Precomputed acoustic transfer: output-sensitive, accurate sound generation for geometrically complex vibration sources
Precomputed acoustic transfer: output-sensitive, accurate sound generation for geometrically complex vibration sources
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预先计算的声学传递：针对几何复杂振动源的输出敏感、精确的声音生成
DOI：
10.1145/1179352.1141983
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Pai
中科院分区：
文献类型：
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作者：
Doug L. James;J. Barbič;D. Pai
模拟真实振动物体产生的声音是具有挑战性的，因为声辐射涉及复杂的衍射和相互反射效应，这些效应是非常可感知和重要的。这些波现象被很好地理解，但由于在音频速率下计算它们的高成本和复杂性，在计算机图形学中很大程度上被忽略了。我们描述了一种实时合成刚体真实声辐射的新算法。我们首先预先计算物体的线性振动模式，然后使用数值声学的标准方法将每种模式与声压场或声传递函数联系起来。然后使用放置在物体附近的低阶多极源将每个传递函数近似为指定的精度。我们提供了一种低内存、多级、随机化的算法，用于优化源位置，适用于复杂的几何形状。在运行时，我们可以通过快速汇总每个模式等效多极源的贡献来模拟新的交互声音。我们可以有效地模拟全局效应，如相互反射和由于听众位置而引起的声音变化。模拟成本可以动态地与声音质量相权衡。我们提出了几个基于物理动画的声音生成的例子。
Simulating sounds produced by realistic vibrating objects is challenging because sound radiation involves complex diffraction and interreflection effects that are very perceptible and important. These wave phenomena are well understood, but have been largely ignored in computer graphics due to the high cost and complexity of computing them at audio rates.We describe a new algorithm for real-time synthesis of realistic sound radiation from rigid objects. We start by precomputing the linear vibration modes of an object, and then relate each mode to its sound pressure field, or acoustic transfer function, using standard methods from numerical acoustics. Each transfer function is then approximated to a specified accuracy using low-order multi-pole sources placed near the object. We provide a low-memory, multilevel, randomized algorithm for optimized source placement that is suitable for complex geometries. At runtime, we can simulate new interaction sounds by quickly summing contributions from each mode's equivalent multipole sources. We can efficiently simulate global effects such as interreflection and changes in sound due to listener location. The simulation costs can be dynamically traded-off for sound quality. We present several examples of sound generation from physically based animations.
DOI：
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发表时间：
1996-11
期刊：
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影响因子：
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作者：
Kees van de Doel;D. Pai
通讯作者：
Kees van de Doel;D. Pai