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Voice activity detector for audio signals

  • US 10,418,052 B2
  • Filed: 10/12/2017
  • Issued: 09/17/2019
  • Est. Priority Date: 02/26/2007
  • Status: Active Grant
First Claim
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1. A method for determining voice activity in an audio signal, the method comprising:

  • receiving a frame of an input audio signal, the input audio signal having a sample rate;

    spitting the audio signal into a plurality of subbands by way of a sequence of filter banks, the plurality of subbands including at least a lowest subband and a highest subband;

    filtering the lowest subband with a linear filter to reduce an energy of the lowest subband;

    estimating a noise level for at least some of the plurality of subbands such that in each subband, a noise level estimator tracks the background noise level and a Signal-to-Noise Ratio (SNR) valuecalculating a signal to noise ratio value for at least some of the plurality of subbands; and

    determining a speech activity level based at least in part on an average of the calculated signal to noise ratio values and an average of an energy of at least some of the plurality of subbands,wherein the method is performed with one or more computing devices.

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