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Speech recognition system utilizing both a long-term strategic and a short-term strategic scoring operation in a transition network thereof

  • US 5,133,012 A
  • Filed: 11/30/1989
  • Issued: 07/21/1992
  • Est. Priority Date: 12/02/1988
  • Status: Expired due to Fees
First Claim
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1. A speech recognition system comprising:

  • means for acoustically analyzing an input speech signal for obtaining feature parameters of the input speech signal;

    means for extracting a plurality of candidate phonetic segments from the feature parameters of the input speech signal, the candidate phonetic segments including acoustic feature labels of a silence, buzz, unvoiced sound and power dips;

    means for causing the candidate phonetic segments to be passed through transition networks constructed for respective words to be recognized to effect a word verification operation to obtain candidate words;

    means for determining a work score Q(k) of the candidate word by using a following equation including a first score represented by a first term and a second score represented by a second term of the following equation;

    ##EQU7## where μ

    denotes a weighing coefficient (0≦

    μ



    1), Sl denotes a similarity of a phonetic segment in a frame, L denotes a number of phonetic segments, S1l is a similarity of a first-order phonetic segment in a frame in which the phonetic segment takes a maximum value, and Smaxl denotes a maximum similarity of a corresponding phonetic segment;

    mean for selecting that candidate word having the largest candidate score Q(k) to be a result of speech recognition; and

    outputting the selected candidate word as said result of speech recognition.

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