Apparatus and method for reducing acoustic feedback

Details Apparatus and method for reducing acoustic feedback Apparatus and method for reducing acoustic feedback

1993-09-13

1995-05-02

Isen, Forester W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Continuous rim mounting

351 682, 351 684, 351 93, H04R 2700

Patent

active

054127343

ABSTRACT:
The AM signal from a microphone is converted into an inaudible, FM signal which is combined with the AM signal to form a composite signal. The composite signal is amplified and converted into sound waves by a speaker. Any sound returning to the microphone from the speaker has an FM component and the FM component is demodulated to reconstruct the original AM sound. The reconstructed AM signal is subtracted from the signal from the microphone, thereby removing the echo and cancelling feedback.

REFERENCES:
patent: 2556889 (1951-06-01), Sterner
patent: 2835814 (1956-03-01), Dorf
patent: 3842204 (1974-10-01), Leslie
patent: 4859127 (1986-05-01), Loughlin
Chowning, John M., "The Synthesis of Complex Audio Spectra by Means of Frequency Modulation", Computer Music Journal, pp. 46-54, Apr., 1977.

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