Reflection

Additional sound rays appear in the sector of the path of sound propagation from reflective objects which affect the receiver and could increase the sound level.

The mirror-source method will be applied regularly by the calculation of reflection and it is therefore assumed that the reflective areas are „acoustically even“. In the experience of engineering the numerical calculation of diffuse reflection has only been achieved over the statistical approach for the density of scattering objects (see e.g. Kut-1967). A numerically correct resolution for point-precise calculation with diffuse reflection is dealt with in Pro-1988. But this is still a lavish resolution for the professional practice.

On the other hand the mirror-source method has been proved excellent for the propagation of sound, also in cases strictly without even areas. The propagation of sound including reflection up to an extremely high order has been described precisely (see to this Pro-1990 and 3760-93) for industry halls in which the surfaces areas are anything but even (through extensions such as pipelines and so on).