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Speech & natural language publications June 1, 2000 Conference Paper

Word-Level Rate of Speech Modeling Using Rate-Specific Phones and Pronunciations

SRI International June 1, 2000

Abstract

Variations in rate of speech (ROS) produce changes in both spectral features and word pronunciations that affect ASR systems. To cope with these effects, we propose to use rate-specific phone models and pronunciations for ROS modeling at the word level. Words are given three types of pronunciations — fast, slow, and medium — consisting of rate-specific phone models, respectively. This approach allows us to model within-sentence rate variation. To better model coarticulation effects, we introduce the concept of zero-length phones, which enables short phones to be skipped without having to change their neighboring phones’ contexts. A data-driven approach is used to prune the pronunciation dictionary derived from rules for phone reduction. […]

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