Technical Papers
Ambient sound propagation
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Technical Papers
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TimeWednesday, 5 December 20185:33pm - 5:59pm
DescriptionAmbient sounds arise from a massive superposition of chaotic events distributed
over a large area or volume, such as waves breaking on a beach or
rain hitting the ground. The directionality and loudness of these sounds as
they propagate in complex 3D scenes vary with listener location, providing
cues that distinguish indoors from outdoors and reveal portals and occluders.
We show that ambient sources can be approximated using an ideal notion of
spatio-temporal incoherence and develop a lightweight technique to capture
their global propagation effects. Our approach precomputes a single FDTD
simulation using a sustained source signal whose phase is randomized over
frequency and source extent. It then extracts a spherical harmonic encoding
of the resulting steady-state distribution of power over direction and position
in the scene using an efficient flux density formulation. The resulting
parameter fields are smooth and compressible, requiring only a few MB
of memory per extended source. We also present a fast binaural rendering
technique that exploits phase incoherence to reduce filtering cost.
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