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Low-complexity voice activity detection

  • US 10,360,926 B2
  • Filed: 07/07/2015
  • Issued: 07/23/2019
  • Est. Priority Date: 07/10/2014
  • Status: Active Grant
First Claim
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1. A low-complexity and low-power voice activity detector comprising:

  • a first channel for processing a first audio stream and detecting activity in a first frequency band, wherein the first frequency band includes a first group of formant frequencies characteristic of vowels;

    a second channel for processing the first audio stream and detecting activity in a second frequency band, wherein the second frequency band includes a second group of formant frequencies characteristic of vowels;

    a third channel for processing the first audio stream, detecting activity in a third frequency band, and reducing false positives, wherein the third frequency band is substantially out-of-band with the first frequency band; and

    a first decision module to detect that voice activity is present in the first audio stream if (1) the first channel and the second channel both detect activity, and (2) the third channel does not detect activity, and to detect that voice activity is not present if the third channel detects activity;

    wherein the detection that voice activity is present triggers one or more processes to be executed by a system.

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