On 13 March 2008 at 14:08, thomas fisher <studio1(a)commspeed.net> wrote:
On Thursday 13 March 2008 00:58:26 Kevin Cosgrove
wrote:
I've been trying to find a simulator for room
acoustics which
will allow me to construct a non-rectangular shaped room,
specify absorptive characteristics of the surfaces, specify
sound sources, and listening position. I'd like the output of
the software to be an impulse response, so that I can listen to
the predicted response, and some depiction of the standing waves
versus frequencies. Does anything like that exist for Linux?
For what it's worth, web searches lead me to some rudimentary
software to show room modes of rectangular box shaped rooms,
and there is a lot of theory out there too. But, the finished
"product" software seems scarce, or at least hard for me to find.
You might check into BRLcad, Sean Morrison responds to the forum
frequently. With this app you would be able to create a 3D model to any
degree of detail and make material assignments to all surfaces. Properties of
the materials can also be defined. Analysis can then be carried out. BRLcad
is also linkable separate FEA apps.
I just had a look at BRL-CAD. Wow! That seems like one fine CAD
program. Being general purpose, it's a bit overkill for doing just
room impulse response modeling. But, it seems like it could get the
geometry and physical properties part right. Like you say, it might
need some sort of FEA or other analysis engine. I'm guessing that
the ray tracing detailed on the BRL-CAD website (
http://brlcad.org/)
is more related to image rendering than to any kind of (sound) wave
propagation simuluation.
Thanks much...
--
Kevin