Speech Understanding Systems
Quarterly technical progress rept. no. 4, 1 Aug-29 Oct 1975
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
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This report describes recent progress of the BBN speech understanding. The BBN speech understanding project is an effort to develop a continuous speech understanding system which uses syntactic, semantic and pragmatic support from higher level linguistic knowledge sources to compensate for the inherent acoustic indeterminacies in continuous spoken utterances. These knowledge sources are integrated with sophisticated signal processing and acoustic-phonetic analysis of the input signal, to produce a total system for understanding continuous speech. The system contains components for signal analysis, acoustic parameter extraction, acoustic-phonetic analysis of the signal, phonological expansion of the lexicon, lexical matching and retrieval, syntactic analysis and prediction, semantic analysis and prediction, pragmatic evaluation and prediction, and inferential fact retrieval and question answering, as well as synthesized text or spoken output. The report summarizes the fourth year of a five-year development effort.