Paper: Which Words Are Hard to Recognize? Prosodic Lexical and Disfluency Factors that Increase ASR Error Rates

ACL ID P08-1044
Title Which Words Are Hard to Recognize? Prosodic Lexical and Disfluency Factors that Increase ASR Error Rates
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2008
Authors

Many factors are thought to increase the chances of misrecognizing a word in ASR, including low frequency, nearby disfluencies, short duration, and being at the start of a turn. However, few of these factors have been for- mally examined. This paper analyzes a variety of lexical, prosodic, and disfluency factors to determine which are likely to increase ASR er- ror rates. Findings include the following. (1) For disfluencies, effects depend on the type of disfluency: errors increase by up to 15% (ab- solute) for words near fragments, but decrease by up to 7.2% (absolute) for words near repeti- tions. This decrease seems to be due to longer word duration. (2) For prosodic features, there are more errors for words with extreme values than words with typical values. (3) Although our results ar...