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

  • US 7,263,487 B2
  • Filed: 09/29/2005
  • Issued: 08/28/2007
  • Est. Priority Date: 03/20/2002
  • Status: Expired due to Fees
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;

    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;

    generating a task-dependent (TD) acoustic model (AM) based on the TI AM trained from the TI training corpus and the task relevance measures for the words in the TI training corpus; and

    storing the TD AM for use in performing the task.

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