Molés-Cases Vicent, Elliott Stephen J, Cheer Jordan, Piñero Gema, Gonzalez Alberto
Institute of Telecommunications and Multimedia Applications, Universitat Politècnica de València, València 46022, Spain.
Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom.
J Acoust Soc Am. 2022 Jan;151(1):334. doi: 10.1121/10.0009275.
Personal sound zones (PSZ) systems use an array of loudspeakers to render independent audio signals to multiple listeners within a room. The performance of a PSZ system, designed using weighted pressure matching, depends on the selected target responses for the bright zone. In reverberant environments, the target responses are generally chosen to be the room impulse responses from one of the loudspeakers to the control points in the selected bright zone. This approach synthesizes the direct propagation component and all the reverberant components in the bright zone, while minimizing the energy in the dark zone. We present a theoretical analysis to show that high energy differences cannot be achieved for the diffuse reverberant components in the bright and dark zones, and so trying to synthesize these components in the bright zone does not lead to the best performance. It is then shown that the performance can be improved by using windowed versions of these measured impulse responses as target signals, in order to control which reverberant components are synthesized in the bright zone and which are not. This observation is supported by experimental measurements in two scenarios with different levels of reverberation.
个人声区（PSZ）系统使用扬声器阵列在房间内为多个听众呈现独立的音频信号。采用加权压力匹配设计的PSZ系统的性能取决于为明亮区域选择的目标响应。在混响环境中，目标响应通常选择为从其中一个扬声器到选定明亮区域控制点的房间脉冲响应。这种方法合成了明亮区域中的直接传播分量和所有混响分量，同时将暗区中的能量降至最低。我们进行了一项理论分析，结果表明，明亮区和暗区中的扩散混响分量无法实现高能量差异，因此试图在明亮区合成这些分量并不能带来最佳性能。然后表明，通过使用这些测量脉冲响应的加窗版本作为目标信号，可以提高性能，以便控制哪些混响分量在明亮区合成，哪些不合成。在两种不同混响水平的场景中进行的实验测量支持了这一观察结果。
