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Integrating keyword spotting with graph decoder to improve the robustness of speech recognition

  • US 7,058,575 B2
  • Filed: 06/27/2001
  • Issued: 06/06/2006
  • Est. Priority Date: 06/27/2001
  • Status: Expired due to Fees
First Claim
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1. A system, comprising:

  • a graph-decoder based speech recognition mechanism for recognizing a word sequence, from input speech data, based on a language model using a graph decoder, the graph-decoder based speech recognition mechanism having a recognition acceptance mechanism to determine whether the graph decoder based speech recognition mechanism fails; and

    a keyword based speech recognition mechanism for recognizing, when the graph-decoder based speech recognition mechanism fails, the word sequence, the keyword based speech recognition mechanism including;

    a keyword spotting mechanism to detect, using at least one acoustic model, at least one keyword from the input speech data based on a keyword list; and

    a keyword based recognition mechanism to recognize the word sequence using the at least one keyword, detected by the keyword spotting mechanism, based on the language model.

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