Effects of Transglottal Pressure on Fundamental Frequency of Phonation: Study with a Rubber Model

Abstract

The fundamental frequency of phonation (F0) change per unit change in transglottal pressure (dF/dP) was studied at different extension lengths and masses of the vibrating part of a rubber model. The dF/dP was decreased when the vibrating part was extended, and also when the mass of the vibrating part was increased. In the former, the F0 was increased, and in the latter, the F0 was decreased. In humans, we have noticed that when the F0 was increased, the dF/dP first decreased and then increased, taking a V-shaped curve as a function of the F0. The present study reveals the mechanism underlying the V-shaped curve observed in humans.

Computer-Aided Technique for Automatic Determination of the Relationship between Transglottal Pressure Change and Voice Fundamental Frequency

“…4 In vivo measurement of the vocal fold mechanical properties usually requires anesthesia to an adequate site in the laryngopharynx. 4,5 To minimize the burden of anesthesia, Kitajima and his colleagues [6][7][8][9] explored development of a noncontact measurement using a mouthpiece. Their group investigated, as a measure of vocal fold stiffness, the ratio of change of vocal fundamental frequency (F0) with respect to transglottal pressure.…”

Effect of Artificially Lengthened Vocal Tract on Vocal Fold Oscillation's Fundamental Frequency

“…We considered K to be a variable regulated by the intrinsic muscles. F 0 was calculated for Density of air 1.14 × 10 -3 g/cm 3 C Velocity of sound in air 3.5 × 10 4 m/s l S Length of the tract T S 35.5 cm l L Length of the tract T L 45.5 cm l 1 Length of the tract T 1 30 cm l 2 Length of the tract T 2 2.5 cm l 3 Length of the tract T 3 3.0 cm l 4 Length of the tract T 4 40 cm l 5 Length of the tract T 5 2.5 cm l 6 Length of the tract T 6 3.0 cm A s Area of the tract T S 4.9 cm 2 A L Area of the tract T L 4.9 cm 2 A 1 Area of the tract T 1 4.9 cm 2 A 2 Area of the tract T 2 1.0 cm 2 A 3 Area of the tract T 3 4.9 cm 2 A 4…”

“…For example, no clear relationship between elongation of the rubber section that simulates the vocal fold and a negative dF/dP value was seen, as occurs in adult men. 2 Kataoka and Kitajima 3 also measured dF/dP in three dogs, but they failed to find a negative dF/dP. In addition to the three accepted parameters that determine F 0 , length, stiffness, and subglottal pressure, we added one more item.…”

“…To calculate reactance, the vocal tract was assumed to be a combination of the simple cross-sectional area of Journal of Voice, Vol. 18, No 2,. 2004 …”

Relationship Between Transglottal Pressure and Fundamental Frequency of Phonation—Study Using a Rubber Model

“…Kataoka et al reproduced the V-shaped curve using the rubber model by elongating the model and reducing the internal volume. 3 However, although the V-shaped curve was successfully reproduced, the left half of the curve exhibited only a weak correlation between elongation of the vibrating part and dF/dP.…”