Conference_programme: 18.8 - Recent trends in numerical modeling: protocols and reliability

Lecture: Scattering surface modelling in geometrical acoustic models

Author(s): Shtrepi Louena, Astolfi Arianna, Masoero Marco

Summary:
Diffusive surfaces and their scattering properties have been the object of several research works regarding the geometrical acoustic simulations. The level of detail used to model these surfaces is of great importance for the effort in modeling and computational load. To this aim an investigation has been performed in a shoebox concert hall through in-situ measurements and simulations using Odeon software. Three configurations of the hall’s walls, that is, 1) flat, 2) small triangular diffusers, and 3) big triangular diffusers have been measured and simulated in order to determine objectively the differences between two modeling alternatives. The two modeling alternatives consist of a) flat surfaces with surface scattering coefficient applied and (b) triangular relief modeled including edge diffraction. The analysis has been performed by investigating the conventional acoustic parameters such as early decay time (EDT), reverberation time (T30), clarity (C80), definition (D50), and interaural cross correlation (IACC). The differences of the materials properties variation in the calibration procedure have been outlined. Moreover a subjective investigation based on the triangle-method has been performed in order to determine the sensitivity of listeners to the surface diffusivity variations.

Corresponding author

Name: Dr Louena Shtrepi

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Country: Italy