A Subharmonic Vibratory Pattern in Normal Vocal Folds 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 ... Research Article
Research Article  |   February 01, 1996
A Subharmonic Vibratory Pattern in Normal Vocal Folds
 
Author Affiliations & Notes
  • Jan G. Švec
    Department of Experimental Physics Palacký University Olomouc, the Czech Republic
  • Harm K. Schutte
    Voice Research Lab Department of Medical Physiology University of Groningen the Netherlands
  • Donald G. Miller
    Voice Research Lab Department of Medical Physiology University of Groningen the Netherlands
  • Contact author: Jan G. Švec, MSc, Department of Experimental Physics, Palacký University, tř. Svobody 26, 771 46 Olomouc, the Czech Republic. E-mail: svec@risc.upol.cz
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   February 01, 1996
A Subharmonic Vibratory Pattern in Normal Vocal Folds
Journal of Speech, Language, and Hearing Research, February 1996, Vol. 39, 135-143. doi:10.1044/jshr.3901.135
History: Received December 8, 1994 , Accepted August 18, 1995
 
Journal of Speech, Language, and Hearing Research, February 1996, Vol. 39, 135-143. doi:10.1044/jshr.3901.135
History: Received December 8, 1994; Accepted August 18, 1995

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.

Acknowledgments
Jan Švec is on stay in the Voice Research Lab in Groningen. In 1993 this stay was enabled by grants from Jan Patočka Foundation, Hlávka Foundation, and by a loan from Civic Forum Foundation. In 1994 his stay was supported by a scholarship in the framework of Tempus Joint European Programme JEP 1941, in 1995 by an allowance from the Czech Literary Fund. The authors wish to express thanks to Vakgroep Spraak en Taal of the University of Nijmegen for providing the photoglottograph, and they appreciate the assistance of coworkers from the Audiovisual and Electronics section of the ENT clinic at University of Groningen. Special thanks are expressed to Jan van Dijk for his work on the electronic divider, Frits Leemhuis for his help with processing the videoframes, and photographer Meindert Goslihga for his work on the figures.
Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access