Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, Building 352, DK-2800 Kongens Lyngby, Denmark.
J Acoust Soc Am. 2012 Apr;131(4):2565-9. doi: 10.1121/1.3693657.
The effect known as "weak Anderson localization," "coherent backscattering," or "enhanced back-scattering" is a physical phenomenon that occurs in random systems, e.g., disordered media and linear wave systems, including reverberation rooms: The mean square response is increased at the drive point. In a reverberation room, this means that one can expect an increase of the reverberant sound field at the position of the source that generates the sound field. This affects the sound power output of the source and is therefore of practical concern. The relative increase of reverberant energy is described by the concentration factor, which is usually assumed to be 2. However, because of the stronger direct sound field at the source position, it is obviously very difficult to measure this quantity directly under steady-state conditions. A related parameter of crucial importance for the ensemble statistics of responses in rooms is the modal kurtosis, which is usually assumed to be 3. The modal kurtosis is also very difficult to measure directly. This paper presents the results of an indirect experimental estimation of the two parameters.
被称为“弱安德森局域化”、“相干背散射”或“增强背散射”的效应是一种在随机系统中发生的物理现象，例如无序介质和线性波系统，包括混响室：平均响应平方在驱动点处增加。在混响室中，这意味着人们可以预期声源位置的混响声场会增加，从而影响声源的声功率输出，因此这是实际关注的问题。混响能量的相对增加由浓度因子描述，通常假定为 2。但是，由于声源位置处的直接声场更强，因此在稳态条件下直接测量此数量显然非常困难。对于房间中响应的总体统计而言，另一个非常重要的相关参数是模态峰度，通常假定为 3。模态峰度也很难直接测量。本文介绍了这两个参数的间接实验估计结果。
