Abstract

Acoustic feedback cancellation (AFC) is necessary to alleviate the annoying acoustic feedback problem in hearing aid devices. Moreover, the dynamic range of the amplifying gain of the hearing aids can be enhanced, after the acoustic feedback elimination. This paper aims to improve the performance of the AFC system in hearing aids, particularly for the continuous adaptation approach of the adaptive filter. The use of higher-order time-varying allpass filter with the AFC system is proposed to decorrelate the input and the output signals of the hearing aids for improved performance. In addition, a Forward Linear Predictor (FLP) is suggested in this paper to be employed for the prediction of speech input signal of the hearing aids so that the adaptive filter converges more accurately. Computer simulation based on real speech signals demonstrates the effectiveness of the proposed technique.