Feedback Control in Hearing Aids

Acoustic feedback limits the maximum amplification that can be used in a hearing aid without making it unstable. This chapter gives an overview of existing techniques for feedback suppression and, in particular, adaptive feedback cancellation. Because of the presence of a closed signal loop, standard adaptive filtering techniques for open-loop systems fail to provide a reliable feedback path estimate if the desired signal is spectrally colored. Several approaches for improving the estimation accuracy of the adaptive feedback canceller will be reviewed and evaluated for acoustic feedback paths measured in a commercial behind-the-ear hearing aid.

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