Evaluation of two-microphone acoustic feedback cancellation using uniform and non-uniform sub-bands in hearing AIDS
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The limiting feature of hearing aids is acoustic feedback. This feedback problem has been approached by using an acoustic feedback canceller. This well known identification in a loop problem, will give a biased solution due to correlation between the desired and loudspeaker signals. Speech and music signals have long tails in the correlation. As a result, the performance of the system is considerably degraded and under certain conditions the cancellation system will be unstable. The two-microphone techniques have the potential to significantly reduce this problem. This paper introduces the applications of uniform and non-uniform sub-band techniques into the two-microphone acoustic feedback cancellation (AFC-2mics) to decorrelate input signals and individually adapt solutions in those bands. The system has been evaluated in terms of Misalignment (MisAL) and Maximum Stable Gain (MSG) using both male and female speech input signals. The simulation results show that our proposed methods provide better performance than the other existing methods. © 2015 Asia-Pacific Signal and Information Processing Association.
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Combining null-steering and adaptive filtering for acoustic feedback cancellation in a multi-microphone earpieceSchepker, H.; Tran, Linh Thi Thuc; Nordholm, Sven; Doclo, Simon (2017)© EURASIP 2017. Commonly adaptive filters are used to reduce the acoustic feedback in hearing aids. While theoretically allowing for perfect cancellation of the feedback signal, in practice the adaptive filter solution ...
Null-steering beamformer for acoustic feedback cancellation in a multi-microphone earpiece optimizing the maximum stable gainSchepker, H.; Tran, L.; Nordholm, Sven; Doclo, S. (2017)© 2017 IEEE. Commonly adaptive filters are used to reduce the acoustic feedback in hearing aids. While theoretically allowing for perfect cancellation of the feedback signal, in practice the adaptive filter solution is ...
Schepker, H.; Tran, Linh T.T.; Nordholm, Sven; Doclo, S. (2016)In adaptive feedback cancellation an adaptive filter is used to model the acoustic feedback path between the hearing aid loudspeaker and the microphone. An important parameter for adaptive filters is the step-size, providing ...