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Ambient noise cancellation for voice communication device

  • US 9,601,102 B2
  • Filed: 04/19/2016
  • Issued: 03/21/2017
  • Est. Priority Date: 03/21/2002
  • Status: Expired due to Term
First Claim
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1. A method comprising:

  • detecting, by a first microphone, a first signal containing voice signals and ambient noise;

    detecting, by a second microphone, a second signal containing the ambient noise;

    receiving a noise cancellation signal indicating whether to cancel the ambient noise;

    providing both the first signal detected by the first microphone and the second signal detected by the second microphone to an ambient noise compensation signal generator;

    responsive to the noise cancellation signal indicating to cancel the ambient noise, enabling the ambient noise compensation signal generator to generate a compensation signal based on the first signal detected by the first microphone and the second signal detected by the second microphone, wherein a mixer mixes the first signal detected by the first microphone with the compensation signal such that the ambient noise contained in the first signal detected by the first microphone is attenuated;

    responsive to the noise cancellation signal indicating not to cancel the ambient noise, disabling the ambient noise compensation signal generator, wherein the mixer mixes the first signal detected by the first microphone with the second signal detected by the second microphone, such that the ambient noise contained in the first signal detected by the first microphone is not attenuated;

    buffering the first signal such that an arrival time of the first signal and the compensation signal at the mixer is synchronized; and

    providing an output of the mixer to a transmitter.

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