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Voice search device, voice search method, and non-transitory recording medium

  • US 9,437,187 B2
  • Filed: 01/23/2015
  • Issued: 09/06/2016
  • Est. Priority Date: 03/05/2014
  • Status: Active Grant
First Claim
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1. A voice search device comprising:

  • a processor; and

    a memory storing instructions that, when executed by the processor, control the processor to;

    convert a search string into a phoneme sequence;

    acquire durations of respective phonemes included in the phoneme sequence;

    derive a spoken time length of voice corresponding to the search string based on the durations;

    designate a plurality of designated zones having time lengths in a target voice signal;

    acquire, using an acoustic model that does not depend on adjacent phonemes, a first group of likelihoods indicating how likely each zone from among the plurality of designated zones is a zone in which voice corresponding to the search string is spoken;

    specify, based on the first group of likelihoods, a plurality of estimated zones from among the plurality of designated zones, wherein each estimated zone is a zone in which the voice corresponding to the search string is estimated to be spoken, and wherein a number of the estimated zones is less than a number of the plurality of designated zones; and

    acquire, using an acoustic model that depends on adjacent phonemes, a second group of likelihoods indicating how likely each of the plurality of estimated zones is a zone in which the voice corresponding to the search string is spoken.

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