Electronic filters, hearing aids and methods

Details Electronic filters, hearing aids and methods Electronic filters, hearing aids and methods

1993-05-10

1995-12-12

Chan, Wing F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381684, 381 68, H04R 2500

Patent

active

054757592

ABSTRACT:
An electronic filter for an electroacoustic system. The system has a microphone for generating an electrical output from external sounds and an electrically driven transducer for emitting sound. Some of the sound emitted by the transducer returns to the microphone means to add a feedback contribution to its electrical output. The electronic filter includes a first circuit for electronic processing of the electrical output of the microphone to produce a first signal. An adaptive filter, interconnected with the first circuit, performs electronic processing of the first signal to produce an adaptive output to the first circuit to substantially offset the feedback contribution in the electrical output of the microphone, and the adaptive filter includes means for adapting only in response to polarities of signals supplied to and from the first circuit. Other electronic filters for hearing aids, public address systems and other electroacoustic systems, as well as such systems and methods of operating them are also disclosed.

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