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Vocal Release Time of Mandarin Vowels at Different Pitch Levels
1School of International Studies, Henan Normal University, Xinxiang Municipality, Henan Province, China.
Objective:
To explore how vocal release time (VRT) varies when young adults articulate the three Chinese vertex vowels with increasingly higher pitch levels.
Study Design:
Sound pressure (SP) and electroglottographic (EGG) signals were recorded synchronously from 53 males and 53 females saying sustained /A/, /i/, /u/ at five equally spaced pitch heights, each being higher than the one before.
Methods:
About 3030 effective ST (semitone) and VRT measures were obtained. Statistical analyses of them were done by using SPSS 13.0 and Excel 2010.
Findings:
As mean STs increase linearly from pitch levels one to five, mean VRTs display a rise-fall pattern in a big group of subjects, but a fall-rise pattern in a small group of them. In both cases, pitch and VRT tend to present a curvilinear relationship, although VRT varies in opposite directions. And also, high vowels tend to have larger VRT than low vowels.
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