Lester Rosemary A, Story Brad H
Department of Speech, Language, and Hearing Sciences, University of Arizona, Tucson, Arizona 85721, USA.
J Acoust Soc Am. 2015 Aug;138(2):953-63. doi: 10.1121/1.4927561.
The purpose of this study was to determine if adjustments to the voice source [i.e., fundamental frequency (F0), degree of vocal fold adduction] or vocal tract filter (i.e., vocal tract shape for vowels) reduce the perception of simulated laryngeal vocal tremor and to determine if listener perception could be explained by characteristics of the acoustical modulations. This research was carried out using a computational model of speech production that allowed for precise control and manipulation of the glottal and vocal tract configurations. Forty-two healthy adults participated in a perceptual study involving pair-comparisons of the magnitude of "shakiness" with simulated samples of laryngeal vocal tremor. Results revealed that listeners perceived a higher magnitude of voice modulation when simulated samples had a higher mean F0, greater degree of vocal fold adduction, and vocal tract shape for /i/ vs /ɑ/. However, the effect of F0 was significant only when glottal noise was not present in the acoustic signal. Acoustical analyses were performed with the simulated samples to determine the features that affected listeners' judgments. Based on regression analyses, listeners' judgments were predicted to some extent by modulation information present in both low and high frequency bands.
本研究的目的是确定对声源[即基频（F0）、声带内收程度]或声道滤波器（即元音的声道形状）进行调整是否会降低对模拟喉音震颤的感知，并确定听众的感知是否可以通过声学调制的特征来解释。这项研究是使用语音产生的计算模型进行的，该模型允许对声门和声道配置进行精确控制和操纵。42名健康成年人参与了一项感知研究，该研究涉及对模拟喉音震颤样本的“抖动”程度进行成对比较。结果显示，当模拟样本具有较高的平均F0、较大的声带内收程度以及/i/与/ɑ/的声道形状时，听众会感知到更高程度的语音调制。然而，只有当声学信号中不存在声门噪声时，F0的影响才显著。对模拟样本进行了声学分析，以确定影响听众判断的特征。基于回归分析，听众的判断在一定程度上可以通过低频和高频带中存在的调制信息来预测。
