Sound diffusion is a well known and desired subject in room acoustics; however it is hardly achievable especially in small rooms and low frequencies. Going toward that goal has been the subject of many researches. This paper try to investigate sound source directionality effects on room frequency response, by considering source directivity and surface diffusivity in a model based on Boundary Element Method. Evaluations of the predictions from the room acoustic modeling program have been run using two source types with the same sound power: (a) an omni-directional source; (b) a realistically-directional source with different directionalities together with different combination of diffusive surfaces on room’s walls. Analyses have been run for three source/receiver combinations in two rooms on relative sound pressure level (SPL) at low frequencies. Diffusive surfaces are implemented on different rooms’ walls and applied to the model. The results also confirm the relation of sound diffusion to surface diffusivity and show what combinations of surface diffusivity and source directivity could lead to a more smooth frequency response.
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