Measurement of temporal changes in vocal tract area function from 3D cine-MRI data
Measurement of temporal changes in vocal tract area function from 3D cine-MRI data
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DOI：
10.1121/1.2151823
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发表时间：
2006-02-01
影响因子：
2.4
通讯作者：
Fujimoto, I
中科院分区：
文献类型：
--
作者：
Takemoto, H;Honda, K;Fujimoto, I
基于同步采样方法开发了一种3D电影mri技术[Masaki等人，J. Acoust]。Soc。日本。[E] 20, 375-379(1999)]测量日语短话语/aiueo/时声道区域功能的时间变化。在男性说话者重复640次的话语后，获得头颈体积的时间序列，并从中逐帧提取区域函数。一项基于区域的分析表明，前后腔的体积倾向于相互变化，喉部和硬腭后缘附近的区域在整个发音过程中几乎是恒定的。从所有的区域函数中计算出低四个共振峰，并与自然语音的共振峰进行比较。在所有帧中，计算和测量的共振峰之间的平均绝对百分比误差为4.5%。五个元音的声道形状与静态MRI方法的声道形状的比较提示了声道MRI观察的一个问题：由于重力效应，静态MRI数据容易导致与自然声道几何形状的偏离。(c) 2006年美国声学学会。
A 3D cine-MRI technique was developed based on a synchronized sampling method [Masaki et al., J. Acoust. Soc. Jpn. E 20, 375-379 (1999)] to measure the temporal changes in the vocal tract area function during a short utterance /aiueo/ in Japanese. A time series of head-neck volumes was obtained after 640 repetitions of the utterance produced by a male speaker, from which area functions were extracted frame-by-frame. A region-based analysis showed that the volumes of the front and back cavities tend to change reciprocally and that the areas near the larynx and posterior edge of the hard palate were almost constant throughout the utterance. The lower four formants were calculated from all the area functions and compared with those of natural speech sounds. The mean absolute percent error between calculated and measured formants among all the frames was 4.5%. The comparison of vocal tract shapes for the five vowels with those from the static MRI method suggested a problem of MRI observation of the vocal tract: data from static MRI tend to result in a deviation from natural vocal tract geometry because of the gravity effect. (c) 2006 Acoustical Society of America.