THE PHYSICS OF SMALL-AMPLITUDE OSCILLATION OF THE VOCAL FOLDS
THE PHYSICS OF SMALL-AMPLITUDE OSCILLATION OF THE VOCAL FOLDS
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DOI：
10.1121/1.395910
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发表时间：
1988-04-01
影响因子：
2.4
通讯作者：
TITZE, IR
中科院分区：
文献类型：
--
作者：
TITZE, IR
声带振荡理论是在身体覆盖假设的基础上发展起来的。覆盖层由分布的表面层表示，该表面层可以传播粘膜表面波。面波位移和速度的线性化，以及进一步的小幅度近似，给出了振荡条件的闭合形式表达式。该理论预测，维持振荡所需的肺压，即振荡阈值压力，可以通过降低粘膜波速、拉近声带之间的距离和减小声门会聚角度来降低。计算中考虑了声道声负荷的影响。结果表明，声道惯性降低了振荡阈值压力，而声道阻力增大了振荡阈值压力。该疗法适用于假声和喘息嗓音，以及在没有声带碰撞的情况下发声或发声，与以往基于双质量模型和可折叠管的治疗方法相协调。
A theory of vocal fold oscillation is developed on the basis of the body-cover hypothesis. The cover is represented by a distributed surface layer that can propagate a mucosal surface wave. Linearization of the surface-wave displacement and velocity, and further small-amplitude approximations, yields closed-form expressions for conditions of oscillation. The theory predicts that the lung pressure required to sustain oscillation, i.e., the oscillation threshold pressure, is redced by reducing the mucosal wave velocity, by bringing the vocal folds closer together and by reducing the convergence angle in the glottis. The effect of vocal tract acoustic loading is included. It is shown that vocal tract inertance reduces the oscillation threshold pressure, whereas vocal tract resistance increases it. The treatment, which is applicable to falsetto and breathy voice, as well as onset or release of phonation in the absence of vocal fold collision, is harmonized with former treatments based on two-mass models and collapsible tubes.