Comparison between measured and calculated parameters for the acoustical characterization of small classrooms
Comparison between measured and calculated parameters for the acoustical characterization of small classrooms
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DOI：
10.1016/j.apacoust.2007.08.001
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发表时间：
2008-11-01
影响因子：
3.4
通讯作者：
Griginis, Alessia
中科院分区：
文献类型：
--
作者：
Astolfi, Arianna;Corrado, Vincenzo;Griginis, Alessia
本文介绍了八个高中教室的声学参数的测量和计算之间的比较。中频未占用和占用混响时间和1 kHz的声音传播（SP）的混响和总语音水平在占用教室进行了比较与分析和数值预测。的ODEON 6.5代码和Sabine公式给出了最准确的结果混响时间在空教室的整体相对差异分别为8.1%和9.7%。在学生在场的情况下，Eyring和Sabine公式以及Hodgson的经验模型是最准确的，相对差异分别为11.1%、13.2%和13.6%。混响语音水平随着与源的距离的增加以从-1.21到-2.62dB/距离加倍的速率降低，并且Hodgson模型非常好地拟合斜率值。混响和总语音水平的SP的最佳预测示出，按照准确度的顺序，为ODEON代码，巴伦和李理论和经典的扩散场理论。当使用测量的总声反射时，发现均方根误差较低。对于ODEON码和巴伦和李理论，总语音电平的SP的最低均方根误差为1.4 dB。(C)2007爱思唯尔有限公司保留所有权利。
This paper presents a comparison between measured and calculated acoustical parameters in eight high school classrooms. The mid frequency unoccupied and occupied reverberation times and the 1 kHz sound propagation (SP) of the reverberant and total speech levels in occupied classrooms were compared with analytical and numerical predictions. The ODEON 6.5 code and the Sabine formula gave the most accurate results for reverberation time in the empty classrooms with overall relative differences of 8.1% and 9.7%, respectively. With students present, the Eyring and Sabine formulas and Hodgson's empirical model resulted to be the most accurate with relative differences of 11.1%, 13.2%, and 13.6%, respectively. The reverberant speech levels decrease with increasing distance from the source at rates varying from -1.21 to -2.62 dB/distance doubling, and the Hodgson model fits the slope values quite well. The best predictions of the SP of the reverberant and total speech levels are shown, in order of accuracy, for the ODEON code, the Barron and Lee theory and the classical diffuse field theory. Lower rms errors were found when the measured total acoustic absorptions were used. The lowest rms error of 1.4 dB for the SP of the total speech level were found for both the ODEON code and the Barron and Lee theory. (C) 2007 Elsevier Ltd. All rights reserved.