Advanced propagation modeling
All acoustic calculations in MithraSound use the sound mapping computation engine of MithraSIG. This engine developed by CSTB implements most of the standardized methods for outdoor noise prediction (NMPB 2008, ISO 9613-2, CNOSSOS-EU, …). It uses a fast ray tracing algorithm coupled with the calculation of all significant propagation effects between a source and a receiver (diffractions and reflections on buildings or noise barriers, ground effects, road surface absorption, …). The same propagation effects are transformed into advanced signal processing nodes to achieve accurate and artifact free audio rendering of the scene.
MithraSound is the result of several years of research by CSTB in the field of outdoor sound propagation and auralization. The auralization techniques were initially implemented in By-OASIS, a construction site noise simulator developed for Bouygues TP. Integration of traffic simulation with vehicle engine and road noise synthesis then followed, which finally made the creation of MithraSound possible. It was used for the first time by CG59 (Conseil Général du Nord, France) for public meetings on three new road infrastructure projects.