Adaptive active noise cancellation apparatus

Details Adaptive active noise cancellation apparatus Adaptive active noise cancellation apparatus

1991-06-28

1993-10-05

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10K 1116

Patent

active

052512622

ABSTRACT:
An adaptive type active noise cancellation apparatus comprises a first sensor for detecting a noise generated by a noise source and outputting a detection signal, a filter having a predetermined filter coefficient and filtering the output signal from the first sensor by using the predetermined filter coefficient and outputting a filtered signal, a speaker for receiving the filtered signal and generating a sound corresponding to the filtered signal, an active noise cancellation control system for actively canceling a noise at a control target point by using the sound generated by the speaker, a second sensor, arranged at the control target point, for detecting a sound at the control target point and outputting a detection signal, and an adaptive control system for receiving the output signals from the first and second sensors and adaptively updating the filter coefficient in accordance with a change in state of a system to which the active noise cancellation control system is applied. The adaptive control system includes a switch for stopping the active noise cancellation control system in adaptive processing, and a correction system for correcting the output signal from the first sensor or the second sensor by using a transfer function corresponding to a delay in a spatial system between the speaker and the second sensor and a delay required for calculation processing.

REFERENCES:
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Journal of Sound and Vibration; C. F. Ross; 1982, vol. 80(3), pp. 381-388.
Soviet Physics: Acoustics, vol. 36, No. 3, May/Jun. 1990, pp. 276-279, G. S. Lyubashevskii, et al., "Rate of Convergence of Adaptive Suppression of Broadband Oscillations in One-Dimensional Structures".
"An Adaptive Digital Filter For Broadband Active Sound Control".
Proceedings of the Acoustical Society of Japan (Autumn Conference); H. Hamada; Oct., 1986, pp. 367-368; "Research of Electronic Sound Cancellation System (6th Report)".

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