Hi Albert, Strictly speaking, FuMa is an extension of MAG's original B Format ordering for the Soundfield mic. and only ever went up to third order, owing to the unfortunate fact that someone many centuries ago decided that 26 letters were enough to encode English. I have always referred to the Soundfield type first order signal set (with the -3dB weighting on W) as "B Format" and used "FuMa" only when working with signals that include higher orders. However, I can see why it makes sense to refer to such first order signals as FuMa also since it explicitly indicates that they include the -3dB (and other weightings on the higher channels) to equalise maximise levels in the channels. This all made a lot of sense a couple of decades ago when most of us were still using analogue tape machines and we had to retain as much dynamic range as possible. Also having one, fixed, channel ordering helped reduce the chance of errors*. Now, I no longer think that this matters much with floating point coding eliminating dynamic range limitations and the fact labelling can (or at least, should) be part of the file itself.
Dave Malham *Labels do drop off tape reels and will always make strenuous efforts to do so at the most inconvenient possible time. :-) On 3 April 2016 at 01:20, Albert Leusink <alb...@tumbleandyaw.com> wrote: > > Hello all, > > Coming soon, to a phone near you !: > > > https://storage.googleapis.com/jump-inspector/Jump_Inspector_Quick_Start.pdf > > There will definitely be many user complaints initially due to > misunderstandings as it uses ACN/SN3D ordering and 99% of all the tools > (VST > plugins etc..) currently used by the VR community are FuMa / .AMB based... > > To add to that confusion, Oculus has just updated their Gear VR video > player > specs to accept FuMa first order.... > > I'm sure you have all had this discussion many times over, but what, if > any, > are the advantages of 1st order ACN over FuMa? > > From what I've gathered, ACN was initially proposed as it would allow > bigger > file sizes but I don't think that really applies to mobile phones in this > case...doesn't it only make sense to have ACN beyond 3rd order? > > > > Have a good weekend, > > > Albert > > > > > > _______________________________________________ > 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. > -- As of 1st October 2012, I have retired from the University. These are my own views and may or may not be shared by the University Dave Malham Honorary Fellow, Department of Music The University of York York YO10 5DD UK 'Ambisonics - Component Imaging for Audio' -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160403/1aa51ada/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.
