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Methods for reducing spurious insertions in speech recognition

  • US 7,409,345 B2
  • Filed: 04/04/2003
  • Issued: 08/05/2008
  • Est. Priority Date: 04/04/2003
  • Status: Active Grant
First Claim
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1. A method of automatically generating a phonetic baseform from a spoken utterance, the method comprising the steps of:

  • obtaining a stream of acoustic observations representing the spoken utterance;

    generating a sequence of subphone units, wherein candidate subphones that relate to the same speech event and that overlap in time are merged into a single candidate subphone, wherein a score associated with the single candidate subphone is equal to the sum of scores associated with the merged candidate subphones such that a score associated with a longer-lasting speech event is enhanced as compared with a score associated with a shorter-lasting speech event, and further wherein the sequence of subphone units represents candidate subphone units substantially maximizing a likelihood associated with the stream of acoustic observations; and

    converting the sequence of subphone units into a phonetic baseform.

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