Noise suppressor

Details Noise suppressor Noise suppressor

1991-06-07

1992-07-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 13, 381 731, 381 93, 381 94, H04R 500, H04R 302, A61F 220, H04B 1500

Patent

active

051310473

ABSTRACT:
A noise suppressor is disclosed in which a noise signal is detected by a first detector, then processed by an adaptive filter, and an output signal from the adaptive filter and an audio signal from audio equipment are added by an adder and reproduced by a speaker. The sound signal thus reproduced by the speaker and the noise signal are detected by a second detector located at a listening point and sent to a filter control circuit. The filter control circuit possesses the signal sent from the second detector and the audio signal from the audio equipment having a transfer function from the adder to the filter control circuit convoluted thereby to remove the audio signal component therefrom. The adaptive filter adaptively controls the noise signal in response to the output signal from the filter control circuit.

REFERENCES:
patent: 4683590 (1987-07-01), Miyoshi et al.
patent: 4736431 (1988-04-01), Allie et al.
patent: 4987598 (1991-01-01), Eriksson
patent: 5018202 (1991-05-01), Takahashi et al.

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