Schade G, Kirchhoff T, Hess M
Poliklinik für Hör-, Stimm- und Sprachheilkunde, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Deutschland.
Folia Phoniatr Logop. 2005 Jul-Aug;57(4):202-15. doi: 10.1159/000085188.
Clinical examinations with short-interval, color-filtered double-flash stroboscopy enable us to estimate the movements of the vocal fold edges during phonation. So-called 'displacement bands' show the degree of the vibratory amplitude in these images. Using the two-point light projection method the displacement bands can be measured with very high accuracy. A combination of these two methods was used for velocity measurements of the vocal fold movements within the phonatory cycle. The aim of the study was to explore the influence of change in sound pressure level (SPL) and fundamental frequency (F0) on the velocity of the horizontal amplitude of the vocal folds during phonation.
40 healthy volunteers (31 women, 9 men, average age 24.8 years) were examined. During the special videostroboscopy with short-interval, color-filtered double flashes laser spots were projected onto the vocal folds by an endoscopic two-point light projection device. The subjects had to change their SPL and F0 following a test protocol. During phonation they had to produce tones in low, middle and high chest voice as well as in falsetto register. Each subject was asked to do this in a soft, a modal, a loud and a very loud manner. Images of the phonatory cycle showing the vocal folds immediately before collision were measured separately at three different positions. About 15,000 single measurements were evaluated.
The measured velocity of the horizontal amplitude during the closing phase of the vocal folds in chest voice was 30-160 cm/s. An increase in SPL resulted in an increasing velocity of the displacement bands. A change in F0 did not lead to statistically relevant changes in the measured velocity.
A combination of short-interval, color-filtered double-flash stroboscopy and a two-point light projection method enables measurements of the velocity of vocal fold movements. The SPL is the important factor for the velocity change within the phonatory cycle. F0 seems not to covary with the velocity of the horizontal amplitude during the closing phase of the phonatory cycle.
短间隔、彩色滤光双闪频闪喉镜检查能够让我们在发声过程中评估声带边缘的运动。在这些图像中，所谓的“位移带”显示了振动幅度的大小。使用两点光投影法可以非常高精度地测量位移带。这两种方法相结合用于测量发声周期内声带运动的速度。本研究的目的是探讨声压级（SPL）和基频（F0）的变化对发声过程中声带水平振幅速度的影响。
对40名健康志愿者（31名女性，9名男性，平均年龄24.8岁）进行了检查。在特殊的短间隔、彩色滤光双闪频闪喉镜检查过程中，通过内镜两点光投影装置将激光点投射到声带上。受试者必须按照测试方案改变他们的SPL和F0。在发声过程中，他们必须用低、中、高胸声以及假声区发出音调。要求每个受试者以轻柔、正常、响亮和非常响亮的方式进行。分别在三个不同位置测量发声周期中声带即将碰撞前的图像。评估了约15000次单次测量。
胸声中声带闭合阶段水平振幅的测量速度为30 - 160厘米/秒。SPL的增加导致位移带速度增加。F0的变化并未导致测量速度出现统计学上的显著变化。
短间隔、彩色滤光双闪频闪喉镜检查和两点光投影法相结合能够测量声带运动的速度。SPL是发声周期内速度变化的重要因素。在发声周期的闭合阶段，F0似乎与水平振幅的速度没有协同变化。
