- simulation of different shapes
- simulation of porous and resonance absorbers as well as diffusors
- transfer function from source to receiver, including direct sound
- frequency dependent ballon data for source and integration of multiple sources
- simulation of full hearing range
The aim is to simulate a 120m³ listening room of a recording studio and a comparison with the already built room.
try this one..this is open source
http://i-simpa.ifsttar.fr/presentation/features0/
For small rooms, simulation programs based on geometrical acoustics algorithms (like Odeon, CATT and EASE) will not help you as the results are unreliable in low frequencies (namely, below the Schroeder's frequency of your room). Additionally, for small volumes, room modes take an important role in determining the sound field, which is not considered in such simulations.
So, for the simulation of the room, if you really need it, you can search for programs based on Finite Element Method (FEM) acoustics, which are more suitable for this case. Anyway, there are many commercial softwares based on FEM, but usually they are specific for different applications.
For "simulation of porous and resonance absorbers as well as diffusors" you can use programs for calculating absorption and transmission of multi-layer structures, like AFMG SoundFlow (free for a month).
If your intention is to do simulations in the full audible frequency range, then you probably need to combine geometrical acoustic (GA) simulations for the high frequency range, roughly above the Schroeder frequency, and numerical simulations like FEM for the low frequency range. FEM can of cause in principle be used in the full frequency range, but the computational time will be too long.
If you only want to use one program, COMSOL can do both, even if the GA ray tracing there is somewhat limited as compared to, e.g., ODEON.
Odeon or any other of the pro mixed use geometrical and raytraysing tools will work for this, but some additional tools for absorption calculation is necessary. For the room mode calculations you ca e.g. use REW for a first hard wall assumption result for placement of absorbers or difusors etc. But it is also useful to measure the room and then decide how to finish off the placement of different types of absorbers.
No tool is expected to predict all in detail, not even FEA or BEA which soon fails when the modal overlap increases.
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