Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby DK-2800, Denmark.
J Acoust Soc Am. 2011 Apr;129(4):1981-90. doi: 10.1121/1.3552881.
Talkers adjust their vocal effort to communicate at different distances, aiming to compensate for the sound propagation losses. The present paper studies the influence of four acoustically different rooms on the speech produced by 13 male talkers addressing a listener at four distances. Talkers raised their vocal intensity by between 1.3 and 2.2 dB per double distance to the listener and lowered it as a linear function of the quantity "room gain" at a rate of -3.6 dB/dB. There were also significant variations in the mean fundamental frequency, both across distance (3.8 Hz per double distance) and among environments (4.3 Hz), and in the long-term standard deviation of the fundamental frequency among rooms (4 Hz). In the most uncomfortable rooms to speak in, talkers prolonged the voiced segments of the speech they produced, either as a side-effect of increased vocal intensity or in order to compensate for a decrease in speech intelligibility.
说话者会根据不同的距离调整发声力度，以补偿声音传播的损失。本文研究了四个声学环境对 13 名男性说话者在向四个距离的听众说话时产生的语音的影响。说话者将声音强度提高了 1.3 到 2.2dB 之间，以适应与听众距离的两倍增加，并以 -3.6dB/dB 的速率作为“房间增益”的线性函数降低声音强度。说话者的基频平均值也存在显著差异，包括距离（每增加一倍距离增加 3.8Hz）和环境（4.3Hz），以及房间之间基频的长期标准偏差（4Hz）。在最不舒适的说话环境中，说话者会延长他们所发出的语音的浊音段，这可能是由于声音强度增加的副作用，或者是为了补偿语音可懂度的下降。
