Nonlinear source-filter coupling in phonation: Vocal exercises
Nonlinear source-filter coupling in phonation: Vocal exercises
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DOI：
10.1121/1.2832339
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发表时间：
2008-04-01
影响因子：
2.4
通讯作者：
Popolo, Peter
中科院分区：
文献类型：
--
作者：
Titze, Ingo;Riede, Tobias;Popolo, Peter
非线性源-滤波器耦合已经在计算机模拟、切除喉实验和物理模型中得到证实，但在自然人类发声中并没有一致和明确的方式。18名受试者（9名成年男性和9名成年女性）进行了三次声乐练习，代表了各种基频和共振峰下滑的组合。本研究的目标是查明由于非线性源-道耦合引起的源不稳定性的比例。有人假设，声带振动是最不稳定时，F-0交叉F-1，其中的声负荷变化显着。一份配套文件提供了理论基础。源-滤波器相互作用的预期表现是突然的频率跳跃、次谐波产生或与F-0-F-1交叉一致的混乱声带振动。结果表明，在F0-F1交叉的情况下，分叉现象更容易发生，这表明非线性源-滤波器耦合是导致源不稳定性的部分原因。此外，还观察到男性受试者在具有F-0-F-1交叉的发声中表现出更多的分叉，这可能是因为在正常的言语中，他们不太可能像女性那样遇到这些交叉，因此在抑制不必要的不稳定性方面的实践较少。(C)2008年，美国声学学会。
Nonlinear source-filter coupling has been demonstrated in computer simulations, in excised larynx experiments, and in physical models, but not in a consistent and unequivocal way in natural human phonations. Eighteen subjects (nine adult males and nine adult females) performed three vocal exercises that represented a combination of various fundamental frequency and formant glides. The C Goal of this study was to pinpoint the proportion of source instabilities that are due to nonlinear source-tract coupling. It was hypothesized that vocal fold vibration is maximally destabilized when F-0 crosses F-1, where the acoustic load changes dramatically. A companion paper provides the theoretical underpinnings. Expected manifestations of a source-filter interaction were sudden frequency jumps, subharmonic generation, or chaotic vocal fold vibrations that coincide with F-0-F-1 crossovers. Results indicated that the bifurcations occur more often in phonations with F-0-F-1 crossovers, suggesting that nonlinear source-filter coupling is partly responsible for source instabilities. Furthermore it was observed that male subjects show more bifurcations in phonations with F-0-F-1 crossovers, presumably because in normal speech they are less likely to encounter these crossovers as much as females and hence have less practice in suppressing unwanted instabilities. (C) 2008 Acoustical Society of America.