Sharp directive beamforming using microphone array and planar reflector

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  • Niwa Kenta
    NTT Media Intelligence Laboratories, NTT Corporation
  • Hioka Yusuke
    Department of Electrical and Computer Engineering, University of Canterbury
  • Sakauchi Sumitaka
    NTT Media Intelligence Laboratories, NTT Corporation
  • Furuya Ken'ichi
    Department of Computer Science and Intelligent Systems Faculty of Engineering, Oita University
  • Haneda Yoichi
    Graduate School of Informatics and Engineering, The University of Electro-Communications

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A method for sharp directive beamforming using a reflector is proposed. The method involves physically varying the transfer functions and the spatial correlation matrix by placing a planar reflector near a linear microphone array. We confirmed through experiments that the proposed method was effective for increasing the spatial nulls and minimizing the power of interference in the beamforming output and consequently achieving sharp directivity.

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