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Speech recognition system using Markov models having independent label output sets

  • US 5,031,217 A
  • Filed: 09/21/1989
  • Issued: 07/09/1991
  • Est. Priority Date: 09/30/1988
  • Status: Expired due to Fees
First Claim
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1. A speech recognition system comprising:

  • a means for generating spectrum data from input speech in every predetermined time interval;

    a means for quantizing said spectrum data by using a predetermined spectrum prototype set for recognition, each spectrum prototype having an identifier, and for generating a recognition spectrum prototype identifier corresponding to each of said spectrum data;

    a means for generating spectrum variation data from said input speech in each said time interval;

    a means for quantizing said spectrum variation data by using a predetermined spectrum variation prototype set for recognition, each spectrum variation prototype having an identifier, and for generating a recognition spectrum variation prototype identifier corresponding to each of said spectrum variation data;

    a means for storing a plurality of probabilistic models corresponding to speech of said time interval, and identified by model identifiers relating to the spectrum data and model identifiers relating to the spectrum variation data, each of which models has one or more states, transitions from said states, probabilities of said transitions, output probabilities for outputting each of said recognition spectrum prototype identifiers at each of said states or said transitions, and output probabilities for outputting each of said recognition spectrum variation prototype identifiers at each of said states or said transitions;

    a means for estimating, for each of a plurality of words, each word represented by a series of probabilistic models from the storage means, a likelihood that a series of spectrum prototype identifiers and a series of spectrum variation prototype identifiers generated from an utterance of the word will be the same as the spectrum prototype identifiers and spectrum variation prototype identifiers generated from the input speech; and

    a means for outputting the word having the highest likelihood.

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