Published online by Cambridge University Press: 21 September 2012
This study examined intelligibility of twelve American English vowels produced by English, Chinese, and Korean native speakers in quiet and speech-shaped noise in which vowels were presented at six sensation levels from 0 dB to 10 dB. The slopes of vowel intelligibility functions and the processing time for listeners to identify vowels were dependent on speakers’ language backgrounds and non-native speakers’ vowel intelligibility in quiet. These results indicated that noise background affected non-native speakers’ vowel intelligibility more greatly than native speakers, possibly due to the acoustic deviations in non-native speech and lack of listeners’ experience to non-native produced speech.
Special thanks were given to Chia-Tsen Chen for her help in data analysis. The authors also would like to thank Catherine Rogers for her comments on this study. The authors are grateful to three anonymous reviewers for their constructive comments on the earlier drafts of this manuscript. This study was supported by the University of Texas at Austin Research Grant.