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Speaker identification with user-selected password phrases

  • US 5,913,192 A
  • Filed: 08/22/1997
  • Issued: 06/15/1999
  • Est. Priority Date: 08/22/1997
  • Status: Expired due to Term
First Claim
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1. A speaker identification system, comprising:

  • a lexicon database storing for each of a group of enrolled users a set of one or more phonetic transcriptions of a password utterance associated with the enrolled user;

    an HNM database storing for each of the group of enrolled users a hidden Markov model corresponding to said password utterance;

    a speaker-independent phrase recognizer, which (i) selects N best matching password utterances based on an unknown utterance, and (ii) determines a speaker-independent score for each of the N best matching password utterances;

    a speaker-dependent phrase recognizer, which determines a speaker-dependent score for each of the N best matching password utterances; and

    a score processor, which (i) for each of the N best matching password utterances, sums the speaker-independent score and the speaker-dependent score to generate a combined score, and (ii) determines a putative identity based on the highest combined score.

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