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Noise reduction in multi-microphone systems

  • US 10,469,944 B2
  • Filed: 10/16/2014
  • Issued: 11/05/2019
  • Est. Priority Date: 10/21/2013
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving at least three microphone audio signals from at least three microphones, the at least three microphones located on or coupled to an apparatus;

    determining which of the at least three microphone audio signals is from a main microphone of the at least three microphones, where the main microphone comprises a first near microphone of the at least three microphones located near to a desired audio source;

    generating a beam audio signal based on a filtering of a first near microphone audio signal of the at least three microphone audio signals from the first near microphone and a second near microphone audio signal of the at least three microphone audio signals from a second near microphone of the at least three microphones;

    generating an anti-beam audio signal based on a different filtering of the first near microphone audio signal and the second near microphone audio signal;

    generating a first audio interference cancellation output signal based on the beam audio signal and the anti-beam audio signal;

    generating a second audio interference cancellation output signal based on the beam audio signal and a input third microphone audio signal of the at least three microphone audio signals from a far microphone of the at least three microphones located further from the desired audio source than the first near microphone and the second near microphone;

    comparing levels of the first audio interference cancellation output signal and the second audio interference cancellation output signal; and

    providing a highest output signal of the first audio interference cancellation output signal and the second audio interference cancellation output signal based on the comparing of the levels.

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