Shiotani A, Fukuda H, Kawaida M, Kanzaki J
Department of Otolaryngology, School of Medicine, Keio University, Tokyo, Japan.
Eur Arch Otorhinolaryngol. 1996;253(6):356-63. doi: 10.1007/BF00178292.
In order to establish precise vibratory patterns and their clinical implication for phonation, the mode of vibration of the vocal folds around the time of register transition in excised canine larynges was analyzed multi-directionally according to various acoustic parameters. Phonation was simulated by artificially tensing the cricothyroid muscles. Vibration of the vocal folds around the time of register transition was filmed from above using ultra-high-speed cinematography and in a frontal plane using X-ray stroboscopy. Acoustic parameters included subglottic pressure, pitch, intensity and tension and were recorded simultaneously during register transition. The fundamental vibration patterns observed during vocal phonation were the same as that involved in chest voice phonation in excised canine larynges, with respect to the traveling wave of the vocal fold vibration. Changes in the physical properties of the vocal folds were considered to occur at register transition. These changes were probably strongly dependent upon changes in the structure of the lamina propria. Head voice phonation requires adaptability of the lamina propria and is less efficient than chest voice phonation. Hence, head voice phonation would be one method for assessing the condition of the vocal folds.
为了确定精确的振动模式及其在发声中的临床意义，根据各种声学参数，对切除的犬喉在声区转换时声带的振动模式进行了多方向分析。通过人工拉伸环甲肌来模拟发声。使用超高速电影摄影从上方拍摄声区转换时声带的振动，并使用X射线频闪喉镜在额平面拍摄。声学参数包括声门下压力、音高、强度和张力，并在声区转换期间同时记录。就声带振动的行波而言，在发声时观察到的基本振动模式与切除的犬喉胸声发声时的模式相同。声区转换时声带的物理特性发生了变化。这些变化可能强烈依赖于固有层结构的变化。头声发声需要固有层的适应性，并且比胸声发声效率低。因此，头声发声将是评估声带状况的一种方法。
