Method of and means for adaptively filtering screeching noise ca

Details Method of and means for adaptively filtering screeching noise ca Method of and means for adaptively filtering screeching noise ca

1985-10-17

1988-11-08

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 83, 381 93, H03B 2900

Patent

active

047838183

ABSTRACT:
A communication system, such as a hearing aid or a public address system, may include a microphone for inputting audio information to the system, an amplifier for amplifying audio frequency signals inputted to the microphone, and a speaker for outputting amplified audio frequency signals into the environment which provides an acoustic feedback path between the speaker and the microphone. The invention provides an identification circuit for dynamically identifying those parameters associated only with acoustic feedback, and a correction circuit whose transfer function is established in accordance with the parameters identified by the identification circuit. The transfer function of the correction circuit is such that the effect of acoustic feedback is cancelled from the transfer function of communication system. The identification circuit is constructed and arranged to identify said parameters in response to a turn-on of the system, or to an automatically-sensed threshold change in gain of the amplifier.

REFERENCES:
patent: 4025721 (1977-05-01), Graupe et al.
patent: 4088835 (1978-05-01), Thurmond et al.
patent: 4185168 (1980-01-01), Graupe et al.
patent: 4602337 (1986-07-01), Cox
patent: 4636586 (1987-01-01), Schiff
patent: 4689821 (1987-08-01), Salikuddin et al.

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