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Study on Refined Mechanism Model of Phonation : A Model Taking Vibration of the Vocal Folds and the Resonance in the Vocal Tract into Account

发声细化机制模型研究:考虑声带振动和声带共振的模型

基本信息

批准号：
10650168
负责人：
MATSUZAKI Yuji
金额：
$ 2.24万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In voice production of human being, source is produced by self-excited oscillation occurred due to interaction of motion of the vocal folds and a flow through the glottis which is a slot between the left and right vocal fold. In our previous analyses we have collected fundamental data of separated and vibratory air flow which relates the self-excited oscillation directly and performed numerical analysis of normal phonation.Mechanical analyses taking vocal-fold vibration into account is expected to contribute the study on phonation from the mechanical point of view, especially, diagnosis of complicated voice disorders due to property imbalance of the left and right vocal fold caused by diseases such as polyps, and development of artificial-larynxes and esophageal-speech-techniques in which source sound is produced when cancerous vocal folds have been excised.In order to investigate the mechanism of complicated behaviors in the voice disorders due to property imbalance of the left and right vocal fold caused by the diseases, we extended our experimental and theoretical model phonation.We performed the following studies during the term of the project (FY1998-FY1999) :1. We designed a quasi-two-dimensional channel model with an asymmetrical vibratory constriction. We purchased a Laser displacement meter to measure the motion of the constriction and high-accuracy pressure transducers and amplifiers for accurate measurement, and collected fundamental but refined data on steady and unsteady static pressures, flow rate, and so forth.2. Based on the experimental data, we proposed a theoretical model of the vocal folds vibrating asymmetrically. Using this theoretical model, we numerically calculated vibratory pressure and velocity distribution, and so forth.3. We measured normal and abnormal voices, compared the experimental data with the numerical results, and evaluated the measuring methods and the proposed theoretical model.

在人类发声过程中，声源是由声带运动与声门气流相互作用而产生的自激振荡产生的，声门是左右声带之间的缝隙。在前面的分析中，我们收集了与自激振荡直接相关的气流分离和振动的基本数据，并对正常发声进行了数值分析，考虑到声褶振动的力学分析有望从力学角度对发声进行研究，特别是，诊断息肉等疾病引起的左右声带性质不平衡引起的复杂嗓音障碍，以及人造喉和语音的发展声带癌切除术后产生源音的技术。为了探讨声带性质失衡引起的嗓音障碍中复杂行为的机制，本研究在1998 - 1999年期间，对本研究的实验和理论发声模型进行了扩展，主要完成了以下研究工作：1。我们设计了一个准二维的渠道模型与不对称的振动收缩。我们购买了激光位移计来测量收缩部的运动，并购买了高精度压力传感器和放大器来进行精确测量，并收集了稳定和非稳定静压、流量等基本但精细的数据。2.根据实验数据，我们提出了一个声带非对称振动的理论模型。利用该理论模型，数值计算了振动压力、速度分布等.我们测量了正常和异常的声音，比较实验数据与数值计算结果，并评估的测量方法和提出的理论模型。