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Related Experiment Videos

A subharmonic vibratory pattern in normal vocal folds

J G Svec1, H K Schutte, D G Miller

  • 1Department of Experimental Physics, Palacky University, Olomouc, Czech Republic. svec@risc.upol.cz

Journal of Speech and Hearing Research
|February 1, 1996
PubMed
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Researchers detailed a unique F0/2 subharmonic vibration in the larynx, distinct from vocal fry. This vocal fold pattern involves unusual mucosal wave motion and a 3:2 frequency entrainment.

Area of Science:

  • Laryngology
  • Acoustic phonetics
  • Vocal fold physiology

Background:

  • Subharmonic vibration in the human larynx is not well understood.
  • Distinguishing different phonation types is crucial for voice analysis.

Purpose of the Study:

  • To investigate the vibratory pattern of an F0/2 subharmonic in a normal larynx.
  • To characterize the laryngeal dynamics and airflow during this phonation.

Main Methods:

  • Simultaneous electroglottography and photoglottography were used.
  • An electronic divider tracked subharmonic frequency for stroboscopic observation.
  • High-speed visualization captured mucosal wave motion.

Main Results:

  • Two distinct open phases were identified within the subharmonic cycle: a short simple phase and a longer phase with a "ripple."

Related Experiment Videos

  • Phonation parameters (open quotient ~0.8, airflow ~1000 cm³/s) differentiated it from vocal fry.
  • Stroboscopic visualization showed upper margin opening interrupting vocal fold closure during the ripple.

    • Conclusions:

    • The F0/2 subharmonic pattern results from detuning of dominant vocal fold modes.
    • A 3:2 entrainment of vocal fold modes, rather than the typical 1:1, explains this vibration.
    • This provides new insights into complex vocal fold dynamics and phonation registers.