Sato Hiroshi, Bradley John S
Institute for Human Science & Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
J Acoust Soc Am. 2008 Apr;123(4):2064-77. doi: 10.1121/1.2839283.
Detailed acoustical measurements were made in 41 working elementary school classrooms near Ottawa, Canada to obtain more representative and more accurate indications of the acoustical quality of conditions for speech communication during actual teaching activities. This paper describes the room acoustics characteristics and noise environment of 27 traditional rectangular classrooms from the 41 measured rooms. The purpose of the work was to better understand how to improve speech communication between teachers and students. The study found, that on average, the students experienced: teacher speech levels of 60.4 dB A, noise levels of 49.1 dB A, and a mean speech-to-noise ratio of 11 dB A during teaching activities. The mean reverberation time in the occupied classrooms was 0.41 s, which was 10% less than in the unoccupied rooms. The reverberation time measurements were used to determine the average absorption added by each student. Detailed analyses of early and late-arriving speech sounds showed these sound levels could be predicted quite accurately and suggest improved approaches to room acoustics design.
在加拿大渥太华附近的41间小学教室进行了详细的声学测量，以获取在实际教学活动中语音交流条件下更具代表性和更准确的声学质量指标。本文描述了41间测量教室中27间传统矩形教室的室内声学特性和噪声环境。这项工作的目的是更好地了解如何改善师生之间的语音交流。研究发现，在教学活动期间，学生平均经历的情况如下：教师语音水平为60.4分贝A，噪声水平为49.1分贝A，平均信噪比为11分贝A。有人占用的教室的平均混响时间为0.41秒，比无人占用的房间少10%。混响时间测量用于确定每个学生增加的平均吸声量。对早期和晚期到达的语音声音的详细分析表明，这些声音水平可以相当准确地预测，并提出了改进室内声学设计的方法。
