Research on Acoustic Approach of Speech Quality Model

在语音生成系统中，我们研究了声道三维图形参数与真实的语音质量之间的关系。对于不同音高重音的元音作为声源的频率变化，对声门闭合对应的语音波形部分进行频谱分析;使用几个男性成年人的数据。由于声门闭合时的样本量很少，难以用有序方法进行分析，因此我们采用了我们的新方法--映射短时分析法。使用我们的方法，我们可以稳定地估计共振峰在声门关闭，并表明，即使是孤立的元音共振峰可以移动的音高变化。利用有限元法对MRI测量的声带形状模型进行了声学分析的数值模拟，研究了形状参数、声门附近的小窦、声门附近的小窦和声道壁阻抗的频谱特性。作为结果，我们表明，频谱的形状参数和小窦的变化，并在嘴唇的辐射阻抗的影响，特别是在较高的共振峰。

In the speech production system, we investigated the relation between the parameters of 3-D figure of the vocal tract and the speech quality of real speech. For vowels with different pitch accent as frequency variation on acoustic source, spectral analysis is performed for the part of the speech waveform corresponding the glottal closure ; the data of the several male adults are used. Since the number of the sampled data is very small in the glottal closure, it is so diffcult to analyze the data using ordinal method, we adopted our new method of the short-time analysis method using the mapping. Using our method, we could estimate stably the formant in the glottal closure, and showed that even for isolated vowels the formant can be moved by the pitch variation. Moreover, we showed a new estimation method for the glottal wave by using our analysis algorithm, and excellent result on the estimation.Using Finite Element Method (FEM), we performed numerical simulation of acoustical analysis for the shape model of the vocal tract which was measured by MRI.By this FEM simulation, we investigated the effect of shape parameters, small sinuses near the glottis, and wall impedance of vocal tract for the spectral characteristics. As the result, we showed that the spectrum is influenced by the variation of the shape parameters and the small sinuses, and by the radiation impedance at the lips ; especially on higher formants.