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Generating a task-adapted acoustic model from one or more different corpora

  • US 7,006,972 B2
  • Filed: 03/20/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 03/20/2002
  • Status: Active Grant
First Claim
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1. A method of generating a task-dependent acoustic model from a task-independent (TI) training corpus that includes an acoustic representation of an utterance and a sequence of transcribed words corresponding to the acoustic representation, the method comprising:

  • deriving a task relevance measure for each word in the TI training corpus, indicative of a relevance of the words to a task; and

    generating a task-dependent (TD) acoustic model (AM) based on the TI training corpus and the task relevance measures for the words in the TI training corpus, by training a task-independent (TI) AM based on the TI training corpus, the TI AM including words from the TI training corpus and associated AM parameters, and weighting the AM parameters with the task relevance measures for the words corresponding to the AM parameters.

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