Recursive finite state grammar

Details Recursive finite state grammar Recursive finite state grammar

G - Physics

10

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G10L 15/18 (2006.01) G10L 5/06 (1995.01)

Patent

CA 2151371

A method and means for performing speech recognition are described. The method and means include multiple finite state grammars. The multiple finite state grammars include at least one global finite state grammar and at least one sub-finite state grammar. Each of the multiple finite state grammars includes multiple states and at least one transition arranged in a network. The transitions in the network are capable of including either terminals or non-terminals. Each of the terminals is associated with an acoustic model, while each of the non-terminals is associated with a call to one of the sub-finite state grammars. The present invention also includes a recognition engine which performs the recognition by traveling through the global finite state grammar. As terminals are encountered, the recognition engine matches the acoustic model of the terminal to the speech signals. As non-terminals are encountered, the recognition engine calls the sub-finite state grammar associated with the non-terminal and continues performing recognition by traversing the sub-finite state grammar. In traversing the sub-finite state grammar, the recognition engine matches the acoustic model to the speech signals to continue with the recognition. Upon traversing the sub-finite state grammar, the recognition engine returns to and continues traversing the global finite state grammar at the location of the call. In this manner, the speech signals are matched against the acoustic models in the global and sub-finite state grammars to generate textual output. I

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