On Sat, Apr 20, 2013 at 02:38:42PM -0700, Eric Carmichel wrote: > So I'm not always clear as to whether it's the mics' virtual > orientation in space, or the physical boundary of a spherical > surface, that *shapes* the sound and creates the requisite time > and pressure differentials.
Omni mics don't have any orientation, so its only the pyhsical shape they are mounted on that would create directivity and time differences. For a 'classic' soundfield mic it is mostly the mic's polar pattern that leads to differences between the A-format signals, except at HF where the physical size and shape of the array comes into play (which is an unwanted thing in this case). Regarding Quaudio there is some confusion (or obfuscation) going on as two things get mixed up: the mic (which apart from its small size is not really anything new), and the processing used to separate sources (which has some novel elements). Regarding the latter, in the papers it is stated that the same algorithm can be used with a standard tetrahedral mic - the required input is B-format. The separation method proposed seems to rely on long-term statistics of the intensity vector, which would mean it can't be used for e.g. moving sources. The test cases documented are for one, two or three static sources. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
