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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication

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Nonlinear source-filter coupling in phonation: theory.

¹Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, USA. ingo-titze@uiowa.edu

The Journal of the Acoustical Society of America

|June 6, 2008

Summary

This summary is machine-generated.

This study introduces a new theory of voice production, explaining how vocal fold vibration interacts with the vocal tract. It highlights how vocal tract reactance influences vocal fold dynamics and stable sound production.

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Area of Science:

Acoustics
Bioacoustics
Speech Science

Background:

The traditional linear source-filter theory of voice production has limitations in explaining complex vocal fold dynamics.
Acoustic loading from the vocal tract significantly influences phonation, but its precise role is not fully understood.

Purpose of the Study:

To develop a new theory of interaction between the sound source (phonation) and the vocal tract filter.
To investigate how the laryngeal vestibule (epilarynx tube) affects vocal fold vibration and sound spectrum.

Main Methods:

Development of a theoretical model for source-filter interaction in voice production.
Analysis of acoustic reactance in the subglottal and supraglottal vocal tract.
Examination of vocal fold vibration dynamics under acoustic loading.

Main Results:

The cross-sectional area of the laryngeal vestibule modulates supraglottal inertive reactance, enhancing vocal fold driving pressures and glottal flow.
Harmonics are stabilized by favorable reactance regions, not by tuning to vocal tract resonances, preventing instability.
The developed theory addresses inconsistencies in glottal flow spectrum and predicts bifurcations in vocal fold dynamics.

Conclusions:

The interaction between the phonatory source and vocal tract filter is crucial for voice production.
Vocal tract reactance plays a key role in stabilizing vocal fold vibration and shaping the harmonic spectrum.
This new theory offers a more comprehensive understanding of voice production than traditional linear models.