WSEAS Transactions on Acoustics and Music
Print ISSN: 1109-9577
Volume 6, 2019
Omnidirectional Source Modeling for Ray Tracing in Room Acoustics with Specular Reflection
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Abstract: The aim of this work is to show that the use of a ray tracing method based on stratified Monte Carlo with cells of equal area and equal aspect ratio gives the most convincing results in room acoustic simulation. It is compared with three other methods: the first one is very close but simply uses equal area cells, the second one is a Monte Carlo importance sampling and the last one is a standard Monte Carlo where the values of the spherical coordinates of the rays are generated randomly. These methods have similar complexity and comparable implementation. The experimentation is conducted in three steps: calculation of the sphere volume, exploration for reflections paths in a hexahedral enclosure, evaluation of standard acoustic parameters (Lateral Energy Fraction and Deutlichkeit). By starting from the volume of the sphere, the integration formula of sound rays contributions to a spherical receiver is derived in a transparent and purely geometric way.
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Pages: 13-22
WSEAS Transactions on Acoustics and Music, P-ISSN: 1109-9577, Volume 6, 2019, Art. #3