Self-excitation Analyses Of Vocal Chord Under
Breathing Flow And Frequency Change By
Muscle Activation
Author(s)
T. Tsuta, T. Iwamoto, T. Shimizu & D. Egusa
Abstract
This paper presents some analyses and experiments on vocalizing mechanics in
the vocal chord due to the breathing flow, and their wide range of frequency
change by varying the interior muscle activations.
Three-dimensional dynamic responses of the hyperelastic and finite
deformation body of the vocal chord and the interior muscles have been analysed
at first and the exclusive FEM system has been developed. The eigen frequencies
and vibration characteristics of the vocal chord are analysed by varying the
activation level of the interior muscles.
The Helmholtz equation of the breathing flow under transient state has been
analysed to obtain the pressure pulsation characteristics behind the vocal chord
during vocalizing of the source voice. Combining both approaches stated above,
the mechanism of the self-exciting vibration of the vocal chord has been studied
in detail using the route-locus approach.
It is also found in the analysis and experiments that the frequency of the selfexciting
vibration can be widely varied with the activation level of the interior
muscle of the vocal chord, giving rise to a variety of frequency levels of the
source voice.
1 Introduction
It is important to clarify theoretically the human’s vocalizing mechanics in the
larynx-vocal tract system, in order to develop the artificial system for a
Keywords
Related Book
Other papers in this volume
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