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Speech recognition system

  • US 4,718,094 A
  • Filed: 03/27/1986
  • Issued: 01/05/1988
  • Est. Priority Date: 11/19/1984
  • Status: Expired due to Term
First Claim
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1. In a speech recognition system which represents each vocabulary word or a portion thereof by at least one sequence of phones wherein each phone corresponds to a respective phone machine, each phone machine having associated therewith (a) a plurality of transitions and (b) actual label output probabilities, each actual label probability representing the probability that a subject label is generated at a given transition in the phone machine, a method of performing an acoustic match between phones and a string of labels produced by an acoustic processor in response to a speech input, the method comprising the steps of:

  • forming simplified phone machines which includes the step of replacing by a single specific value the actual label probabilities for a given label at all transitions at which the given label may be generated in a particular phone machine; and

    determining the probability of a phone generating the labels in the string based on the simplified phone machine corresponding thereto.

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