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Geometrical acoustics is well suited for simulating room reverberation ininteractive real-time applications. While the image source model (ISM) isexceptionally fast, the restriction to specular reflections impacts itsperceptual plausibility. To account for diffuse late reverberation, hybridapproaches have been proposed, e.g., using a feedback delay network (FDN) incombination with the ISM. Here, a computationally-efficient, digital-filterapproach is suggested to account for effects of non-specular reflections in theISM and to couple scattered sound into a diffuse reverberation model using aspatially rendered FDN. Depending on the scattering coefficient of a roomboundary, energy of each image source is split into a specular and a scatteredpart which is added to the diffuse sound field. Temporal effects as observedfor an infinite ideal diffuse (Lambertian) reflector are simulated usingcascaded all-pass filters. Effects of scattering and multiple (inter-)reflections caused by larger geometric disturbances at walls and by objects inthe room are accounted for in a highly simplified manner. Using a singleparameter to quantify deviations from an empty shoebox room, each reflection istemporally smeared using cascaded all-pass filters. The proposed method wasperceptually evaluated against dummy head recordings of real rooms.

Computationally-efficient and perceptually-motivated rendering of diffuse reflections in room acoustics simulation