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Reducing noise in audio systems

  • US 7,171,008 B2
  • Filed: 07/12/2002
  • Issued: 01/30/2007
  • Est. Priority Date: 02/05/2002
  • Status: Active Grant
First Claim
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1. A method for processing audio signals generated by two or more microphones receiving acoustic signals, comprising the steps of:

  • (a) generating a ratio of sum and difference signal powers for the audio signals; and

    (b) filtering at least one of the audio signals based on the ratio to reduce a portion of the audio signals resulting from one or more of (i) incoherence between the audio signals and (ii) one or more audio-signal sources having propagation speeds different from the acoustic signals.

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