Modularity of noise sources
MithraSON integrates both transport noise (light vehicles, utility vehicles, tramways) and a large library of urban sources (fountains, cafes, equipment, etc.) that can be further enriched by the user. The urban sources are modelled either by fixed sources, point sources or linear, either by mobile sources along a trajectory, or in the form of residual noise.
Dynamic simulation of urban traffic
The simulation of transport noise employs an integrated real time traffic engine that permits taking numerous parameters into account, such as management of priorities at intersections, speed limit zones and of course average speed flows. The movements of each vehicle is thus finely modelled.
Realistic vehicle noise synthesis
Relying on a patented method issuing from CSTB research, MithraSON generates vehicle noise in real time and in a highly realistic manner. In particular, cars and utility vehicles including engine noise linked to engine speed, itself depending on the gear used, and including the tyre/road interaction noise. These two noises are generated in real time based on the change in speed of the vehicle, giving the numerous accelerations and decelerations present in towns.
Taking into account the effects of acoustic propagation
The acoustic calculations utilise the in common cartography computation engine of MithraSIG which implements most of the standardised methods for predicting noise in an external milieu (NMPB 2008, ISO 9613-2, Cnossos-EU). The significant propagation effects are thus taken into account in predicting the exposure levels and the auditive simulation. In particular, the propagation paths between a source and a receiver are calculated using a rapid ray tracing algorithm coupled with the taking into account of the acoustic propagation effects (reflections from buildings, ground effects, road surface type, diffraction via screens).
Calculation of dynamic noise acoustic indicators
During a simulation, MithraSON calculates in real time and records the evolution of the instantaneous sound levels, as would a sound-level meter. The ensemble of standard indicators used to characterise temporal evolution of exposure levels are thus available, in particular the maximum level LAmax or the statistical levels L A10 , L A50 , L A90.
Spatial sound restitution (stereo, binaural listening, ambisonics…)
For a better immersion in the scene, MithraSON equally offers several audio renderings to return the soundscape.
- binaural (headphone), which permits full 3D spatial restitution
- multi-loudspeaker restitution for spatialized listening by several persons.
Moreover, a restitution calibration procedure guarantees the validity of the levels returned if the user so wishes.
Did you know ?
MithraSON issues from CSTB research in the domain of external sound levels prediction and auralisation. These techniques were initially implemented in a site noise simulator developed for Bouygues TP, By-OASIS. Following this, the coupling of the traffic engine and the synthesis of engine noise and road interaction synthesizer were integrated into the tool and used for the first time by the Conseil Général du Nord with a view to public consultations concerning road improvement projects.
Minimum configuration required :
• Processor: processor i5 or above, 4 cores or more
• RAM: 4 Gb minimum (8 Gb recommended)
• Minimum screen resolution: 1280 x 1024
Operating systems supported :
• Windows 7 and above – 64 bit version
The software is available in French.