New Insights into Optimal Acoustic Feedback Cancellation
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In this letter, we present new insights into the bias problem for acoustic feedback cancellation when a probe signal approach is used. The optimum solution of the feedback canceler is not the feedback path but the product of the feedback path and the sensitivity function and hence, the solution is biased. The novelty of this paper also consists of the derivation of the conditions for unbiased feedback cancellation when a probe signal is used as input to the canceler. An adequate delay in the forward path is necessary to reduce, or remove the bias term. The theoretical analysis is verified with simulation results.
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Schepker, H.; Tran, Linh T.T.; Nordholm, Sven; Doclo, S. (2016)In order to reduce acoustic feedback in hearing aids, adaptive filters are commonly used to estimate the feedback contribution in the microphone(s). While theoretically allowing for perfect feedback cancellation, in ...
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 ...
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 ...