The advantage of ACN is that it is a natural ordering of the HOA channels described with a single number q=n^2+n+m+1 (with n the order and m the degree), and it is aligned with pretty much any other field using spherical spectral analysis (graphics, signal processing, physics, etc...) , making transfer of knowledge from these fields to ambisonics much less confusing.
About ACN, if you are working on the more theoretical side of ambisonics, it is the only normalization that makes sense again since it keeps the spherical harmonics orthonormal and it simplifies most things on paper a lot! It can just as well be kept as a standard, however conversion to other normalizations (such as SN3D) are just a gain factor per order and very easy to do. Regards, Archontis On 03 Apr 2016, at 10:51, Xavier Bonjour <x.bonj...@3dsoundlabs.com<mailto:x.bonj...@3dsoundlabs.com>> wrote: Hello, And to add one more level of confusion, MPEG-H 3D Audio has gone for ACN/N3D normalization! Going beyond 3rd order is also going for better quality and it makes sense for the following reasons: - Recording technologies make progress: we should expect multicapsules microphone technology to improve and go beyond 3rd Order - 3D sound can also be computer generated to any order and there is a significant perceptual difference between the binaural rendering of 3rd order content and content of higher orders. And this difference is even bigger when HRTF are personalized - Compression (MPEG-H 3D Audio, ...) will make HOA content manageable, even on a smartphone. I guess defining a normalization that covers HOA beyond 3rd order is about getting the "format" ready for the future development. Kind regards -Xavier -----Original Message----- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Albert Leusink Sent: dimanche 3 avril 2016 02:20 To: sursound@music.vt.edu<mailto:sursound@music.vt.edu> Subject: [Sursound] Ambisonics for Android and also Oculus.. Hello all, Coming soon, to a phone near you !: https://storage.googleapis.com/jump-inspector/Jump_Inspector_Quick_Start.p df 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. _______________________________________________ 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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160403/1fb816d8/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.
