OBSERVATION OF PERTURBATIONS IN A LUMPED-ELEMENT MODEL OF THE VOCAL FOLDS WITH APPLICATION TO SOME PATHOLOGICAL CASES

被引:62
|
作者
WONG, D [1 ]
ITO, MR [1 ]
COX, NB [1 ]
TITZE, IR [1 ]
机构
[1] UNIV IOWA,DEPT SPEECH PATHOL & AUDIOL,VOICE ACOUST & BIOMECH LAB,IOWA CITY,IA 52242
来源
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 1991年 / 89卷 / 01期
关键词
D O I
10.1121/1.400472
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this paper a mass-spring model is developed that is a hybrid of the two-mass and the longitudinal string models, proposed by Ishizaka and Flanagan [Bell Sys. Tech. J. 51, 1233-1268 (1972)] and Titze [Phonetica 28, 129-170 (1973)], respectively. The model is used to simulate the vibratory motion of both the normal and asymmetric vocal folds. Mouth-output pressure, lateral tissue displacement, phase plots, and energy diagrams are presented to demonstrate the interaction between vocal fold tissue and the aerodynamic flow between the folds. The results of the study suggest that this interaction is necessary for sustained large amplitude oscillation because the flow supplies the energy lost by the tissue damping. Tissue mass and stiffness were varied locally or uniformly. Decreased stress in the longitudinal string tension produced subharmonic and chaotic vibrations in the displacement, velocity and acceleration phase diagrams. Similar vibratory characteristics also appeared in pathological speech data analyzed using time domain jitter and shimmer measures and a harmonics-to-noise ratio metric. The subharmonics create an effect that has been perceptually described as diplophonia.
引用
收藏
页码:383 / 394
页数:12
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