAE Annual Congress Proceedings, No. 84-03, p. 1-4, (2003) (in Japanese)
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(7) Inoue, T.: Active Sound Control Technology in Automobiles, Journal of INCE/J, Vol. 34, No. 5, p. 336-341 (2010) (in Japanese)
(8) Inoue, T., Takahashi, A., Sakamoto, K., Kobayashi, Y.: Integrated Active Noise Control System for Low-frequency Noise in Automobiles, Honda R&D Technical Review, Vol. 23, No. 2, p. 121-128
(9) Widrow, B., Stearns, S. D.: Adaptive Signal Processing, Prentice Hall, Englewood Cliffs, New Jersey (1985)
(10) Adachi, S., Sano, H.: Modeling, control and experiment of a feedback active noise control system for free sound fields, JSME International Journal, Series C, 45-2, p. 409-416 (2002)
(11) Nishida, T., Sakamoto, K., Inoue, T., Adachi, S.: A comparative study of feedback active noise control for low frequency noise, The SICE Annual Conference (2013)

Author (organization or company)

Kosuke SAKAMOTO(Automobile R&D Center)、Toshio INOUE(Automobile R&D Center)

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