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Updated: May 10, 2026
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Published on: November 25, 2017
Subglottal pressure oscillations accompanying phonation.
Johan Sundberg1, Ronald Scherer, Markus Hess
1Department of Speech, Music, and Hearing, School of Computer Science and Communication, KTH Voice Research Centre, Stockholm, Sweden. pjohan@speech.kth.se
Summary
Investigating the subglottal system, this study measured subglottal pressure during speech. Findings reveal subglottal resonances are consistent across vowels and phonation types, impacting voice production.
Area of Science:
- Speech Science
- Acoustic Phonetics
- Voice Production
Background:
- Extensive research exists on vocal tract and voice source aerodynamics.
- Subglottal system investigations are less common but crucial for understanding voice production.
Purpose of the Study:
- To explore the subglottal system's role in voice production.
- To analyze the effects of vowels, phonation types, and vocal registers on subglottal pressure waveforms.
Main Methods:
- Direct measurement of subglottal pressure via tracheal puncture in a male adult.
- Simultaneous recording of oral airflow and audio signals.
- Analysis of subglottal pressure waveform, resonance frequencies, and spectral data.
Main Results:
- The maximum flow declination rate synchronized with the primary positive peak in the subglottal pressure waveform.
- The three lowest subglottal resonance frequencies (approx. 500, 1220, 2000 Hz) remained constant regardless of supraglottal variations and phonation type.
- Subglottal pressure waveforms were influenced by supraglottal formants, but radiated vowel spectra showed no clear impact from subglottal resonances.
Conclusions:
- Subglottal resonance frequencies are stable and largely independent of vocal tract configurations and phonation.
- While subglottal pressure is affected by the vocal tract, subglottal resonances do not significantly influence radiated vowel spectra.
- No clear relationship was found between fundamental frequency changes around register breaks and formants or subglottal resonance.
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