Department of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Medical School, Bohlenplatz, Erlangen, Germany.
J Voice. 2012 May;26(3):285-92. doi: 10.1016/j.jvoice.2011.04.009. Epub 2011 Jun 25.
For the analysis of vocal fold dynamics, sub- and supraglottal influences must be taken into account, as recent studies have shown. In this work, we analyze the influence of changes in the epilaryngeal area on vocal fold dynamics. We investigate two excised female larynges in a hemilarynx setup combined with a synthetic vocal tract consisting of hard plastic and simulating the vowel /a/. Eigenmodes, amplitudes, and velocities of the oscillations, the subglottal pressures (P(sub)), and sound pressure levels (SPLs) of the generated signal are investigated as a function of three distinctive epilaryngeal areas (28.4 mm(2), 71.0 mm(2), and 205.9 mm(2)). The results showed that the SPL is independent of the epilarynx cross section and exhibits a nonlinear relation to the insufflated airflow. The P(sub) decreased with an increase in the epilaryngeal area and displayed linear relations to the airflow. The principal eigenfunctions (EEFs) from the vocal fold dynamics exhibited lateral movement for the first EEF and rotational motion for the second EEF. In total, the first two EEFs covered a minimum of 60% of the energy, with an average of more than 50% for the first EEF. Correlations to the epilarynx areas were not found. Maximal values for amplitudes (up to 2.5 mm) and velocities (up to 1.57 mm/ms) changed with varying epilaryngeal area but did not show consistent behavior for both larynges. We conclude that the size of the epilaryngeal area has significant influence on vocal fold dynamics but does not significantly affect the resultant SPL.
由于最近的研究表明，在分析声带动力学时，必须考虑到亚声门和声声门上的影响。在这项工作中，我们分析了会厌区域变化对声带动力学的影响。我们在半喉设置中研究了两个切除的女性喉，该设置与由硬塑料组成的合成声道结合，模拟了元音 /a/。我们研究了作为三个不同的会厌区域（28.4mm²、71.0mm²和 205.9mm²）函数的本征模态、振幅和振动速度、声门下压力（P(sub)）和生成信号的声压级（SPL）。结果表明，SPL 与会厌截面积无关，与注入气流呈非线性关系。P(sub)随着会厌区域的增加而减小，并与气流呈线性关系。声带动力学的主本征函数（EEFs）表现出第一 EEF 的侧向运动和第二 EEF 的旋转运动。总的来说，前两个 EEF 至少覆盖了 60%的能量，第一 EEF 的平均覆盖率超过 50%。没有发现与会厌区域的相关性。振幅（高达 2.5mm）和速度（高达 1.57mm/ms）的最大值随会厌区域的变化而变化，但两个喉都没有表现出一致的行为。我们得出的结论是，会厌区域的大小对声带动力学有显著影响，但对产生的 SPL 没有显著影响。
