期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 129, 期 1, 页码 326-339出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.3514536
关键词
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资金
- NIH National Institute on Deafness and Other Communication Disorders [T32 DC00038, R01 DC007640]
- Institute of Laryngology and Voice Restoration
- National Science Foundation (NSF) [CBET-0828903]
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [T32DC000038, R01DC007640] Funding Source: NIH RePORTER
Different source-related factors can lead to vocal fold instabilities and bifurcations referred to as voice breaks. Nonlinear coupling in phonation suggests that changes in acoustic loading can also be responsible for this unstable behavior. However, no in vivo visualization of tissue motion during these acoustically induced instabilities has been reported. Simultaneous recordings of laryngeal high-speed videoendoscopy, acoustics, aerodynamics, electroglottography, and neck skin acceleration are obtained from a participant consistently exhibiting voice breaks during pitch glide maneuvers. Results suggest that acoustically induced and source-induced instabilities can be distinguished at the tissue level. Differences in vibratory patterns are described through kymography and phono-vibrography; measures of glottal area, open/speed quotient, and amplitude/phase asymmetry; and empirical orthogonal function decomposition. Acoustically induced tissue instabilities appear abruptly and exhibit irregular vocal fold motion after the bifurcation point, whereas source-induced ones show a smoother transition. These observations are also reflected in the acoustic and acceleration signals. Added aperiodicity is observed after the acoustically induced break, and harmonic changes appear prior to the bifurcation for the source-induced break. Both types of breaks appear to be subcritical bifurcations due to the presence of hysteresis and amplitude changes after the frequency jumps. These results are consistent with previous studies and the nonlinear source-filter coupling theory. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3514536]
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