Hearing aid with acoustic feedback suppression

Details Hearing aid with acoustic feedback suppression Hearing aid with acoustic feedback suppression

2011-07-05

2011-07-05

Tsang, Fan (Department: 2614)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Noise compensation circuit

C381S071110

Reexamination Certificate

active

07974428

ABSTRACT:
A hearing aid having an input transducer (2), a signal processor (3), an output transducer (4) and an adaptive filter (5) for generating a feedback cancellation signal (101) further comprises a norm estimator (10) generating a first norm signal (109) indicative of a norm of the electrical input signal and a second norm signal (110) indicative of a norm of a feedback-cancelled electrical input signal, a comparator for comparing the first and second norm signals and generating a difference value Nfbc−Nxand a decision unit disabling application of the feedback cancellation signal to the signal path of the hearing aid if the difference value is above a certain threshold value cththus avoiding the feedback cancellation mechanism actually increasing acoustic feedback of the hearing aid. The invention also provides a method for reducing acoustic feedback of a hearing aid, a computer program, and an electronic circuit for a hearing aid.

REFERENCES:
patent: 5091952 (1992-02-01), Bustamante
patent: 5375145 (1994-12-01), Johnson
patent: 6480610 (2002-11-01), Fang
patent: 2003/0053647 (2003-03-01), Kates
patent: EP 1191813 (2000-09-01), None
patent: EP 1191814 (2002-03-01), None
patent: WO 2005/020632 (2005-03-01), None

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