This is an especially annoying problem when you consider hi frequencies are what we localise best
On Thu, 22 Oct 2020 at 12:37, jack reynolds <jackreynolds...@gmail.com> wrote: > The only problem with using ambisonics mics is the high frequency limit > above which they stop working properly. A second order ambi mic reduces > this problem, but above about 7Khz the not quite coincident capsules > becomes a problem. > > J > > On Thu, 22 Oct 2020 at 11:36, Steven Boardman <boardroomout...@gmail.com> > wrote: > > > > > > What makes you think that ORTF captures > > > 'a small 8th of a sphere' ?? > > > > I don’t.. > > > > Maybe I wasn’t clear. What I meant was replacing each ORTF capsule (or > M/S > > pair) with an ambisonic mic, and decoding for the direction it should > point. > > All spaced array setups can use ambisonic mics, as they can output all > the > > polar patterns required. > > My point was; the polar patterns would be more accurate (for a calibrated > > mic) and hence the spatial accuracy better. > > So yes exactly that. > > > > Thanks for making it clearer :) > > > > Steve > > > > > > > > Sorry, this doesn't make any sense... A decoder doesn't give 'spherical > > > coordinates', it outputs signals. What makes you think that ORTF > captures > > > 'a small 8th of a sphere' ?? > > > > > > Each Ambisonic mic, by suitable combination of its capsule signals [1], > > > can provide the same signals as any number of conventional capsules > > > (omni, cardioid, fig-of-eight,...) placed at the same point in space > > > and in any direction. > > > > > > So you can always replace every group of (nearly) coincident > conventional > > > capsules (e.g. an M/S pair) by an Ambisonic one and get exactly the > same > > > signals. > > > > > > If you use a higher order AMB mic (e.g. an OctoMic) you can even get > > > polar patterns for which no conventional capsule equivalent exists, and > > > which certainly provide an advantage for surround. > > > > > > That's all there is to it. > > > > > > > > > [1] This involves some filtering as well as just summing/subtracting > > > signals, and for good reults it requires calibration of the AMB mic's > > > capsules. If you experimented with Ambisonics in the way you pointed > > > out, it's no surprise you got bad results. > > > > > > As I've stated a number of times before, there is *a lot* of completely > > > bogus information on Ambisonics technology floating around. Some of > this > > > stuff is at the same level of intellectual integrity as e.g. flat-earth > > > theories. Most of it is just the results of failing to understand basic > > > things, or of simplifying things to the point that whatever remains is > > > 'not even wrong'. Combine that with some people having their own > agenda. > > > > > > Ciao, > > > > > > -- > > > FA > > > > > > _______________________________________________ > > > 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. > > > > _______________________________________________ > > 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. > > > > > -- > > 07889727365 > > 02036861372 > > 3 Swimmers Lane > Haggerston > London > E2 8FR > > > www.facebook.com/reynoldsmicrophones > > www.sohovr.co.uk > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20201022/7b073c79/attachment.htm > > > _______________________________________________ > 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. > -- Artist website: www.augustineleudar.com Business website: www.magikdoor.net -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20201022/3854d48b/attachment.htm> _______________________________________________ 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.
