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Journal of Speech and Hearing Research Vol.39 135-143 February 1996.
© American Speech-Language-Hearing Association
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A Subharmonic Vibratory Pattern in Normal Vocal Folds

Jan G. Svec 1
Harm K. Schutte 2

Donald G. Miller 2
1 Department of Experimental Physics Palackyacute University Olomouc, the Czech Republic
2 Voice Research Lab Department of Medical Physiology University of Groningen the Netherlands

svec{at}risc.upol.cz

This study observes in detail an F0/2 (sounding an octave below an original tone) subharmonic vibratory pattern produced in a normal larynx. Simultaneous electroglottographic and photoglottographic measurements reveal two different open phases within a subharmonic cycle—the first shorter with a simple shape, the second longer with a shape containing a "ripple." Such parameters as the large open quotient (ca. 0.8) and the high airflow values (ca. 1000 cm3/s) distinguish this phonation from the vocal fry (pulse) register. Using an electronic divider to track the subharmonic frequency, a method has been developed to observe the subharmonic vibration of the vocal folds stroboscopically. The stroboscopic visualization reveals an unusual mucosal movement during the "ripple," characterized by an opening movement of the upper margins, which interrupts the closing movement of the vocal folds. An explanation is offered that this vibratory pattern arises as a consequence of detuning of the usually identical frequencies of the dominant modes of the vocal folds, with 3:2 entrainment replacing the normal 1:1 pattern.

KEY WORDS: vocal folds, stroboscopy, vibrational modes, bifurcation, entrainment

Submitted on December 8, 1994
Accepted on August 18, 1995


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