Time reversal (TR) is a signal processing technique often used to generate focusing at selected positions within reverberant environments. This study investigates the effect of the location of the focusing, with respect to the room wall boundaries, on the amplitude of the focusing and the uniformity of this amplitude when focusing at various room locations. This is done experimentally with eight sources and two reverberation chambers. The chambers are of differing dimensions and were chosen to verify the findings in different volume environments. Multiple spatial positions for the TR focusing are explored within the rooms' diffuse field, against a single wall, along a two-wall edge, and in the corners (three walls). Measurements of TR focusing at various locations within the room show that for each region of study, the peak amplitude of the focusing is quite uniform, and there is a notable and consistent increase in amplitude for each additional wall that is adjacent to the focal location. A numerical model was created to simulate the TR process in the larger reverberation chamber. This model returned results similar to those of the experiments, with spatial uniformity of focusing within the room and increases when the focusing is near adjacent walls.

中文翻译：

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房间位置对时间反转聚焦幅度的影响

时间反转 (TR) 是一种信号处理技术，通常用于在混响环境中的选定位置生成聚焦。本研究调查了聚焦位置相对于房间墙壁边界对聚焦幅度的影响以及在不同房间位置聚焦时该幅度的均匀性。这是用八个声源和两个混响室通过实验完成的。这些房间有不同的尺寸，被选择用来验证不同体积环境中的发现。TR 聚焦的多个空间位置在房间的漫射场内、单墙、两墙边缘和角落（三墙）中进行了探索。在房间内不同位置聚焦的 TR 测量表明，对于每个研究区域，聚焦的峰值幅度非常均匀，并且与焦点位置相邻的每个附加壁的幅度都有显着且一致的增加。创建了一个数值模型来模拟较大混响室中的 TR 过程。该模型返回的结果与实验结果相似，房间内聚焦的空间均匀性增加，当聚焦靠近相邻墙壁时会增加。