Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53706, USA.
J Voice. 2012 Nov;26(6):698-705. doi: 10.1016/j.jvoice.2011.09.012. Epub 2012 May 11.
The purpose of this study was to investigate the effect of vocal fold adduction on voice quality in an ex vivo larynx model.
Prospective, repeated-measures experiments.
Ten excised canine larynges were mounted on an excised larynx phonation system and measurements were recorded for three different vocal fold adduction levels. Acoustic perturbation measurements of jitter, shimmer, and signal-to-noise ratio (SNR) were calculated from recorded radiated sound histories.
Ex vivo experiments indicated that statistically significant increases in the means of jitter (P=0.005), shimmer (P=0.002), and SNR (P=0.011) measures decreased with respect to vocal fold adduction as the independent variable. Theoretical results showed that the direct current (DC) and alternating current (AC) component of glottal area increased monotonically with prephonatory glottal area.
Acoustic perturbation increased with the degree of vocal fold abduction. Ex vivo larynx measurements suggested that a hyperadducted state may be acoustically best. This may be explained theoretically by an increase in DC/AC ratio as the prephonatory area is increased.
本研究旨在探讨在离体喉模型中声带内收对嗓音质量的影响。
前瞻性、重复测量实验。
将 10 个离体犬喉置于离体喉发声系统上，并记录三种不同声带内收水平的测量值。从记录的辐射声历史中计算出抖动、颤抖和信噪比 (SNR) 的声扰测量值。
离体实验表明，随着声带内收作为自变量的增加，抖动（P=0.005）、颤抖（P=0.002）和 SNR（P=0.011）测量值的均值呈统计学显著降低。理论结果表明，声门区的直流（DC）和交流（AC）分量随预发声门区单调增加。
声扰随声带外展程度的增加而增加。离体喉测量结果表明，过度内收状态在声学上可能是最佳的。这可以通过 DC/AC 比值随着预发声门区的增加而增加来从理论上解释。
