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Rejection method for speech recognition

  • US 5,097,509 A
  • Filed: 03/28/1990
  • Issued: 03/17/1992
  • Est. Priority Date: 03/28/1990
  • Status: Expired due to Term
First Claim
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1. A method for speech recognition comprising the steps of:

  • representing an unknown utterance as a first sequence of parameter frames, each parameter frame including a set of primary and secondary parameters and an equalized second sequence of parameter frames derived from the first sequence of parameter frames;

    comparing each of the primary and secondary parameters in the sequence of parameter frames of the representation of the unknown utterance to each of a plurality of reference representations expressed in the same kind of parameters, to determine how closely each reference representation resembles the representation of the unknown utterance;

    ranking the reference representations in order from best to worst choice in dependence upon their relative closeness to the representation of the unknown utterance, for each of the first and second sequences of parameters;

    computing a probability that the best choice is a correct match for the unknown utterance; and

    rejecting the best choice as a match for the unknown utterance if the probability is below a predetermined value.

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