tailieunhanh - Báo cáo khoa học: "PROSODY, SYNTAX AND PARSING"

We describe the modification of a grammar to take advantage of prosodic information provided by a speech recognition system. This initial study is limited to the use of relative duration of phonetic segments in the assignment of syntactic structure, specifically in ruling out alternative parses in otherwise ambiguous sentences. Taking advantage of prosodic information in parsing can make a spoken language system more accurate and more efficient, if prosodicsyntactic mismatches, or unlikely matches, can be pruned. . | PROSODY SYNTAX AND PARSING John Bear and Patti Price SRI International 333 Ravenswood Avenue Menlo Park California 94025 Abstract We describe the modification of a grammar to take advantage of prosodic information provided by a speech recognition system. This initial study is limited to the use of relative duration of phonetic segments in the assignment of syntactic structure specifically in ruling out alternative parses in otherwise ambiguous sentences. Taking advantage of prosodic information in parsing can make a spoken language system more accurate and more efficient if prosodic-syntactic mismatches or unlikely matches can be pruned. We know of no other work that has succeeded in automatically extracting speech information and using it in a parser to rule out extraneous parses. 1 Introduction Prosodic information can mark lexical stress identify phrasing breaks and provide information useful for semantic interpretation. Each of these aspects of prosody can benefit a spoken language system SLS . In this paper we describe the modification of a grammar to take advantage of prosodic information provided by a speech component. Though prosody includes a variety of acoustic phenomena used for a variety of linguistic effects we limit this initial study to the use of relative duration of phonetic segments in the assignment of syntactic structure specifically in ruling out alternative parses in otherwise ambiguous sentences. It is rare that prosody alone disambiguates otherwise identical phrases. However it is also rare that any one source of information is the sole feature that separates one phrase from all competitors. Taking advantage of prosodic information in parsing can make a spoken language system more accurate and more efficient if pros die-syntactic mismatches or unlikely matches can be pruned out. Prosodic struc ture and syntactic structures are not of course completely identical. Rhythmic structures and the necessity of breathing influence the prosodic .