An Effective Acoustic Feedback Cancellation Algorithm Based on the Normalized Sub-Band Adaptive Filter

Xia WANG  Ruiyu LIANG  Qingyun WANG  Li ZHAO  Cairong ZOU  

IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.1   pp.288-291
Publication Date: 2016/01/01
Publicized: 2015/10/20
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2015EDL8087
Type of Manuscript: LETTER
Category: Speech and Hearing
sub-band adaptive filters,  acoustic feedback cancellation,  hearing aids,  variable step size,  

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In this letter, an effective acoustic feedback cancellation algorithm is proposed based on the normalized sub-band adaptive filter (NSAF). To improve the confliction between fast convergence rate and low misalignment in the NSAF algorithm, a variable step size is designed to automatically vary according to the update state of the filter. The update state of the filter is adaptively detected via the normalized distance between the long term average and the short term average of the tap-weight vector. Simulation results demonstrate that the proposed algorithm has superior performance in terms of convergence rate and misalignment.