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    Two microphone acoustic feedback cancellation in digital hearing aids: A step size controlled frequency domain approach

    Access Status
    Fulltext not available
    Authors
    Pradhan, S.
    George, N.
    Albu, F.
    Nordholm, Sven
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Pradhan, S. and George, N. and Albu, F. and Nordholm, S. 2018. Two microphone acoustic feedback cancellation in digital hearing aids: A step size controlled frequency domain approach. Applied Acoustics. 132: pp. 142-151.
    Source Title
    Applied Acoustics
    DOI
    10.1016/j.apacoust.2017.11.015
    ISSN
    0003-682X
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/62940
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier Ltd The feedback cancellation performance of behind the ear hearing aids can be improved by employing two microphones in the feedback cancellation process. A frequency domain implementation of feedback cancellation in a two microphone behind the ear hearing aid has been proposed in this paper. A frequency domain step size control scheme has been further introduced to improve the convergence behaviour. The implementation of a the frequency domain step size control method requires the microphone input signal as well as the loudspeaker output signal to be uncorrelated. In order to reduce the correlation effects and enable such an implementation, we have incorporated frequency shifting in the forward path. The proposed approach has been shown to provide improved convergence behaviour as well as offer enhanced speech quality. Further, the proposed scheme is expected to offer a reduced computational load for longer feedback paths.

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