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Speech recognition apparatus and method

  • US 4,319,085 A
  • Filed: 04/08/1980
  • Issued: 03/09/1982
  • Est. Priority Date: 04/08/1980
  • Status: Expired due to Term
First Claim
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1. Apparatus which receives input spoken vocabulary words during a training phase of operation and subsequently recognizes received input spoken command words, comprising:

  • feature extraction means for processing received input words and generating digital feature signals dependent upon the features present in said input words;

    means for forming, for each vocabulary word, a time dependent reference array having digital information at each array position representative of the presence or absence of a particular feature signal at a particular time slot during at least a predetermined fraction of a number of training utterances of said vocabulary word and also representative of the consistency of occurrence of said particular feature signal at said particular time slot during said number of training utterances of said vocabulary word;

    means for forming a time dependent command word feature array having digital information at each array position representative of the presence or absence of a particular feature signal at a particular time slot during a command word candidate;

    means for comparing, member-by-member, the command word feature array with the reference array for each vocabulary word; and

    means for selecting the vocabulary word those reference array yields the highest correlation with said command word feature array.

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