Contribution
Methodology of the SDE-Standard to Calculate Sound Systems at any Distance utilizing Decoherence Effects
* Presenting author
Abstract:
In order to calculate sound systems from different manufacturers deployed at outdoor entertainment events at any distance in the context of noise predictions correctly and reproducibly, the SDE-Standard not only describes how the data of designed sound systems is exported, but also a methodology how to use it with the complex directivity point source model (CDPS) considering decoherence effects. The advantage of utilizing a CDPS approach in environmental noise software for distributed correlated sources such as sound systems is, that the calculation is valid at any distance. In contrast, when using precalculated far-field directivities for source groups, the levels in the audience and at receiver points near the event are incorrect and the relation of the noise levels is lost. Especially at low frequencies, which are increasingly considered, the interference between source groups causes the transition to the far-field to be farther away than close by receiver points, especially off the main shooting direction. At higher frequencies on the other hand, the coherence is gradually lost. In order to ensure reproducible results in different software, a methodology is described in den SDE-Standard how to include decoherence effects.