Digital feed-forward active noise control system

Details Digital feed-forward active noise control system Digital feed-forward active noise control system

1996-07-01

1998-12-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

381 715, 381 716, 381 7111, A61F 1106

Patent

active

058526676

ABSTRACT:
A method of noise control of an acoustic signal comprising: obtaining a reference signal of the acoustic signal to be controlled, applying an antinoise signal to the acoustic signal so as to control the acoustic signal, obtaining an error signal resulting from the application of the antinoise signal to the acoustic signal, generating the antinoise signal from the reference signal by passing the reference signal through a first filter having controllable filter coefficients, using a simplified model of a signal path from a location of the antinoise signal to a location of the error signal to obtain a modified representation of the reference signal, controlling the first filter coefficients by processing the error signal and the modified representation of the reference signal and generating a coefficient control signal such as to generate the antinoise signal, and applying the coefficient control signal to the first filter.

REFERENCES:
patent: 5018202 (1991-05-01), Takahashi et al.
patent: 5156153 (1992-10-01), Bonnefous
patent: 5267320 (1993-11-01), Fukumizu
patent: 5311453 (1994-05-01), Denenberg et al.
patent: 5410605 (1995-04-01), Sawada et al.
patent: 5548543 (1996-08-01), Wang

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