Band-limited adaptive feedback canceller for hearing aids

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

Reexamination Certificate

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C381S083000, C381S093000, C381S320000

Reexamination Certificate

active

11089399

ABSTRACT:
An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all unstable frequencies. By limiting the bandwidth of the feedback cancellation signal, the distortion due to the adaptive filter is minimized and limited only to the unstable feedback regions. A relatively simple signal processing algorithm is used to produce highly effective results with minimal signal distortion.

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