This paper presents a decorrelation technique to improve the performance of acoustic feedback cancellation in hearing aids, particularly for the continuous adaptation approach. It is proposed that the input and the output signals of the hearing aids are decorrelated via the use of higher-order time-varying allpass filters in order to adequately decorrelate the signals with as little degradation of the quality of the output signal of the hearing aids as possible. Simulation results are presented based on real speech signals and supported by subjective listening tests.
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