Vibratory Dynamics of Four Types of Excised Larynx Phonations
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- 作者：Lin Li&lowast ; ; Yu Zhang&dagger ; ; &Dagger ; ; yuzhang@xmu.edu.cn ; William Calawerts§ ; ; Jack J. Jiang§ ;
- 关键词：High-speed imaging ; Type 4 signal ; Correlation dimension ; Kolmogorov entropy
- 刊名：Journal of Voice
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：30
- 期：6
- 页码：649-655
- 全文大小：1525 K
- 卷排序：30
文摘
There are four types of signals that are typical representations of vocal fold vibratory patterns. Type 1 signals are nearly periodic, type 2 signals contain subharmonic properties, type 3 signals are chaotic, and type 4 signals are characterized as white noise. High-speed imaging allows detailed observation of these vocal fold vibratory patterns. Therefore, high-speed imaging can explore the vibratory mechanism behind each of the four types of signals.MethodsThe glottal area time series of the four types of vocal fold vibrations were calculated from high-speed images of 10 excised canine larynges. Nonlinear dynamic parameters of correlation dimension (D2) and Kolmogorov entropy (K2) were used to quantify the characteristics of the glottal areas and acoustical signals for each voice signal type.ResultsThe correlation dimension and Kolmogorov entropy of the glottal areas and acoustical signals for type 1, 2, and 3 voice signals were consistent with the results of previous studies. Interestingly, there was a difference between the glottal area and acoustical signals of type 4 voice signals (P < 0.001). Both the correlation dimension and Kolmogorov entropy of the type 4 glottal area were close to 0. In contrast, the type 4 acoustical signals had an infinite correlation dimension and a Kolmogorov entropy that was close to 1.ConclusionsTurbulence in the vocal tract creates high-frequency breathiness, causing noise in the acoustical signal of type 4 voice, proving that the acoustical signal does not represent the motion mechanism behind type 4 voice. The results of this study demonstrate that high-speed imaging can provide a more accurate representation of the type 4 vocal fold vibratory pattern, and a more effective method to explore the mechanism of type 4 signals.