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Speech recognition with preliminary matching

  • US 4,618,983 A
  • Filed: 12/22/1982
  • Issued: 10/21/1986
  • Est. Priority Date: 12/25/1981
  • Status: Expired due to Fees
First Claim
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1. A method of recognizing audible speech made up of a plurality of speech patterns comprising:

  • (a) providing a plurality of reference speech patterns, each said reference speech pattern being divided into a predetermined number of feature frames;

    (b) introducing a speech signal including at least one speech pattern to be recognized;

    (c) dividing said speech pattern to be recognized into said predetermined number of feature frames, said frames of said speech pattern to be recognized corresponding in time to said frames of each said reference pattern;

    (d) comparing said speech pattern to be recognized to said reference pattern, in only a portion of said predetermined number of feature frames to determine a coarse indication of relative correlation therebetween;

    (e) ranking said reference patterns as to relative degree of correlation with speech patterns to be recognized as represented by said coarse indication developed by said step of comparing, the highest ranking indicating the highest coarse indication of related correlation;

    (f) determining a final degree of correlation between only the highest ranked of said reference patterns and said speech pattern to be recognized to determine which reference pattern corresponds to said speech pattern to be recognized.

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