Voice activity detector (VAD) -based multiple-microphone acoustic noise suppression

  • US 8,019,091 B2
  • Filed: 09/18/2003
  • Issued: 09/13/2011
  • Est. Priority Date: 07/19/2000
  • Status: Active Grant
First Claim
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1. A method for removing noise from acoustic signals, comprising:

  • receiving at least two acoustic signals using at least two acoustic microphones positioned in a plurality of locations;

    receiving a voice activity signal that includes information on vibration of human tissue associated with human voicing activity of a user;

    generating a voice activity detection (VAD) signal using the voice activity signal;

    generating at least two transfer functions representative of a ratio of energy of the acoustic signal received using at least two different acoustic microphones of the at least two acoustic microphones when the VAD indicates that user voicing activity is absent, wherein the at least two transfer functions comprise a first transfer function and a second transfer function; and

    removing acoustic noise from at least one of the acoustic signals by applying the first transfer function and at least one combination of the first transfer function and the second transfer function to the acoustic signals and generating denoised acoustic signals.

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