Perception of Synthetic Speech by Nonnative Speakers of English

Abstract

Nonnative speakers of English listened to natural and synthetic speech materials. All natural speech material was spoken by a native male speaker of American English. The synthetic speech was produced by the MITalk-79 system for the first experiment and by the Prose 2000 V2.1 text-to-speech system for the second experiment. Results from Experiment 1 indicated that nonnative speakers show higher levels of performance when listening to natural speech than when listening to synthetic speech. However, nonnative speakers did not reach the level of performance of native speakers for either natural or synthetic speech. Experiment 2 provided further evidence that nonnative speakers fail to reach the same level of performance when listening to synthetic speech as native speakers. Performance of nonnative speakers on a dictation task showed high positive correlations with their general English language ability as measured by two standardized tests. Results indicate the importance of language background and experience in the perception of speech, particularly synthetic and digitally encoded speech.