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MULTIPLE MICROPHONE VOICE ACTIVITY DETECTOR

  • US 20090089053A1
  • Filed: 09/28/2007
  • Published: 04/02/2009
  • Est. Priority Date: 09/28/2007
  • Status: Active Grant
First Claim
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1. A method of detecting voice activity, the method comprising:

  • receiving a speech reference signal from a speech reference microphone;

    receiving a noise reference signal from a noise reference microphone distinct from the speech reference microphone;

    determining a speech characteristic value based at least in part on the speech reference signal;

    determining a combined characteristic value based at least in part on the speech reference signal and the noise reference signal;

    determining a voice activity metric based at least in part on the speech characteristic value and the combined characteristic value, wherein determining the speech characteristic value comprises determining an absolute value of the autocorrelation of the speech reference signal; and

    determining a voice activity state based on the voice activity metric.

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