Individual variation of the hypopharyngeal cavities and its acoustic effects
Individual variation of the hypopharyngeal cavities and its acoustic effects
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DOI：
10.1250/ast.26.16
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发表时间：
2005-01-01
影响因子：
0.7
通讯作者：
Takemoto, Hironori
中科院分区：
文献类型：
--
作者：
Kitamura, Tatsuya;Honda, Kiyoshi;Takemoto, Hironori
通过对喉咽部的形态学测量，探讨了声道细微结构与说话人特征之间的关系。下咽包括喉管和梨状窝的双侧腔。本研究以四位受试者持续发出五个日本元音时的核磁共振影像资料，分析喉咽部说话者内与说话者间的变化。中矢状面和横向平面的形态分析表明，下咽部的形状是相对稳定的，无论元音类型，相对较大的扬声器间的变化，这些结果是定量证实了一个简单的相似性方法。下咽部的小的扬声器内变化通过使用高质量的MRI数据的进一步形态学分析得到证实，所述高质量的MRI数据是通过使用“发音同步方法”和“定制喉线圈”获得的。“此外，通过使用传输线模型来估计下咽部的个体变化的声学效应。将其中一个受试者下咽部以上的声道面积函数与其他受试者的下咽腔相结合，并计算它们的传递函数。结果表明，喉咽的扬声器间的变化影响频谱的频率范围超过约2.5 kHz。
Morphological measurements of the hypopharynx are conducted to investigate the correlation between fine structures of the vocal tract and speaker characteristics. The hypopharynx includes the laryngeal tube and bilateral cavities of the piriform fossa. MRI data during sustained phonation of the five Japanese vowels by four subjects are obtained to analyze intra-and inter-speaker variation of the hypopharynx. Morphological analysis on the mid-sagittal and transverse planes revealed that the shape of the hypopharynx was relatively stable, regardless of vowel type, in contrast to relatively large inter-speaker variation, and these results are confirmed quantitatively by a simple similarity method. The small intra-speaker variation of the hypopharynx is confirmed by further morphological analysis using high-quality MRI data for one of the subjects, obtained by using the "phonation-synchronized method" and "custom laryngeal coil." Furthermore, acoustical effects of the individual variation of the hypopharynx are estimated by using a transmission line model. Vocal tract area function of one of the subjects above the hypopharynx is combined with the hypopharyngeal cavities of other subjects, and their transfer functions are calculated. The results show that the inter-speaker variation of the hypopharynx affects spectra in the frequency range beyond approximately 2.5 kHz.