Hsiao T Y, Solomon N P, Luschei E S, Titze I R
Department of Speech Pathology and Audiology, University of Iowa, Iowa City 52242.
J Voice. 1994 Sep;8(3):224-9. doi: 10.1016/s0892-1997(05)80293-0.
The variations in voice fundamental frequency (F0) that occur during vibrato production may be produced, at least in part, by modulation of laryngeal muscle activity. We have quantified this relation by using a cross-correlation analysis of the changes in F0 during vibrato and the changes either in motor unit firing rate or in gross electromyographic activity from the cricothyroid (CT) and the thyroarytenoid (TA) muscles. Two trained amateur tenors provided the data. Correlations were generally quite strong (mean r for the CT was 0.72 for singer 1 and 0.50 for singer 2; mean r for the TA was 0.31 for singer 2), thus providing support for previous evidence that fundamental frequency modulation in vibrato involves active modulation of the laryngeal motoneuron pool, especially by the CT muscle. In addition, phase delays between muscle modulation and changes in fundamental frequency were substantial (averaging approximately 130 degrees for the CT and 140 degrees for the TA). This finding may help provide insight regarding the mechanisms responsible for the production of vibrato.
在颤音产生过程中出现的嗓音基频（F0）变化，至少部分可能是由喉肌活动的调制产生的。我们通过对颤音期间F0的变化与运动单位放电率或环甲肌（CT）和甲杓肌（TA）的总肌电图活动变化进行互相关分析，对这种关系进行了量化。两名训练有素的业余男高音提供了数据。相关性通常相当强（歌手1的CT平均r为0.72，歌手2为0.50；歌手2的TA平均r为0.31），从而为先前的证据提供了支持，即颤音中的基频调制涉及喉运动神经元池的主动调制，尤其是由CT肌进行的调制。此外，肌肉调制与基频变化之间的相位延迟相当大（CT平均约为130度，TA平均约为140度）。这一发现可能有助于深入了解颤音产生的机制。
