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Threshold adaptation in two-channel noise estimation and voice activity detection

  • US 9,524,735 B2
  • Filed: 01/31/2014
  • Issued: 12/20/2016
  • Est. Priority Date: 01/31/2014
  • Status: Active Grant
First Claim
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1. A method for adapting a threshold used in multi-channel audio noise estimation, comprising, wherein the separation is computed on a per frequency bin and on a per time frame basis as a sequence of discrete-time vectors, each vector having one or more frequency bins and corresponding to a respective time frame of digital audio:

  • computing strength of a primary sound pick up channel;

    computing strength of a secondary sound pick up channel;

    computing separation versus time, being a measure of difference between the strengths of the primary and secondary channels;

    analyzing a plurality of peaks in the separation versus time, wherein analyzing a plurality of peaks comprises computing a leaky peak capture function of the separation by updating a current value of the function to a new value in accordance with the separation being greater than a previous value of the function, wherein the leaky peak capture function captures a peak in the separation and then decays over time; and

    adjusting a threshold that is to be used in an audio noise estimation process in accordance with the leaky peak capture function of the separation, wherein the threshold is an audio signal strength value.

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