Mechanism of and threshold biomechanical conditions for falsetto voice onset.
Mechanism of and threshold biomechanical conditions for falsetto voice onset.
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DOI：
10.1371/journal.pone.0017503
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发表时间：
2011-03-07
期刊：
影响因子：
3.7
通讯作者：
Deguchi S
中科院分区：
文献类型：
--
作者：
Deguchi S
声音的声源是由声带的自激振荡产生的。在模态发声中，声带闭合后跨声门压的急剧增加是发展自激的驱动力。另一种类型的声带振荡与不太明显的声门关闭观察假声产生已占粘膜波理论。经典理论假设声流为准定常流，并根据伯努利效应推导出声带在波动运动下所受的驱动力。然而，在假声产生过程中并不总是观察到波动。更重要的是，将准稳态假设应用于基频为几百赫兹的假声是没有实验支持的。这些考虑表明，假声启动的机制可能是本质上不同于粘膜波理论所解释的。在本文中，提出了一种替代机制，解释了如何自激想起假声可以产生独立的声门关闭和波状运动。这种新的解释是通过分析程序得出的，只采用一般的非定常运动方程的流动和固体。分析表明，由快速壁运动引起的对流加速作为负阻尼力，导致声带的自激。临界声门下压和体积流量表示为声带生物力学特性、几何形状和嗓音基频的函数。分析得出的条件是定性和定量的合理性，鉴于所报告的测量数据的阈值所需的假声的声音开始。了解嗓音的发生机制和明确的阈值数学描述将有助于嗓音疾病的诊断和治疗以及人工声带的开发。
The sound source of a voice is produced by the self-excited oscillation of the vocal folds. In modal voice production, a drastic increase in transglottal pressure after vocal fold closure works as a driving force that develops self-excitation. Another type of vocal fold oscillation with less pronounced glottal closure observed in falsetto voice production has been accounted for by the mucosal wave theory. The classical theory assumes a quasi-steady flow, and the expected driving force onto the vocal folds under wavelike motion is derived from the Bernoulli effect. However, wavelike motion is not always observed during falsetto voice production. More importantly, the application of the quasi-steady assumption to a falsetto voice with a fundamental frequency of several hundred hertz is unsupported by experiments. These considerations suggested that the mechanism of falsetto voice onset may be essentially different from that explained by the mucosal wave theory. In this paper, an alternative mechanism is submitted that explains how self-excitation reminiscent of the falsetto voice could be produced independent of the glottal closure and wavelike motion. This new explanation is derived through analytical procedures by employing only general unsteady equations of motion for flow and solids. The analysis demonstrated that a convective acceleration of a flow induced by rapid wall movement functions as a negative damping force, leading to the self-excitation of the vocal folds. The critical subglottal pressure and volume flow are expressed as functions of vocal fold biomechanical properties, geometry, and voice fundamental frequency. The analytically derived conditions are qualitatively and quantitatively reasonable in view of reported measurement data of the thresholds required for falsetto voice onset. Understanding of the voice onset mechanism and the explicit mathematical descriptions of thresholds would be beneficial for the diagnosis and treatment of voice diseases and the development of artificial vocal folds.
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影响因子：
3.7
作者：
CANCELLI, C;PEDLEY, TJ
通讯作者：
PEDLEY, TJ
DOI：
10.1044/1092-4388(2008/07-0212
发表时间：
2009-04-01
影响因子：
2.6
作者：
Alipour, Fariborz;Finnegan, Eileen M.;Scherer, Ronald C.
通讯作者：
Scherer, Ronald C.
DOI：
10.1159/000263771
发表时间：
1974-01-01
期刊：
FOLIA PHONIATRICA
影响因子：
--
作者：
HIRANO, M
通讯作者：
HIRANO, M
影响因子：
2.3
作者：
Bertram, Christopher D.
通讯作者：
Bertram, Christopher D.
影响因子：
3.3
作者：
Hunter, Eric J.;Titze, Ingo R.
通讯作者：
Titze, Ingo R.