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Method and apparatus for voice-interactive language instruction

  • US 5,634,086 A
  • Filed: 09/18/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 03/12/1993
  • Status: Expired due to Term
First Claim
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1. A language instruction and evaluation method using an automatic speech recognizer which generates word sequence hypotheses and phone sequence hypotheses from input speech and a grammar model, wherein the input speech is speech spoken by the speaker in response to a prompting of the speaker to recite a preselected script, the method comprising the steps of:

  • generating a grammar model from the preselected script;

    imbedding alt elements in the grammar model between words and sentences of the preselected script thereby forming an altered grammar model, the alt elements representing potential nonscripted speech and pauses;

    generating an input hypothesis from the input speech using the automatic speech recognizer with the altered grammar model, wherein the input hypothesis comprises a subset of sequences of words and alts allowed by the altered grammar model;

    parsing the input hypothesis into sequences identified as one of words found in the preselected script, nonscripted speech and silence, wherein alts in the input hypotheses are associated with the nonscripted speech and the silence;

    evaluating the accuracy of the input speech based on a distribution of alts in the input hypothesis, the accuracy being a measure of how well the input speech corresponds with preselected script which the Speaker of the input speech was prompted to recite; and

    outputting an indication of the accuracy of the input speech to the speaker, thereby informing the speaker of how well the speaker has recited the preselected script.

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