EM interference canceller in an audio amplifier

Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit

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Details

455296, 455223, 455222, 455310, 381317, 381315, 381 712, 381 93, H04R 2500

Patent

active

061378887

ABSTRACT:
A problem in hearing aids or other audio/acoustic amplifier circuits is that external sources of EM energy may be coupled into the electronics of the hearing aid so as to contribute to the acoustic output. The invention provides a circuit for removing the effects of EM interference. A separate reference generator is used to detect the external EM energy. This is fed into an interference canceller which may be adaptive, which effectively removes the unwanted component in the hearing aid signal, leaving only a signal representative of the desired acoustic output.

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Tieben Inc. Brochure, U.S.A., Publication date unknown.
Peacock Inc. Brochure, Canada, Publication date unknown.

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