Phonation onset: Vocal fold modeling and high-speed glottography
作者:
Patrick Mergell,
Hanspeter Herzel,
Thomas Wittenberg,
Monika Tigges,
Ulrich Eysholdt,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1998)
卷期:
Volume 104,
issue 1
页码: 464-470
ISSN:0001-4966
年代: 1998
DOI:10.1121/1.423250
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Phonation onset is discussed in the framework of dynamical systems as a Hopf bifurcation, i.e., as a transition from damped to sustained vocal fold oscillations due to changes of parameters defining the underlying laryngeal configuration (e.g., adduction, subglottal pressure, muscular activity). An analytic envelope curve of the oscillation onset is deduced by analyzing the Hopf bifurcation in mathematical models of the vocal folds. It is governed by a single time constant which can be identified with the physiological parameterphonation onset time. This parameter reflects the laryngeal state prior to phonation and can be used as a quantitative classification criterion in order to assess the phonation onset in clinical diagnosis. The extraction of the phonation onset time from simulated time series using a simplified two-mass model and from digital high-speed videos is described in detail. It shows a good agreement between theory and measurement.
点击下载:
PDF
(313KB)
返 回