Neely Kimberly D, Bunton Kate, Story Brad H
University of Arizona, Tucson.
J Speech Lang Hear Res. 2016 Dec 1;59(6):1327-1334. doi: 10.1044/2016_JSLHR-S-14-0331.
This study used a computational vocal tract model to investigate the relationship of diphthong duration and vocal tract movement magnitude to measures of the F2 trajectory in CV words.
Three words (bough, boy, and buy) were simulated on the basis of an adult female vocal tract model, in which the model parameters were estimated from audio recordings of a female talker. Model parameters were then modified to generate 35 simulations of each word corresponding to 7 different durations and 5 movement magnitude settings. In addition, these simulations were repeated with vocal tract lengths representative of an adult male and an approximately 6-year-old child.
On the basis of univariate analysis, measures of frequency predicted changes in magnitude, and temporal measures predicted changes in speaking rate consistent with the hypothesis. The combined effects of duration and magnitude showed that F2 was more sensitive to changes in magnitude at shorter word durations compared with longer word durations. This finding held across words and vocal tract length.
Results suggest that there is an interaction between duration and magnitude that affects the slope of the F2 trajectory. The next step is to relate kinematics to F2 trajectory output using real speakers.
本研究使用一个声道计算模型来探究双元音时长和声道运动幅度与CV音节词中F2轨迹测量值之间的关系。
基于成年女性声道模型模拟了三个单词（bough、boy和buy），其中模型参数是根据一名女性说话者的音频记录估算得出的。然后修改模型参数，对每个单词生成35种模拟，分别对应7种不同时长和5种运动幅度设置。此外，还使用代表成年男性和一名约6岁儿童的声道长度重复了这些模拟。
基于单变量分析，频率测量值预测了幅度变化，时间测量值预测了与假设一致的语速变化。时长和幅度的综合影响表明，与较长单词时长相比，F2在较短单词时长时对幅度变化更敏感。这一发现适用于所有单词和声道长度。
结果表明时长和幅度之间存在相互作用，影响F2轨迹的斜率。下一步是使用真实的说话者将运动学与F2轨迹输出联系起来。
