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Methods and apparatus for flexible speech recognition

  • US 7,698,136 B1
  • Filed: 01/28/2003
  • Issued: 04/13/2010
  • Est. Priority Date: 01/28/2003
  • Status: Active Grant
First Claim
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1. A computer implemented method, comprising:

  • receiving a speech signal;

    extracting a sequence of acoustic feature vectors from the speech signal;

    identifying a set of one or more words from the speech signal;

    identifying a set of one or more phrases from the speech signal, the set of one or more phrases including a sequence of words, wherein the set of one or more phrases comprises key phrases and filler phrases;

    assigning a first probability to a phrase of the one or more phrases, the first probability representing a likelihood that the sequence of acoustic feature vectors was produced by the phrase;

    assigning a second probability to the phrase of the one or more phrases, the second probability representing a likelihood that the phrase would be received;

    assigning a score to the phrase of the one or more phrases, the score calculated using the first probability and the second probability;

    andevaluating the speech signal against the set of phrases using the score.

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