An Efficient Adaptive Feedback Cancellation for Hearing Aids

Sang Min LEE  In Young KIM  Young Cheol PARK  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.9   pp.2446-2450
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.9.2446
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Speech and Hearing
feedback cancellation,  decorrelation,  all-pass filter,  hearing aids,  

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Howling is very annoying problem to the hearing-aid users and it limits the maximum usable gain of hearing aids. We propose a new feedback cancellation system by inserting a time-varying decorrelation filter in the forward path. We use a second-order all-pass filter with control parameters whose time variation is implemented using a low-frequency modulator. A noticeable reduction of weight-vector misalignment is achievable using our proposed method.