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Method and apparatus for automation of directory assistance using speech recognition

  • US 5,479,488 A
  • Filed: 02/08/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 03/15/1993
  • Status: Expired due to Term
First Claim
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1. Directory assistance apparatus for a telephone system comprising:

  • a voice processing unit having at least one lexicon of lexemes potentially recognizable by the unit and data predetermined for each of said lexemes, means for issuing messages to a caller making a directory assistance call to prompt the caller to utter one of said lexemes;

    means for detecting an identifier for the call source from whence a directory assistance call was received;

    means responsive to the identifier detected, and to said data, for computing a probability index for each lexeme representing the likelihood of that particular one of said lexemes being that uttered by the caller; and

    speech recognition means for recognizing, on the basis of the acoustics of the caller'"'"'s utterance and the probability indexes, a lexeme corresponding to that uttered by the caller.

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