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    Evaluation of two-microphone acoustic feedback cancellation using uniform and non-uniform sub-bands in hearing AIDS

    Access Status
    Fulltext not available
    Authors
    Tran, Linh T.T.
    Dam, Hai Huyen Heidi
    Schepker, H.
    Doclo, S.
    Nordholm, Sven
    Date
    2016
    Collection
    • Curtin Research Publications
    Type
    Conference Paper
    Metadata
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    Abstract

    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.

    Citation
    Tran, L. and Dam, H.H.H. and Schepker, H. and Doclo, S. and Nordholm, S. 2016. Evaluation of two-microphone acoustic feedback cancellation using uniform and non-uniform sub-bands in hearing AIDS, Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), 16-19 Dec. 2015, pp. 308-313: IEEE.
    Source Title
    2015 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC)
    URI
    http://hdl.handle.net/20.500.11937/50764
    DOI
    10.1109/APSIPA.2015.7415527
    Department
    Department of Mathematics and Statistics

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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 ...
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