Kaizuka Tsutomu, Onodera Wataru
Department of Mechanical Science and Engineering, Kogakuin University 2665-1 Nakano-machi, Hachioji-shi, Tokyo 192-0015,
JASA Express Lett. 2023 Sep 1;3(9). doi: 10.1121/10.0020812.
In personal audio systems, sounds should propagate toward the listening point and attenuate beyond the listening point. This study deals with controlling directivity and distance attenuation using loudspeaker arrays. The array signal processing is based on tangent line method (TLM), which can generate acoustic beams following arbitrary convex trajectories. A curvilinear acoustic beam is produced as an envelope of tangent lines, i.e., straight acoustic beams. Specifying the envelope length enables controlling distance attenuation while enhancing directivity. In this study, the TLM for arbitrary circular trajectories is formulated. Optimization algorithm is applied to identify the trajectory maximizing acoustic contrast.
在个人音频系统中，声音应朝着收听点传播，并在收听点之外衰减。本研究涉及使用扬声器阵列控制指向性和距离衰减。阵列信号处理基于切线法（TLM），该方法可以生成沿任意凸轨迹的声束。曲线声束是作为切线（即直声束）的包络产生的。指定包络长度可在增强指向性的同时控制距离衰减。在本研究中，制定了用于任意圆形轨迹的切线法。应用优化算法来识别使声学对比度最大化的轨迹。
