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Method for word spotting in continuous speech

  • US 5,425,129 A
  • Filed: 10/29/1992
  • Issued: 06/13/1995
  • Est. Priority Date: 10/29/1992
  • Status: Expired due to Fees
First Claim
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1. In a speech recognition system, a subsystem for spotting pre-specified words, comprising:

  • a sub-word model analyzer using context independent phoneme models and having an input connected to a source of continuous speech;

    a full-word model analyzer using triphone based models which may coincide with the context independent phoneme models, the full-word model analyzer [and]having an input connected to said source of continuous speech;

    said sub-word model analyzer having a first threshold output signal indicative of the presence of one or more said phoneme models;

    said full-word model analyzer having a second threshold indicative of the probability of the presence of a pre-specified word, represented by a triphone based model; and

    a pre-specified word detecting means having an input coupled to said sub-word model analyzer, for receiving said first threshold output, and coupled to said full-word model analyzer, for receiving said second threshold, and in response thereto, identifying a pre-specified word to be spotted, provided the probability of the presence of the pre-specified word, represented as a triphone model is greater than the probability of the presence of the phoneme model.

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