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Speech processing apparatus and method

  • US 20020049593A1
  • Filed: 07/03/2001
  • Published: 04/25/2002
  • Est. Priority Date: 07/12/2000
  • Status: Active Grant
First Claim
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1. A speech processing apparatus comprising:

  • a data store operable to store a plurality of word models;

    a receiver operable to receive an utterance; and

    a matching unit operable to determine which of a plurality of word models stored in said data store most closely matches an utterance received by said receiver, said matching unit being arranged to output a value indicative of the goodness of each match between a most closely matching word model and an utterance received by said receiver;

    characterized by further comprising;

    a confidence model store operable to associate each word model stored in said data store with data indicative of the probability of a said value indicative of the goodness of match being output if said word model correctly or incorrectly matches an utterance; and

    a confidence score output unit operable to determine and output a confidence score indicative of a calculated posterior probability that a received utterance has been correctly matched to a word model given that the match resulted in the output of a particular value indicative of goodness of match, said output unit being arranged to calculate said confidence score for a match utilizing said value output by said matching unit and said data associated with the word model matched to utterances by said confidence model store.

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