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Glottal Adduction and Subglottal Pressure in Singing
Christian T Herbst1, Markus Hess2, Frank Müller2
1Voice Research Lab, Department of Biophysics, Faculty of Science, Palacký University Olomouc, Olomouc, Czech Republic; Laboratory of Bio-Acoustics, Department of Cognitive Biology, University of Vienna, Wien, Austria.
Summary
Trained singers can independently control vocal loudness and glottal configuration. This study explored how subglottal pressure relates to airflow and voice properties during independent vocal parameter variation.
Area of Science:
- Vocal acoustics and voice production science.
Background:
- Independent variation of vocal loudness and glottal configuration is reportedly absent in untrained speech.
- Understanding these parameters is crucial for voice pedagogy and therapy.
Purpose of the Study:
- To investigate independent variation of vocal loudness and glottal configuration in trained singers.
- To examine the relationship between subglottal pressure, airflow, voice source properties, and sound level.
Main Methods:
- A trained baritone produced sustained phonations varying register, phonation type, or loudness.
- Simultaneous videokymography, electroglottography, airflow, voice source, and subglottal pressure data were recorded.
- Analysis focused on changes in glottal flow, voice source parameters, and sound pressure.
Main Results:
- Register shifts (chest vs. falsetto) and phonation type changes altered airflow and voice source properties.
- Increased vocal loudness correlated with increased subglottal pressure, airflow, and sound pressure.
- Varying register or phonation type showed an inverse relationship between subglottal pressure and airflow (varying glottal resistance).
Conclusions:
- Trained singers demonstrate independent control of vocal loudness and glottal configuration.
- This independent control is achieved through modulation of subglottal pressure and glottal flow resistance.
- Mastering these independent controls is a key objective for vocal training and voice therapy.
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