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Apparatus and method for determining a likely word sequence from labels generated by an acoustic processor

  • US 4,748,670 A
  • Filed: 05/29/1985
  • Issued: 05/31/1988
  • Est. Priority Date: 05/29/1985
  • Status: Expired due to Fees
First Claim
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1. In a speech recognition system having an acoustic processor which generates a string of acoustic labels in response to speech input and a decoder which matches words in a vocabulary against generated labels in a string, a method of forming at least one likely sequence of words for a speech input, the method comprising the steps of:

  • (a) generating a string of labels in response to a speech input;

    (b) selecting words from a vocabulary as possible first words corresponding to labels at the beginning of the string;

    (c) for a subject selected word,(i) locating a most likely boundary label interval in the string whereat the subject selected words has the highest probability of ending; and

    (ii) evaluating a respective likelihood of the subject selected word at each label interval of the string up to and including the most likely boundary label interval;

    (d) repeating step (c) for each selected word as the subject selected word; and

    (e) classifying a given selected word as extendible if the likelihood at the particular label interval corresponding to the most likely boundary label interval thereof is within a predefined range of the highest likelihood for any selected word at said particular label interval.

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