Key Laboratory of Modern Acoustic, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
J Acoust Soc Am. 2011 Apr;129(4):1972-80. doi: 10.1121/1.3553223.
Different non-exponential decays such as the concave and the convex double sloped decays in the coupled rooms provide distinct sound qualities. These are commonly considered to occur in the less reverberant sub-room and the more reverberant sub-room, respectively. However, numerical simulations and experiments in this paper show that the demarcation line is not located along the physical boundaries (e.g., the partition and the coupling aperture), but in the more reverberant sub-room. The sound field with the concave double sloped decay penetrates into the auxiliary sub-room to an extent which is influenced by the difference between the two natural reverberations of the sub-rooms. Furthermore the sound energy flows in different regions are investigated, demonstrating how energy feedback leads to the concave double sloped decay.
不同的非指数衰减，如耦合房间中的凹形和凸形双斜率衰减，提供了不同的音质。这些通常被认为分别发生在混响较小的次室和混响较大的次室中。然而，本文中的数值模拟和实验表明，分界线并不位于物理边界（例如，分隔物和耦合孔）处，而是在混响较大的次室中。具有凹形双斜率衰减的声场会渗透到辅助次室中，其程度受到两个次室的自然混响之间差异的影响。此外，还研究了不同区域的声能流，展示了能量反馈如何导致凹形双斜率衰减。
