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    Placement Design of Microphone Arrays in Near-Field Broadbank Beamformers

    Access Status
    Fulltext not available
    Authors
    Feng, Z.
    Yiu, Ka Fai
    Nordholm, Sven
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Feng, Z. and Yiu, K.F. and Nordholm, S. 2012. Placement Design of Microphone Arrays in Near-Field Broadbank Beamformers. IEEE Transactions on Signal Processing. 60 (3): pp. 1195-1204.
    Source Title
    IEEE Transactions on Signal Processing
    DOI
    10.1109/TSP.2011.2178491
    ISSN
    1053-587X
    URI
    http://hdl.handle.net/20.500.11937/39080
    Collection
    • Curtin Research Publications
    Abstract

    In beamformer design, the microphone array configuration is often prescribed and the filter coefficients are varied in order to improve on the noise reduction performance. However, the positions of the microphone elements play an important role in the overall performance and should be optimized at the same time. This problem is addressed in this paper. In order to understand the performance improvement through location movements, we first look at the design with an infinite filter length, which gives the performance limit for finite filter length designs. When the filter length is finite, both the filter coefficients and the placement of the microphone array are decision variables. In both situations, the problems can be formulated as constrained optimization problems. As the filter length increases, we show that the performance converges quickly to the limit. For illustration, two numerical examples are solved. Comparing with several popular configurations, we show that the performance of the optimized configuration improves significantly.

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