Time Varying Circuit Model of Speech Production System

本文研究了一种利用复声压分布测量非均匀声管面积函数的方法。实验结果表明，该方法具有合理的面积函数，适用于声道的面积估计。利用声门的二维模型，对二维气流进行了数值分析。在分析中，我们采用了非线性粘性流体流动的Navier-Stokes方程和有限元法。研究表明，声门下游会产生旋涡和湍流。我们还提出了一种新的声道壁阻抗模型，并在非圆形截面上考虑了壁振动效应。

We considered a method to measure the area function of a nonuniform acoustic tube using the distribution of complex sound pressure. The experemental results show reasonable area functions, and that this method is applicable to the area estimation of the vocal tract. Using a two-dimensional model of glottis, we performed numerical analysis of the two-dimensional air flow. In this analysis we have employed Navier-Stokes equation of nonlinear viscous fluid flows and FEM. We show that vortices and turbulent are generated on downstream from glottis. We have also proposed a new model of the wall impedance of vocal tract, and wall vibrational effect was considered in the non-circle cross section.