OBJECTIVE MEASURES FOR REAL-TIME EVALUATION OF ADAPTIVE FEEDBACK CANCELLATION ALGORITHMS IN HEARING AIDS

This paper discusses objective measures for real-time evaluation of feedback cancellation algorithms in hearing aids in the presence of non-white input signals. Based on these measures, the maximum stable gain, the sound quality and the time required to recover from instability are determined for several real-time frequency-domain adaptive feedback cancellation algorithms, including adaptive feed-back cancellation with bandlimited adaptation and prediction-error method based adaptive feedback cancellation (PemAFC) with au-toregressive modelling of the desired signal. Of all the evaluated methods, the PemAFC with adaptive desired signal model achieves the best feedback suppression for a tonal music signal and the short-est time to recover from instability. 1