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    Combining null-steering and adaptive filtering for acoustic feedback cancellation in a multi-microphone earpiece

    Access Status
    Fulltext not available
    Authors
    Schepker, H.
    Tran, Linh Thi Thuc
    Nordholm, Sven
    Doclo, Simon
    Date
    2017
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Schepker, H. and Tran, L.T.T. and Nordholm, S. and Doclo, S. 2017. Combining null-steering and adaptive filtering for acoustic feedback cancellation in a multi-microphone earpiece, 2017 25th European Signal Processing Conference (EUSIPCO 2017), pp. 231-235.
    Source Title
    25th European Signal Processing Conference (EUSIPCO 2017)
    Source Conference
    2017 25th European Signal Processing Conference (EUSIPCO 2017)
    DOI
    10.23919/EUSIPCO.2017.8081203
    ISBN
    978-1-5386-0751-0
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/67871
    Collection
    • Curtin Research Publications
    Abstract

    © 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 is typically biased due to the closedloop hearing aid system. In contrast to conventional behindthe-ear hearing aids, in this paper we consider an earpiece with multiple integrated microphones. For such an earpiece it has previously been proposed to use a fixed null-steering beamformer to reduce the acoustic feedback in the microphones. In this paper we propose to combine the fixed null-steering beamformer with an additional adaptive filter to cancel the residual feedback component in the beamformer output. We compare the combination of the fixed null-steering beamformer and different adaptive filtering algorithms including subband adaptive filtering and the prediction-error-method based fullband adaptive filtering with using either of the two approaches alone. Experimental results using measured acoustic feedback show the benefit of using the combined approach compared to using either of the two approaches to cancel the acoustic feedback.

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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 ...
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      Schepker, 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 ...
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      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 ...
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