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Context free grammar engine for speech recognition system

  • US 6,957,184 B2
  • Filed: 12/29/2000
  • Issued: 10/18/2005
  • Est. Priority Date: 07/20/2000
  • Status: Expired due to Term
First Claim
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1. A method of managing grammars used in a speech recognition system, comprising:

  • loading a first grammar in a context-free grammar(CFG) engine;

    implementing an engine-independent SR interface between the CFG engine and a speech recognition (SR) engine;

    communicating words in the first grammar to the SR engine through the SR interface;

    notifying the SR engine, through the SR interface, of rules in the first grammar;

    representing the rules in the first grammar to the SR engine through the SR interface;

    implementing an application-independent application interface between the CFG engine and an application;

    receiving from the application, through the application interface, a change indication, indicating a change to the first grammar; and

    determining, in the CFG engine, whether content of a rule in the first grammar is to be changed, based on the change indication; and

    if so, providing an invalidation indication to the SR engine, through the SR interface, indicating the first grammar is to be invalidated.

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