Eric Carmichel wrote: > The idea of recording an IR in an unusual environment* is interesting. When > I first read the original post, I wondered how closely a simulation would > match a recorded response. > Although I'm far from an expert on room acoustics, I have used simulation > software (e.g. Sabine, Odeon, CATT-Acoustics, COMSOL, etc). In addition to > the absorption coefficient of the metal, the sphere's radius, and the > listener's position, one might also wish to add the speed of sound in argon. > Pressure and temperature will affect speed of sound (and resulting > wavelengths and Eigenmodes) in gas. Is the gaseous environment a mixture of > oxygen, nitrogen, and argon that permits one to enter without problem? Would > a balloon filled with air pop in the same manner as free space if the > compressed air has no place to escape (i.e., you're adding to the net > pressure of an enclosed volume, not a place where free expansion can take > place). As usual, I'm writing off-the-cuff and my notions may be wrong, but > a simulation of the acoustical environment could be interesting when > compared to a live recording or IRs made with a Soundfield mic.
I believe the plan is to record the IR before the hatch is closed and the sphere pumped full of argon. Hence the need to make the measurement soon. So, simulate with air at atmospheric pressure. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
