Greetings to All, Just a few thoughts regarding recent posts and the argon-filled sphere. Martin, I definitely boo-booed by suggesting the recording would be made in an all-argon atmosphere. But comparing the *sound* one might experience between the two conditions (air vs argon) might have been interesting. I learned to scuba while in the military--this was during the Gulf War/Desert Storm. Most of what I learned regarding Boyle's law, Charles's law, and partial pressures came from two classroom lectures (this was prior to embarking on a college degree). Anyway, I don't believe breathing noble gases for a brief period and under normal atmospheric conditions would result in much more than momentary oxygen deprivation. The use of gas mixtures under immense pressure (deep sea diving) is a wholly different thing. Divers learn to ascend at rates that permit off-gassing and pressure equalization at the physiological level--it all relates to gases under pressure and dissolving in liquid (in this case, blood). What is far worse at normal pressures are gases (particularly CO) that attach themselves to the blood in the same manner as oxygen. A lot of people don't realize that CO is one of the deadliest gases there is, even in dilute concentration. Helium and Argon don't chemically attach to much of anything (hence their categorization as noble gases). On another extreme, climbers (K2, Everest, etc.) need time to acclimate to low atmospheric pressure (this goes far beyond oxygen needs). Without proper adjustment, extreme elevation changes can result in severe sickness or worse. Anybody up for making IRs in the Himalayas?
If someone wished to do hyper-real sound design for sci-fi movies, he/she would have to consider how we might sound and hear in alien atmospheres. But I guess Captain Kirk wouldn't have appeared too manly had he started talking like Mickey Mouse while in a rarified environment. Actually, the ideas of echoes and sound on distant planets might be of value... one of these years. Lastly, I was happy to read Richard Lee's comments regarding the TetraMic and using it as a sound intensity probe. Never thought of using the TetraMic for this. Thanks, Richard, for the insights (and the many contributions you've made). I used to have a pair of matched B&K 1/4-inch mics that were for an intensity probe. The B&K mics were matched for phase as well as frequency response. Do the IRs included with the TetraMic compensate for phase changes as well as frequency response variations? Judging by the math (only a part of which I understand), I imagine they do. Best, Eric C. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130209/3cb4c793/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
