Amplifier with automatic inhibition of acoustic feedback

Details Amplifier with automatic inhibition of acoustic feedback Amplifier with automatic inhibition of acoustic feedback

1985-03-20

1988-05-24

Ng, Jin F.

Electrical audio signal processing systems and devices

Feedback suppression

381 83, 381121, H04M 120, H04R 302

Patent

active

047471441

ABSTRACT:
An amplifier for acoustic signals provided with means for suppressing undesired acoustic feedback signals in a rapid manner. The amplifier includes a high-pass filter which separates a part of the signal to be amplified to obtain a control signal for reducing the gain of the amplifier when an acoustic feedback signal is detected. The output of the high-pass filter is connected to a periodicity detector, e.g. a single peak detector, which discriminates between an acoustic feedback signal having a regular periodicity and a signal having an irregular character, such as noise or speech. The control signal is derived from the output of the periodicity detector.

REFERENCES:
patent: 3405237 (1968-10-01), David, Jr. et al.
patent: 3920931 (1975-11-01), Yanick, Jr.
patent: 4079199 (1978-03-01), Patronis, Jr.

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