Bias of feedback cancellation algorithms based on direct closed loop identification

Authors:
J. Hellgren;U. Forssell
Affiliations:
Dept. of Neurosci. & Locomotion, Linkoping Univ., Sweden;-
Venue:
ICASSP '00 Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 02
Year:
2000

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Band-limited feedback cancellation with a modified filtered-X LMS algorithm for hearing aids

Speech Communication - Special issue on speech processing for hearing aids

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Abstract

An adaptive filter can be used to cancel the undesired acoustic feedback of hearing aids. The adaptive algorithm studied in this paper uses the output and input signal of the hearing aid to continuously track the acoustic feedback path. The bias of the optimal estimate with a quadratic norm is analyzed. The results show the importance of having a good model of the input signal to the hearing aid, as the error in this model will introduce bias in the estimate of the feedback path.