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Microphone-array apparatus and method for extracting desired signal

  • US 4,536,887 A
  • Filed: 10/07/1983
  • Issued: 08/20/1985
  • Est. Priority Date: 10/18/1982
  • Status: Expired due to Term
First Claim
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1. A microphone-array apparatus comprising:

  • a plurality of microphone elements for receiving acoustic signals;

    first delay means connected to the microphone elements, for delaying their output signals for different periods of time to output a plurality of delayed signals;

    first weighted summation means connected to the first delay means, for weighting and summing up the plurality of delayed output signals to extract desired signals from the signals produced by the microphone elements while at the same time reducing unnecessary signals contained in the received acoustic signals;

    fictitious desired signal generating means for electrically generating a fictitious desired signal;

    first adding means for adding the fictitious desired signal from the fictitious desired signal generating means and the output signal of each of the microphone elements;

    second delay means connected to the first adding means, for delaying the added signals therefrom in the same manner as in the first delay means; and

    weighting value determining means connected to the second delay means and the fictitious desired signal generating means, for computing weighting values of the first weighted summation means in a manner to minimize a predetermined measure through using the plurality of delayed output signals from the second delay means and the fictitious desired signal.

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