Nonlinear dynamics of phonations in excised larynx experiments
Nonlinear dynamics of phonations in excised larynx experiments
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DOI：
10.1121/1.1610462
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发表时间：
2003-10-01
影响因子：
2.4
通讯作者：
Ford, CN
中科院分区：
文献类型：
--
作者：
Jiang, JJ;Zhang, Y;Ford, CN
应用相关维数和李亚普诺夫指数等非线性动态方法定量分析了切除喉实验中的发声。不规则发声的典型特征是非周期波形和宽带频谱。不规则发音的有限相关维数和正李雅普诺夫指数证明了切除喉发音中存在混沌。此外，使用相关维数、最大李雅普诺夫指数、抖动、闪烁和峰值突出比来统计区分不规则发音和正常发音。相关维数和最大Lyapunov指数表明不规则发音与正常发音之间存在显著差异；然而，抖动、闪烁和峰值突出比并没有显示出如此显著的差异，因此不适合区分不规则发音和正常发音。这些发现可能有助于研究人员了解粗略的发音，并开发有临床价值的语音疾病诊断方法。(C) 2003年美国声学学会。
Nonlinear dynamic methods including correlation dimension and Lyapunov exponents are applied to quantitatively analyze phonations in excised larynx experiments. Irregular phonations are typically characterized by aperiodic waveforms and broadband spectra. Finite correlation dimensions and positive Lyapunov exponents of irregular phonations demonstrate the existence of chaos in excised larynx phonations. Furthermore, the correlation dimension, maximal Lyapunov exponent, jitter, shimmer, and peak prominence ratio are used to statistically distinguish irregular phonations from normal phonations. The correlation dimension and maximal Lyapunov exponent indicate a significant difference between irregular and normal phonations; however, jitter, shimmer, and peak prominence ratio do not reveal such a significant difference and thus are unsuitable to differentiate between irregular phonations and normal phonations. These findings might potentially assist investigators in understanding rough phonations and developing clinically valuable methodologies for the diagnosis of voice disorders. (C) 2003 Acoustical Society of America.