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Progressive application of knowledge sources in multistage speech recognition

  • US 8,386,251 B2
  • Filed: 06/08/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 06/08/2009
  • Status: Active Grant
First Claim
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1. A method to be executed at least in part in a computing device for providing multistage speech recognition, the method comprising:

  • receiving an utterance from a speaker;

    performing a first pass speech recognition on the utterance employing at least one algorithm including a gender detection algorithm and a feature MLLR (fMLLR) algorithm executed sequentially;

    adapting the at least one algorithm based on a result of the first pass speech recognition;

    performing a second pass speech recognition on the utterance employing the adapted at least one algorithm wherein at least one algorithm is adapted in a progressive manner at the second pass based on a result of the first pass of speech recognition by constraining at least one of an acoustic model and a language model associated with the at least one algorithm, wherein constraining at least one of the acoustic model and the language model associated with the algorithms includes reducing a search space for the at least one algorithm; and

    employing the adapted at least one algorithm for performing speech recognition on subsequent utterances from the same speaker.

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