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Echo cancellation in telephones with multiple microphones

  • US 20060147063A1
  • Filed: 09/30/2005
  • Published: 07/06/2006
  • Est. Priority Date: 12/22/2004
  • Status: Abandoned Application
First Claim
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1. A telephone that provides improved echo cancellation performance, comprising:

  • a receiver that receives a far-end audio signal comprising a voice component of a far-end user;

    a loudspeaker that converts the far-end audio signal into sound waves;

    a first microphone that picks up the sound waves and outputs a first audio signal, the first audio signal including a first voice component associated with the voice of a near-end user and a second voice component associated with the voice of the far-end user;

    a second microphone that outputs a second audio signal;

    a voice activity detector (VAD) that processes the first audio signal, the second audio signal and the far-end audio signal to generate output relating to at least one of (i) time intervals in which the first voice component is present in the first audio signal and (ii) time intervals in which the second voice component is present in the first audio signal; and

    an echo canceller that cancels the second voice component included in the first audio signal based on the output from the VAD, thereby producing a third audio signal.

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