Recent advances in high-speed acoustic holography have enabled levitation-based volumetric displays with tactile and audio sensations. However, current approaches do not compute sound scattering of objects’ surfaces; thus, any physical object inside can distort the sound field. Here, we present a fast computational technique that allows high-speed multipoint levitation even with arbitrary sound-scattering surfaces and demonstrate a volumetric display that works in the presence of any physical object. Our technique has a two-step scattering model and a simplified levitation solver, which together can achieve more than 10,000 updates per second to create volumetric images above and below static sound-scattering objects. The model estimates transducer contributions in real time by reformulating the boundary element method for acoustic holography, and the solver creates multiple levitation traps. We explain how our technique achieves its speed with minimum loss in the trap quality and illustrate how it brings digital and physical content together by demonstrating mixed-reality interactive applications.

中文翻译：

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具有任意散射物体的高速声全息术

高速声全息术的最新进展使基于悬浮的体积显示具有触觉和听觉感觉成为可能。然而，目前的方法不计算物体表面的声音散射；因此，内部的任何物理对象都会扭曲声场。在这里，我们提出了一种快速计算技术，即使在任意声音散射表面上也能实现高速多点悬浮，并展示了在任何物理对象存在的情况下都可以工作的体积显示。我们的技术有一个两步散射模型和一个简化的悬浮求解器，它们一起可以实现每秒超过 10,000 次更新，以在静态声音散射对象的上方和下方创建体积图像。该模型通过重新制定声全息的边界元方法来实时估计换能器的贡献，求解器创建多个悬浮陷阱。我们解释了我们的技术如何以最小的陷阱质量损失实现其速度，并通过演示混合现实交互式应用程序来说明它如何将数字和物理内容结合在一起。