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Speech recognition apparatus having a speech coder outputting acoustic prototype ranks

  • US 5,222,146 A
  • Filed: 10/23/1991
  • Issued: 06/22/1993
  • Est. Priority Date: 10/23/1991
  • Status: Expired due to Term
First Claim
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1. A speech coding apparatus comprising:

  • means for measuring the value of at least one feature of an utterance over each of a series of successive time intervals to produce a series of feature vector signals representing the feature values;

    means for storing a plurality of prototype vector signals, each prototype vector signal having at least one parameter value and having a unique identification value;

    means for comparing the closeness of the feature value of a first feature vector signal to the parameter values of the prototype vector signals to obtain prototype match scores for the first feature vector signal and each prototype vector signal;

    ranking means for associating a first-rank score with the prototype vector signal having the best prototype match score, and for associating a second-rank score with the prototype vector signal having the second best prototype match score; and

    means for outputting at least the identification value and the rank score of the prototype vector signal having the first-rank score, and the identification value and the rank score of the prototype vector signal having the second-rank score, as a coded utterance representation signal of the first feature vector signal.

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