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    Postfiltering Using Multichannel Spectral Estimation in Multispeaker Environments

    217594_11990_PUB-47427.pdf (5.718Mb)
    Access Status
    Open access
    Authors
    Dam, Hai
    Nordholm, Sven
    Dam, Hai Huyen Heidi
    Low, Siow Yong
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Dam, H. and Nordholm, S. and Dam, H.H.H. and Low, S.Y. 2008. Postfiltering Using Multichannel Spectral Estimation in Multispeaker Environments. Eurasip Journal on Advances in Signal Processing. 2008: Article ID 860360.
    Source Title
    Eurasip Journal on Advances in Signal Processing
    DOI
    10.1155/2008/860360
    ISSN
    1110-8657
    School
    Western Australian Telecommunications Research Institute (Research Institute)
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/3696
    Collection
    • Curtin Research Publications
    Abstract

    This paper investigates the problem of enhancing a single desired speech source from a mixture of signals in multispeaker environments. A beamformer structure is proposed which combines a fixed beamformer with postfiltering. In the first stage, the fixed multiobjective optimal beamformer is designed to spatially extract the desired source by suppressing all other undesired sources. In the second stage, a multichannel power spectral estimator is proposed and incorporated in the postfilter, thus enabling further suppression capability. The combined scheme exploits both spatial and spectral characteristics of the signals. Two new multichannel spectral estimation methods are proposed for the postfiltering using, respectively, inner product and joint diagonalization. Evaluations using recordings from a real-room environment show that the proposed beamformer offers a good interference suppression level whilst maintaining a low-distortion level of the desired source.

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