The impact of paintings hung on lecture room walls on the speech intelligibility and perception of background noise
The impact of paintings hung on lecture room walls on the speech intelligibility and perception of background noise
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DOI：
10.1177/1420326x15572640
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发表时间：
2016-07
影响因子：
3.6
通讯作者：
M. Čudina;J. Prezelj;M. Pušlar-Čudina
中科院分区：
文献类型：
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作者：
M. Čudina;J. Prezelj;M. Pušlar-Čudina
为语音设计的房间（教室或演讲室）最重要的参数是语音清晰度。语音清晰度取决于混响时间、语音噪声比和房间的几何形状等。在卢布尔雅那大学机械工程学院，观察到教室的混响时间超过了最佳值，从 0.31 秒到 0.87 秒，其中一些教室的语音清晰度低于良好甚至令人满意的阈值。为了减少混响时间并提高语音清晰度，提出了另一种方法，即在房间墙壁上悬挂艺术画。实验表明，通过这样做，可以通过将频谱中最易听到的部分（500 至 1500 Hz 之间）的吸收系数增加 30% 以上来减少混响时间。可以通过使用不同尺寸的绘画、画布后面不同的空气空间、适当的涂料层厚度以及在画布后面添加吸收材料来增加吸收系数。主观测试还表明，具有适当颜色组合的绘画（柔和的颜色与流行的绿色、蓝色和灰色）适合通过改变大脑的感知来缓解背景声音（噪音）的不良影响。
The most important parameter for rooms designed for speech (classroom or lecture room) is speech intelligibility. Speech intelligibility depends on the reverberation time, speech-to-noise ratio and geometry of the room, among others. At the Faculty of Mechanical Engineering, University of Ljubljana, the reverberation times in lecture rooms observed exceed the optimal value from 0.31 to 0.87 s and in some of them, speech intelligibility is below the threshold of good or even satisfactory. For reducing reverberation time and improving speech intelligibility, an alternative method was proposed, by hanging art paintings on the room walls. Experiments have shown that by doing so, reverberation time can be reduced by increasing the absorption coefficient by more than 30% in the most audible part of the frequency spectra (between 500 and 1500 Hz). The absorption coefficient can be increased by using different dimensions of paintings, different air spaces behind the canvas, by appropriate thickness of the paint layers and by adding absorption material behind the canvas. Subjective tests have also shown that paintings with proper colour combinations (pastel colours with prevailing green, blue and grey colours) are appropriate for soothing the undesirable effect of background sound (noise) by changing perception in the brain.