Bauer Jay J, Mittal Jay, Larson Charles R, Hain Timothy C
Department of Communication Sciences and Disorders, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201-0413, USA.
J Acoust Soc Am. 2006 Apr;119(4):2363-71. doi: 10.1121/1.2173513.
The present study tested whether subjects respond to unanticipated short perturbations in voice loudness feedback with compensatory responses in voice amplitude. The role of stimulus magnitude (+/- 1,3 vs 6 dB SPL), stimulus direction (up vs down), and the ongoing voice amplitude level (normal vs soft) were compared across compensations. Subjects responded to perturbations in voice loudness feedback with a compensatory change in voice amplitude 76% of the time. Mean latency of amplitude compensation was 157 ms. Mean response magnitudes were smallest for 1-dB stimulus perturbations (0.75 dB) and greatest for 6-dB conditions (0.98 dB). However, expressed as gain, responses for 1-dB perturbations were largest and almost approached 1.0. Response magnitudes were larger for the soft voice amplitude condition compared to the normal voice amplitude condition. A mathematical model of the audio-vocal system captured the main features of the compensations. Previous research has demonstrated that subjects can respond to an unanticipated perturbation in voice pitch feedback with an automatic compensatory response in voice fundamental frequency. Data from the present study suggest that voice loudness feedback can be used in a similar manner to monitor and stabilize voice amplitude around a desired loudness level.
本研究测试了受试者是否会对语音响度反馈中意外出现的短暂干扰做出语音幅度的补偿反应。比较了刺激幅度（±1、3与6 dB声压级）、刺激方向（上升与下降）以及持续语音幅度水平（正常与轻柔）在各种补偿情况下的作用。受试者在76%的情况下会对语音响度反馈中的干扰做出语音幅度的补偿性变化。幅度补偿的平均潜伏期为157毫秒。1 dB刺激干扰的平均反应幅度最小（0.75 dB），6 dB条件下的平均反应幅度最大（0.98 dB）。然而，以增益表示时，1 dB干扰的反应最大，几乎接近1.0。与正常语音幅度条件相比，轻柔语音幅度条件下的反应幅度更大。一个音频 - 发声系统的数学模型捕捉到了补偿的主要特征。先前的研究表明，受试者可以对语音音高反馈中的意外干扰做出语音基频的自动补偿反应。本研究的数据表明，语音响度反馈可以以类似的方式用于监测和稳定围绕所需响度水平的语音幅度。
