Mathematical models of glottal area and vocal fold contact area

1982 ◽  
Vol 72 (S1) ◽  
pp. S48-S48 ◽  
Author(s):  
Ingo R. Titze
Keyword(s):  
Mathematical Models ◽  
Contact Area ◽  
Vocal Fold

Monitoring Vocal Fold Abduction through Vocal Fold Contact Area

1988 ◽  
Vol 31 (3) ◽  
pp. 338-351 ◽  
Author(s):  
Martin Rothenberg ◽  
James J. Mahshie
Keyword(s):  
Contact Area ◽  
Time Variation ◽  
Vocal Fold ◽  
Thyroid Cartilage ◽  
Electrical Conductance ◽  
Vocal Folds ◽  
Linear Phase ◽  
Voice Production ◽  
Voiced Speech ◽  
High Pass

A number of commercial devices for measuring the transverse electrical conductance of the thyroid cartilage produce waveforms that can be useful for monitoring movements within the larynx during voice production, especially movements that are closely related to the time-variation of the contact between the vocal folds as they vibrate. This paper compares the various approaches that can be used to apply such a device, usually referred to as an electroglottograph, to the problem of monitoring the time-variation of vocal fold abduction and adduction during voiced speech. One method, in which a measure of relative vocal fold abduction is derived from the duty cycle of the linear-phase high pass filtered electroglottograph waveform, is developed in detail.

scholarly journals A model for vocal fold vibratory motion, contact area, and the electroglottogram

1986 ◽  
Vol 80 (5) ◽  
pp. 1309-1320 ◽  
Author(s):  
D. G. Childers ◽  
D. M. Hicks ◽  
G. P. Moore ◽  
Y. A. Alsaka
Keyword(s):  
Contact Area ◽  
Vocal Fold ◽  
Vibratory Motion

scholarly journals Relationship Between the Electroglottographic Signal and Vocal Fold Contact Area

2016 ◽  
Vol 30 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Vít Hampala ◽  
Maxime Garcia ◽  
Jan G. Švec ◽  
Ronald C. Scherer ◽  
Christian T. Herbst
Keyword(s):  
Contact Area ◽  
Vocal Fold

Measuring contact area in synthetic vocal fold replicas using electrical resistance

2016 ◽  
Vol 139 (4) ◽  
pp. 2221-2221
Author(s):  
Kyle L. Syndergaard ◽  
Stephen Warner ◽  
Shelby Dushku ◽  
Scott L. Thomson
Keyword(s):  
Contact Area ◽  
Electrical Resistance ◽  
Vocal Fold

Fundamental Frequency in Excised Human Larynges after Anterior Glottic Web Formation of Various Extents

2018 ◽  
Vol 160 (4) ◽  
pp. 672-678
Author(s):  
Thais Gonçalves Pinheiro ◽  
Camila Cristina Ishikawa ◽  
Rui Imamura ◽  
Ronaldo Frizzarini ◽  
Arlindo Neto Montagnoli ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Fundamental Frequency ◽  
Vocal Fold ◽  
High Speed ◽  
Tertiary Care ◽  
Vocal Folds ◽  
Progressive Increase ◽  
Care Hospital ◽  
The Difference ◽  
Anterior Glottic Web

Objective To determine the effect of vocal fold anterior web formation on fundamental frequency with a cadaveric excised larynx model. Study Design Experimental study with excised human larynges. Setting Academic tertiary care hospital. Subjects and Methods Sixteen freshly excised human larynges were evaluated with high-speed videoendoscopy and digital kymography during artificially produced vibration. Each larynx was assessed in 4 conditions: preoperative controls and after 25%, 33%, and 50% decreases in the vibratory portion of the vocal folds. The following parameters were evaluated: fundamental frequency, periodicity, vocal fold vibration amplitude, phase symmetry, and glottic closure. Results The mean fundamental frequencies were 208.87, 250.20, 292.37, and 342.67 Hz for preoperative controls and 25%, 33%, and 50% reductions in vibratory length of the vocal folds, respectively. Fundamental frequency increased with each increase in anterior glottic web extent, and the difference among the groups was statistically significant in absolute values in hertz and in semitone elevation. The mathematical models for estimating postoperative fundamental frequency had a statistically significant coefficient. The vibration of the vocal folds remained periodic in all larynges before and after the procedures. Conclusion There was a significant and progressive increase in the fundamental frequency with each enlargement of anterior glottic web. Based on the control frequency, mathematical models could estimate the value of the fundamental frequency after the procedure.

scholarly journals Vocal fold contact area

1987 ◽  
Vol 81 (S1) ◽  
pp. S37-S37 ◽  
Author(s):  
Ingo R. Titze ◽  
David Druker ◽  
Paul Durham
Keyword(s):  
Contact Area ◽  
Vocal Fold

Laryngograph as a Measure of Vocal Fold Contact Area

1984 ◽  
Vol 27 (2) ◽  
pp. 178-182 ◽  
Author(s):  
H. R. Gilbert ◽  
Charles R. Potter ◽  
Ronald Hoodin
Keyword(s):  
High Resistance ◽  
Contact Area ◽  
Vocal Fold ◽  
Stop Consonant ◽  
Vocal Folds ◽  
Pressure Waveform ◽  
Additional Information ◽  
Subglottal Pressure ◽  
Vocal Effort

The present investigation sought to provide additional information concerning the laryngograph as a means to study vocal fold contact area. Subglottal pressures were sensed simultaneously with the laryngographic signal while the speaker produced a variety of speech tasks. The onset and cessation of the subglottal pressure waveform was studied relative to the laryngographic and speech waveforms. Differences were noted for voiced-voiceless contrasts for bilabial stop consonant production and vocal effort changes during the three vowels studied. Also a high-resistance polymer strip was placed between the vocal folds and gradually removed while simultaneous laryngographic recordings were obtained during sustained productions of the vowel/Δ/. An increase in the amplitude of the laryngographie waveform upon withdrawal of the polymer strip strongly supported the concept that the laryngographic signal is generated directly by the change in conductance due to alterations in the area of vocal fold contact.

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