Multiple-reflection diffuse-scattering model for noise propagation in streets

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Abstract
The sound fieldgenerated by an omnidirectional point source in an infinitely long, straight street is considered. The field is assumed to be the sum of a multiply‐specularly reflected field and a diffuse field that is fed from scattering at the walls at each reflection of the specular field. It is shown that scattering is important close to the source. The sound level depends on the width of the street and the height of the walls and on the reflection and scattering coefficients of the walls.