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扁平空间是水平方向尺寸远大于高度的体型不规整空间,经典扩散声场理论不适用。本文运用声像法分析了界面作镜面反射条件下的扁平空间中的声能衰减特性,以及各主要因素的影响。模拟结果表明:近场处的声能衰减曲线呈明显的下凹状,混响时间大于早期衰变时间;随着接收点到声源距离的增大,混响时间和早期衰变时间均迅速地到达各自的最大值,然后缓慢地下降;增加底面和顶面的吸声系数差异可以有效地降低远场处的混响时间。
Flat space is the size of the horizontal size is much larger than the height of the irregular space, the classical diffusion sound field theory does not apply. In this paper, the acoustic energy attenuation characteristics of the flat space under the condition of specular reflection are analyzed by using the sound image method, and the influences of the main factors are also analyzed. The simulation results show that the acoustic energy attenuation curve at the near field is obviously concave and the reverberation time is greater than the early decay time. As the distance from the receiving point to the sound source increases, the reverberation time and the early decay time rapidly reach their respective Of the maximum value, and then slowly decline; increase the difference between the bottom and the top of the sound absorption coefficient can effectively reduce the far-field reverberation time.