THURSDAY MORNING, 16 MAY 2019 FRENCH, 8:15 A.M. TO 11:35 A.M. Session 4aAA Architectural Acoustics, Signal Processing in Acoustics, and Noise: Methods and Techniques Used for Simulation of Room Acoustics Bruce C. Olson, Cochair AFMG Services North America LLC, 8717 Humboldt Avenue North, Brooklyn Park, MN 55444 Ana M. Jaramillo, Cochair Ahnert Feistel Media Group, 8717 Humboldt Ave. N, Brooklyn Park, MN 55444 Chair’s Introduction—8:15 Invited Papers 8:20 4aAA1. Level of detail in room-acoustic simulation. Michael Vorlaender (ITA, RWTH Aachen Univ., Kopernikusstr. 5, Aachen 52056, Germany,
[email protected]) The quality of present-day room acoustic simulations depends on the quality of the boundary conditions and of the underlying CAD room models. A “high-resolution” room model does not mean that it needs to have a visually perfect geometrical fine structure. To our experience, the required resolution of objects or surfaces does not need to be higher than about 1 m. In this presentation, an auralization engine is briefly introduced which uses a set of models of the same room but with a graduated level of detail (LOD). These different models can account for more physical correctness especially for very low-frequency specular reflections. Furthermore, a good estimate of scattering coefficients is essential. The relevance of the uncertainty of scattering coefficient data is discussed in a review on perception tests with varied surface scattering. Finally, guidelines for creation of CAD models are proposed. 8:40 4aAA2. Should we still rely on statistical calculations for the prediction of reverberation time? Ana M.