Closed-loop feedback cancellation utilizing two microphones and transform domain processing
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In this paper we are studying the use of two microphones for acoustic feedback cancellation in hearing aids. With the two microphones approach, an additional microphone is employed toprovide added information bout the signals which is then utilized to obtain an incoming signal estimate. This estimate is removed from the error signal prior to adapting the canceler, thus removing the undesired signal correlation. In this paper, we propose to use orthogonal transforms with the two microphones approach. The discrete Fourier transform and the discrete cosine transform are implemented to transform the adaptive filter signals. Also, a bank of adaptive filters is employed, each adapting to different portions of the spectrum for a finer control of the adaptation process. Simulation results based on real measured feedback paths and speech signals show improved convergence rates and stablesolutions.
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Nakagawa, C.; Nordholm, S.; Yan, Wei-Yong (2015)Acoustic feedback cancellation in hearing aids makes use of adaptive filters to continuously identify and track variations to the feedback path. One of the biggest problems remaining in using adaptive filters for feedback ...
Evaluation of two-microphone acoustic feedback cancellation using uniform and non-uniform sub-bands in hearing AIDSTran, Linh T.T.; Dam, Hai Huyen Heidi; Schepker, H.; Doclo, S.; Nordholm, Sven (2016)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 ...
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 ...