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Báo cáo khoa học: "Prosodic Aids to Syntactic and Semantic Analysis of Spoken English"

Prosody can be useful in resolving certain lexical and structural ambiguities in spoken English. In this paper we present some results of employing two types of prosodic information, namely pitch and pause, to assist syntactic and semantic analysis during parsing. morphosyntactic interpretations to one correct analysis without error (p. 262). (Steedman 1990) explores taking advantage of intonational structure in spoken sentence understanding in the combinatory categorial grammar formalism. (Bear & Price 1990) discusses integrating prosody and syntax in parsing spoken English, relative duration of phonetic segments being the one aspect of prosody examined. . | Prosodic Aids to Syntactic and Semantic Analysis of Spoken English Chris Rowles and Xlumlng Huang Al Systems Section Australia and Overseas Telecommunications Corporation Telecommunications Research Laboratories PO Box 249 Clayton Victoria 3168 Australia Internet c.rowles@tri.oz.au ABSTRACT Prosody can be useful in resolving certain lexical and structural ambiguities in spoken English. In this paper we present some results of employing two types of prosodic information namely pitch and pause to assist syntactic and semantic analysis during parsing. 1. INTRODUCTION In attempting to merge speech recognition and natural language understanding to produce a system capable of understanding spoken dialogues we are confronted with a range of problems not found in text processing. Spoken language conversations are typically more terse less grammatically correct less well-structured and more ambiguous than text Brown Yule 1983 . Additionally speech recognition systems that attempt to extract words from speech typically produce word insertion deletion or substitution errors due to incorrect recognition and segmentation. The motivation for our work is to combine speech recognition and natural language understanding NLU techniques to produce a system which can in some sense understand the intent of a speaker in telephone-based information seeking dialogues. As a result we are interested in NLU to improve the semantic recognition accuracy of such a system but since we do not have explicit utterance segmentation and structural information such as punctuation in text we have explored the use of prosody. Intonation can be useful in understanding dialogue structure c.f. Hirschberg Pierrehumbert 1986 but parsing can also be assisted. Briscoe Boguraev 1984 suggests that if prosodic structure could be derived for the noun compound Boron epoxy rocket motor chambers then their parser LEXICAT could reduce the fourteen licit morphosyntactic interpretations to one correct analysis without .