Effect of level difference between left and right vocal folds on phonation: Physical experiment and theoretical study
Effect of level difference between left and right vocal folds on phonation: Physical experiment and theoretical study
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DOI：
10.1121/1.4996105
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发表时间：
2017-08-01
影响因子：
2.4
通讯作者：
Shimamura, Ryo
中科院分区：
文献类型：
--
作者：
Tokuda, Isao T.;Shimamura, Ryo
作为产生左右声带不对称的另一个因素，本研究着重于水平差，即双侧声带上表面在上下方向上的距离。利用声带物理模型研究声级差对发声阈值压力的影响。声道模型也附在声带模型上。对于两种不同的模型，实验表明，发声阈值压力随着水平差的扩大而增大。基于声带振动的小幅度近似，推导了发声阈值压力的理论公式。这一理论与实验相吻合，特别是在左右声带的相位差不大的情况下。在此基础上，采用水平差分方法对非对称双质量模型进行了数值模拟，验证了实验和理论的正确性。初步结论是，声级差对发声有潜在的影响，特别是对于声带垂直差异扩大的患者，这可能是嗓音障碍的诊断因素。(C)2017年美国声学学会。
As an alternative factor to produce asymmetry between left and right vocal folds, the present study focuses on level difference, which is defined as the distance between the upper surfaces of the bilateral vocal folds in the inferior-superior direction. Physical models of the vocal folds were utilized to study the effect of the level difference on the phonation threshold pressure. A vocal tract model was also attached to the vocal fold model. For two types of different models, experiments revealed that the phonation threshold pressure tended to increase as the level difference was extended. Based upon a small amplitude approximation of the vocal fold oscillations, a theoretical formula was derived for the phonation threshold pressure. This theory agrees with the experiments, especially when the phase difference between the left and right vocal folds is not extensive. Furthermore, an asymmetric two-mass model was simulated with a level difference to validate the experiments as well as the theory. The primary conclusion is that the level difference has a potential effect on voice production especially for patients with an extended level of vertical difference in the vocal folds, which might be taken into account for the diagnosis of voice disorders. (C) 2017 Acoustical Society of America.