Most of today’s room acoustics programs make use of scattering coefficients which are used in order to describe surface scattering (roughness of material) and scattering of reflected sound caused by limited surface size (diffraction). A method which combines scattering caused by diffraction due to typical surface dimensions, angle of incidence and incident path length with surface scattering is presented. Each of the two scattering effects are modelled as frequency dependent functions.

The presentation at Forum Acusticum contains some developments to the algorithms which were not included in the paper