Nonlinear source-filter coupling in phonation: Theory
Nonlinear source-filter coupling in phonation: Theory
复制标题
DOI：
10.1121/1.2832337
复制
发表时间：
2008-05-01
影响因子：
2.4
通讯作者：
Titze, Ingo R.
中科院分区：
文献类型：
--
作者：
Titze, Ingo R.
提出了发声声源与声道滤波器相互作用的理论。相互作用的程度是由喉前庭（咽管）的横截面积控制的，它提高了声道上声道的惯性电抗。声门下抗和声门上抗都能增强声带的驱动压力和声门流，从而提高声源处的能量水平。该理论预测，在音高或元音变化期间，当谐波通过共振峰时，振动模式可能会发生不稳定。与大多数乐器（如木管乐器和铜管乐器）不同，稳定的谐波源频谱不是通过将谐波调谐到声道共振而获得的，而是通过将谐波置于有利的电抗区域。这允许通过声门上的惯性电抗（以及较小程度的声门下的顺应电抗）正强化谐波，而不会有不稳定的风险。传统的线性源滤波器理论存在声门流谱不一致的问题，声门流谱受相互作用的影响。此外，线性理论不能预测由于声道声载荷引起的声带振动动力学行为的分岔。(c) 2008年美国声学学会。
A theory of interaction between the source of sound in phonation and the vocal tract filter is developed. The degree of interaction is controlled by the cross-sectional area of the laryngeal vestibule (epilarynx tube), which raises the inertive reactance of the supraglottal vocal tract. Both subglottal and supraglottal reactances can enhance the driving pressures of the vocal folds and the glottal flow, thereby increasing the energy level at the source. The theory predicts that instabilities in vibration modes may occur when harmonics pass through formants during pitch or vowel changes.. Unlike in most musical instruments (e.g., woodwinds and brasses), a stable harmonic source spectrum is not obtained by tuning harmonics to vocal tract resonances, but rather by placing harmonics into favorable reactance regions. This allows for positive reinforcement of the harmonics by supraglottal inertive reactance (and to a lesser degree by subglottal compliant reactance) without the risk of instability. The traditional linear source-filter theory is encumbered with possible inconsistencies in the glottal flow spectrum, which is shown to be influenced by interaction. In addition, the linear theory does not predict bifurcations in the dynamical behavior of vocal fold vibration due to acoustic loading by the vocal tract. (c) 2008 Acoustical Society of America.