| 摘要 |
A hearing aid is provided having an input transducer, a signal processor, an output transducer and an adaptive filter for generating a feedback cancellation signal further comprises a norm estimator generating a first norm signal indicative of a norm of the electrical input signal and a second norm signal 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 N fbc - N x and 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 c th thus 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.
|
