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Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
Published on: November 25, 2017
On pressure-frequency relations in the excised larynx.
Fariborz Alipour1, Ronald C Scherer
1Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, USA. alipour@blue.weeg.uiowa.edu
The Journal of the Acoustical Society of America
|October 2, 2007
Summary
This study explored how subglottal pressure (P(s)) affects voice pitch (F(0)) in excised canine larynges. Findings reveal a nonlinear relationship influenced by laryngeal tension, crucial for speech and singing.
Area of Science:
- Laryngeal biomechanics
- Acoustic phonetics
Background:
- Understanding voice production requires knowledge of laryngeal dynamics.
- Subglottal pressure (P(s)) and fundamental frequency (F(0)) are key parameters in phonation.
Purpose of the Study:
- To investigate the relationship between subglottal pressure (P(s)) and fundamental frequency (F(0)) in excised larynx models.
- To determine the rate of change of fundamental frequency with pressure (dFdP).
Main Methods:
- Excised canine larynges were mounted on a tapered tube for airflow.
- Glottal adduction was simulated using probes or sutures.
- Pressure-flow sweep experiments were conducted to measure P(s) and F(0).
Main Results:
- The pressure-frequency relationship was found to be nonlinear.
- This relationship was significantly influenced by laryngeal adduction and elongation.
- Average dFdP values were 2.9+/-0.7 Hzcm H(2)O (lower mode) and 5.3+/-0.5 Hzcm H(2)O (higher mode) for adduction, and 8.2+/-4.4 Hzcm H(2)O for elongation.
Conclusions:
- Laryngeal adduction and elongation play a critical role in modulating the P(s)-F(0) relationship.
- These findings have implications for understanding voice control in speech and singing.
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