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Microphone array with high directivity

  • US 6,526,147 B1
  • Filed: 11/12/1998
  • Issued: 02/25/2003
  • Est. Priority Date: 11/12/1998
  • Status: Expired due to Fees
First Claim
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1. A microphone array comprising:

  • multiple individual microphones arranged in pairs and disposed in an elongated housing, the individual microphones in each pair are disposed on opposing sides of a centerline of the microphone array and the microphones on opposing sides of the centerline are positioned at different distances from the centerline;

    a summation link for summing signals from the microphones to form an output signal of the microphone array; and

    low pass filters operatively coupled between the microphones and the summation link, wherein associated microphone pairs are connected to low-pass filters having identical cut-off frequencies and the cut-off frequencies are different for each microphone pair, and further wherein cut-off frequencies of low-pass filters associated with microphone pairs disposed distant from the centerline are lower than cut-off frequencies of low pass filters associated with microphone pairs disposed proximate the centerline, wherein cut-off frequencies for low-pass filters associated with microphone pairs mutually correspond to distances between microphone pairs and the centerline of the microphone array.

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