Faculty of Mechanical Engineering, Department of Mechanics, Biomechanics and Mechatronics, Czech Technical University in Prague, Karlovo náměstí 13, 121 35 Prague 2, Czech Republic.
J Acoust Soc Am. 2011 Jan;129(1):310-5. doi: 10.1121/1.3506347.
Phonation into a glass tube is a voice training and therapy method that leads to beneficial effects in voice production. It has not been known, however, what changes occur in the vocal tract during and after the phonation into a tube. This pilot study examined the vocal tract shape in a female subject before, during, and after phonation into a tube using computer tomography (CT). Three-dimensional finite-element models (FEMs) of the vocal tract were derived from the CT images and used to study changes in vocal tract input impedance. When phonating on vowel [a:] the data showed tightened velopharyngeal closure and enlarged cross-sectional areas of the oropharyngeal and oral cavities during and after the tube-phonation. FEM calculations revealed an increased input inertance of the vocal tract and an increased acoustic energy radiated out of the vocal tract after the tube-phonation. The results indicate that the phonation into a tube causes changes in the vocal tract which remain also when the tube is removed. These effects may help improving voice production in patients and voice professionals.
向玻璃管发声是一种嗓音训练和治疗方法，可对发声产生有益的影响。然而，目前尚不清楚在向管中发声期间和之后，声道会发生什么变化。本初步研究使用计算机断层扫描（CT）检查了一名女性受试者在向管中发声之前、期间和之后的声道形状。从 CT 图像中得出了声道的三维有限元模型（FEM），并用于研究声道输入阻抗的变化。在发元音[a:]时，数据显示在管发声期间和之后，软腭闭合更紧，咽腔和口腔的横截面积增大。FEM 计算显示，管发声后声道的输入惯性增加，声道辐射的声能增加。结果表明，向管中发声会导致声道发生变化，即使管被移除后这些变化仍然存在。这些效果可能有助于改善患者和语音专业人士的发声。
