Orlikoff R F
Laryngology Laboratory, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
J Voice. 1995 Jun;9(2):173-81. doi: 10.1016/s0892-1997(05)80251-6.
Previous studies have reported differences in vocal fundamental frequency perturbation (jitter) and amplitude perturbation (shimmer) measures as a function of vowel type. However, it is not clear from those studies whether these effects derive from modifications in the shape of the vocal tract or from intrinsic vowel differences in mean fundamental frequency and vocal amplitude. The present study sought to address this issue using simultaneously obtained acoustic and electroglottographic (EGG) signals. Ten normal adult men and 10 normal adult women prolonged three maximally stable productions of the vowels [symbol: see text]. Vocal sound pressure level was maintained at 74 +/- 4 dB, while mean fundamental frequency was maintained at 110 and 220 Hz +/- 0.5 st for the male and female subjects, respectively. Results indicated that when vocal frequency and intensity are controlled, acoustic and EGG measures of mean jitter and shimmer do not show a significant vowel effect.
以往的研究报告了不同元音类型的嗓音基频微扰（抖动）和幅度微扰（闪烁）测量结果存在差异。然而，从这些研究中尚不清楚这些影响是源于声道形状的改变，还是源于平均基频和嗓音幅度方面固有的元音差异。本研究试图通过同时获取声学信号和电声门图（EGG）信号来解决这一问题。10名正常成年男性和10名正常成年女性分别延长发出元音[符号：见原文]的三种最大稳定发音。男性和女性受试者的嗓音声压级分别维持在74±4分贝，而平均基频分别维持在110赫兹和220赫兹±0.5半音。结果表明，当嗓音频率和强度得到控制时，平均抖动和闪烁的声学测量和EGG测量均未显示出显著的元音效应。
