An improved vocal tract model of vowel production implementing piriform resonance and transvelar nasal coupling
An improved vocal tract model of vowel production implementing piriform resonance and transvelar nasal coupling
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DOI：
10.1109/icslp.1996.607763
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发表时间：
1996-10
期刊：
影响因子：
--
通讯作者：
J. Dang;K. Honda
中科院分区：
文献类型：
--
作者：
J. Dang;K. Honda
本文提出了一种改进的元音发声模型，该模型综合了梨状窝和横鼻翼耦合的声学效应。在这项研究中，声道模型是从受试者的MRI数据中推导出来的。根据MRI数据对梨状窝进行建模，将其作为声道的侧支。通过在三个受试者上进行的声学和力学实验，将膜壁模拟为由粘性阻力、质量和刚度组成的级联阻抗。计算了/a/和/i/元音在有无梨状窝和横鼻孔耦合的情况下的传递函数。结果表明，梨状窝和横横耦合在形成闭合元音的前两个共振峰中起重要作用，而梨状窝是影响开放元音共振峰的主要因素。通过对同一对象的计算传递函数和实际语音频谱的比较，表明改进的模型比传统模型具有更真实的性能。
The paper proposes an improved vocal tract model of vowel production, which incorporates acoustic effects of the piriform fossa and transvelar nasal coupling. In this study, the vocal tract model was derived from the MRI data of a subject. The piriform fossa was modeled based on the MRI data as a side branch of the vocal tract. The velum wall was modeled as a cascaded impedance of a viscous resistance, a mass and a stiffness, which were estimated by acoustic and mechanical experiments conducted on three subjects. Transfer functions of vowels /a/ and /i/ were computed under the conditions of with and without the piriform fossa and transvelar nasal coupling. The results showed that both the piriform fossa and transvelar coupling play important roles in shaping the first two formants for closed vowels, while the piriform fossa is the main factor affecting the formants of open vowels. By comparing computed transfer functions with real speech spectra for the same subject, it is clarified that our improved model gives a more realistic performance than the traditional model.