QUANTITATIVE ANALYSIS OF ARTICULATORY DYNAMICS AND ITS CLINICAL APPLICATIONS

1.在声道水平上的发音动力学分析下颌骨位置的自动识别结果表明，根据下颌张开的程度，日语元音可以分为两组。为了分析舌运动，采用超声观察方法。将超声探头置于受试者的颌下三角下，观察舌背的矢状构型。此外，舌动态沿着两个选定的轴paradricular到舌背进行了检测。研究发现，元音共振峰的声学时程与舌动力学之间有很好的对应关系。小脑性共济失调的异常发音动力学最好表现为位移和速度方面的发音运动的不一致，这两者都是由本分析系统量化的。肌萎缩侧索硬化症的发音模式的特点是减少的范围和速度的运动。实验证明该系统对发音训练是有效的.喉动力学分析立体声分析显示，声带在吸气时延长。为了分析声带的振动模式，使用了一个数字记录系统，使用固态图像传感器连接到一个传统的范围。结果发现，在振动的闭合相和开放相之间，声带边缘位移的声学特性以及时间过程是不同的。在呼吸性声音嘶哑的情况下，声门关闭不完全与高频声能的减少被揭示。该系统被证明是有用的临床分析的声乐病理。

1. Analysis of articulatory dynamics at the vocal tract level The result of an automatic identification of the position of the mandible indicated that the Japanese vowels could be divided into two groups depending on the degree of jaw opening. For analyzing tongue movements, the ultrasonic observation method was employed. The ultrasonic probe was held under the subject's submandibular triangle to observe the sagittal configuration of the tongue dorsum. Also, tongue dynamics along two selected axes parpendicular to the tongue dorsum were detected. It was found that there was a good correspondence between the acoustic time course of vowel formants and tongue dynamics. Abnormal articulatory dynamics of cerebellar ataxia were best represented as an inconsistency of articulatory movements in terms of displacement and velocity both of which were quantified by the present analysis system. The articulatory pattern of amyotrophic lateral sclerosis was characterized by the decrease in the range and velocity of movements. The system proved effective for articulatory training.2. Analysis of laryngeal dynamics Stereoscopic analysis revealed that the vocal fold was elongated during inspiration. For analyzing vibratory patterns of the vocal folds, a digital recording system using solid-state image sensor attached to a conventional scope was used. It was found that there was a difference in acoustic characteristic as well as temporal course of the displacement of the vocal fold margin between the closed and open phases of the vibration. In the case of breathy hoarseness, incomplete glottis closure associated with the decrease in high frequency acoustic energy was revealed. The system proved useful for clinical analysis of vocal pathology.