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Speech recognition apparatus which predicts word classes from context and words from word classes

  • US 5,267,345 A
  • Filed: 02/10/1992
  • Issued: 11/30/1993
  • Est. Priority Date: 02/10/1992
  • Status: Expired due to Fees
First Claim
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1. A language generator comprising:

  • means for generating two or more word-series hypothesis signals, each word-series hypothesis signal representing a word-series hypothesis comprising a series of linguistic units, each linguistic unit comprising one or more words selected from a language;

    means for generating a single-unit hypothesis score signal for each linguistic unit in each word-series hypothesis, each single-unit hypothesis score signal representing a single-unit hypothesis score comprising an estimate of the probability of occurrence of the individual linguistic unit in the word-series hypothesis;

    means for generating a word-series hypothesis score signal for each word-series hypothesis, each word-series hypothesis score signal comprising a combination of the single-unit hypothesis scores for the linguistic units in the word-series hypothesis;

    means for storing one or more word-series hypothesis signals representing candidate word-series hypotheses having the best word-series hypothesis scores; and

    means for outputting at least one word signal representing at least one word in at least one best candidate word-series hypothesis;

    characterized in that the means for generating a single-unit hypothesis score signal for a first individual linguistic unit comprises;

    means for estimating the conditional probability of occurrence of a first class of linguistic units comprising the first individual linguistic unit, given the occurrence of a context comprising the linguistic units in the word-series hypothesis other than the first individual linguistic unit;

    means for estimating the conditional probability of occurrence of the first individual linguistic unit given the occurrence of the first class of linguistic units, and given the occurrence of the context; and

    means for generating a single-unit hypothesis score signal for the first individual linguistic unit comprising a first component score comprising a combination of the estimated conditional probability of occurrence of the first class of linguistic units given the occurrence of the context, and the estimated conditional probability of occurrence of the first individual linguistic unit given the occurrence of the first class and given the occurrence of the context.

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