An Efficient Feedback Canceler for Hearing Aids Based on Approximated Affine Projection
In the feedback cancelation systems in hearing aids, signal cancelation and coloration artifacts can occur for a narrow-band input. In this paper, we propose a new adaptive feedback cancelation algorithm that can achieve fast convergence by approximating the affine projection (AP) algorithm and prevent signal cancelation by controlling the step-size. A Gram-Schmidt prediction error filter (GS-PEF) is used for a stable approximation of the AP algorithm, and the step-size is varied using the prediction factor of the input signal. Simulations results are presented to verify efficiency of the proposed algorithm.
KeywordsFeedback Path Prediction Factor Acoustic Feedback Acoustic Echo Canceller NLMS Algorithm
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