Adaptive filters cancel hearing aid whistling caused by earphone-microphone feedback

Evidence

Feedback cancellation helps to suppress the loud whistling caused by possible acoustic feedback from the hearing aid earphone to the hearing aid microphone. Feedback cancellation can be implemented, for example, with an adaptive filter that detects the feedback and adjusts the filter response adaptively to attenuate the feedback. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2753