室内声场模拟中的界面声散射

室内声场模拟中引入扩散反射对提高模拟的准确性具有重要意义,但采用单值散射系数无法完整表示界面的扩散反射特性。受几何声学中扩散反射模拟方法的限制,界面有效散射系数存在不确定性。通过改变一个矩形房间中的吸声量、吸声布置方式及表面几何复杂程度等声场条件,对混响时间的模拟值与实测值进行比较,分析了由界面散射系数不确定性产生的模拟偏差与房间内声场扩散的关系。

Sound scattering in room acoustic modeling

Sound scattering is important in computer simulation of geometric room acoustic modeling. The scattering on room boundaries can not be fully characterized only by a single-valued scattering coefficient, therefore the uncertainty of determining scattering coefficient is adopted in modeling. An example of simple rectangular room model is illustrated in this paper with various amounts and dispositions of absorption, and different geometrical complexity of surfaces. The deviations of reverberation time prediction due to the uncertainty of scattering coefficient are investigated by comparing with measurement results.