tailieunhanh - Báo cáo khoa học: "THE CONTRIBUTION OF PARSING TO PROSODIC PHRASING IN AN EXPERIMENTAL TEXT-TO-SPEECH SYSTEM"

While various aspects of syntactic structure have been shown to bear on the determination of phraselevel prosody, the text-to-speech field has lacked a robust working system to test the possible relations between syntax and prosody. We describe an implemented system which uses the deterministic parser Fidditch to create the input for a set of prosody rules. | THE CONTRIBUTION OF PARSING TO PROSODIC PHRASING IN AN EXPERIMENTAL TEXT-TO-SPEECH SYSTEM Joan Bachenko Eileen Fitzpatrick c. E. Wright AT T Bell Laboratories Murray Hill New Jersey 07974 ABSTRACT While various aspects of syntactic structure have been shown to bear on the determination of phraselevel prosody the text-to-speech field has lacked a robust working system to test the possible relations between syntax and prosody. We describe an implemented system which uses the deterministic parser Fidditch to create the input for a set of prosody rules. The prosody rules generate a prosody tree that specifies the location and relative strength of prosodic phrase boundaries. These specifications are converted to annotations for the Bell Labs text-to-speech system that dictate modulations in pitch and duration for the input sentence. We discuss the results of an experiment to determine the performance of our system. We are encouraged by an initial 5 percent error rate and we see the design of the parser and the modularity of the system allowing changes that will upgrade this rate. INTRODUCTION We describe an experimental text-to-speech system that uses a deterministic parser and prosody rules to generate phrase-level pitch and duration information for English input. This information is used to annotate the input sentence which is then processed by the text-to-speech programs currently under development at Bell Labs. In constructing the system our goal has been to test the hypotheses i that information available in the syntax tree in particular grammatical functions such as subject-predicate and head-complement is by itself useful in determining prosodic phrasing for synthetic speech and ii that it IS possible to use a syntactic parser that specifies grammatical functions io determine prosodic phrasing for synthetic speech. Although certain connections between syntax and prosody are well-known . the influence of part of speech on stress in words like progress or the .