Ricky Graham <ri...@rickygraham.net> wrote:
Does anyone have any experience recording B-Format with multiple microphones set to specific polar patterns (i.e. if you don’t have access to an ambisonic / tetramic?). Is it possible? If so, what are some of the issues / problems with this approach? ******************************************************************************************************************* Along with Thomas Chen, I wrote two AES papers on this subject, "The Native B-format Microphone" parts I and II. The abstracts can be seen here: http://www.aes.org/e-lib/browse.cfm?elib=13348 http://www.aes.org/e-lib/browse.cfm?elib=13444 The gist of the papers is, as you say, how to record B-format if you don't have a soundfield microphone. Aside from getting the microphones as close together as physically possible, it's important to do some post-processing to make the frequency responses of the various microphones more alike than they naturally are. Most figure eight condenser microphones roll off in the bass at about 150 Hz. Most omni microphones make it down to 20 Hz or lower. You can either boost the bass on the Fig 8s or roll-off the bass on the omnis. We used two systems. One of them was comprised of lavaliere microphones (or hearing aid microphones) and the other was two Schoeps Mk8s and an Mk2. One idea that we didn't try is that perhaps the omni (W) should be facing upwards. Omnidirectional microphones, even very good ones like the Schoeps, are really not very omni. So facing the microphone upwards guarantees that the response will be the same in every direction in the horizontal plane. The front-back (X) microphone can be placed above the omni, facing downwards. That leaves the left-right (Y) microphone to be placed elsewhere. There are no perfect solutions here! If you would like copies of the two papers, just let me know. I haven't looked at them since we wrote them, but I don't think that we told any lies! Eric Benjamin -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20150305/efef2f52/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
