INFLUENCE OF SOUND SCATTERING ON REVERBERATION TIME IN LARGE ROOMS

Simulation methods in room acoustics are usually based on algorithms that use rays to simulate
sound waves. These algorithms are fast and efficient in prediction of acoustic parameters, but their
shortcomings lay in neglecting of wavelengths of sound. Sound diffraction effects and non-specular
reflections of rays from rough surfaces are therefore compensated by means of scattering coefficient
δ assigned to interior surfaces in spatial models. In this article, we aim at investigation of the
influence of sound scattering, modelled according to the Lambert’s cosine law, on results of
acoustic parameters in atria. Presented results compare 9 alternatives that differ from each other in
absorption (reflective, typical and absorptive) and in surface scattering (1%, 10%, 20% and 30%).
Comparisons between alternatives are performed for reverberation time RT (s).