Band-limited feedback cancellation with a modified filtered-X LMS algorithm for hearing aids
Speech Communication - Special issue on speech processing for hearing aids
New analysis of adaptive filter algorithms in feedback systems
CSN '07 Proceedings of the Sixth IASTED International Conference on Communication Systems and Networks
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This paper studies analytically the steady-state convergence behavior of adaptive algorithms that approximate the Wiener solution when operating in continuous adaptation to reduce acoustic feedback in hearing aids. A bias is found in the adaptive filter's estimate of the hearing-aid feedback path when the input signal is not white. Delays in the forward and cancellation paths are shown to reduce the magnitude of the bias. Equations for the bias transfer function are obtained. A discussion about properties of the bias when delays are placed in the forward and cancellation paths follows.