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Noise cancelling microphone apparatus

  • US 9,810,925 B2
  • Filed: 02/14/2014
  • Issued: 11/07/2017
  • Est. Priority Date: 03/13/2013
  • Status: Active Grant
First Claim
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1. A method of reducing noise, comprising the steps of:

  • a) forming a main signal and one or more reference signals at a beam-forming module based on at least two received audio signals from at least two microphone elements;

    b) detecting voice activity at a voice activity detection module, the voice activity detection module receiving the main and reference signals and outputting a desired voice activity signal;

    c) adaptively cancelling noise at an adaptive noise cancellation module, the adaptive noise cancellation module receiving the main, reference, and desired voice activity signals and outputting an adaptive noise cancelled signal; and

    d) reducing noise at a single channel noise reduction module receiving the desired voice activity and adaptive noise cancelled signals and outputting a desired speech signal, wherein the beam-forming module, the adaptive noise cancellation module, and the single channel noise reduction module all employ only linear processing.

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