Abstract
Harry Levitt was an early advocate of digital signal processing for hearing aids. His interest included not only algorithms for compression and speech enhancement, but also more practical issues such as obtaining the desired hearing aid versus frequency response at the ear drum. Acoustic feedback is one problem that can limit the maximum gain possible in a hearing aid. Feedback cancellation, in which the acoustic feedback signal is estimated and subtracted from the microphone input, allows for greater hearing-aid signal amplification, and feedback cancellation was included in the work that Harry supported in his research group. In this presentation, the effects of feedback on the hearing-aid response will be reviewed. Digital adaptive filter techniques for feedback cancellation will then be presented, along with measurements indicating the limitations of feedback cancellation.
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