Syntactic analysis for large vocabulary speech recognition using a context-free covering grammar

The authors describe a syntactive component for large vocabulary speech recognition that incorporates a context-free covering grammar as the language model. The component comprises two modules: a preprocessing module and a syntactic analysis module. The preprocessing module consists of a lexical and a grammar preprocessor. The preprocessors facilitate grammar development. The syntactic analysis module consists of an error correcting maximum likelihood Cocke-Younger-Kasami parser and a context-free covering grammar. The parsar determines the sentence of maximum likelihood accepted by the grammar with respect to a word log likelihood matrix supplied b the acoustic/phonetic component of the speech recognition system. The effectiveness of this type of syntactic analysis was tested in a simulation using a 1040 word vocabulary. Results and error correcting examples are given