I have head from guys at swedish radio that the Finland radio corporation have done a lot of Ambisonic recordings and still continued to do so.
http://labs.plan8.se/ambisonics-webplayer/ Here is a FOA binaural Web based player that you can use in chrome on most platforms. If a number of things falls into placering I hope it will support Headtracking with a bluetooth connected sensor with this year. Bo-Erik Den 9 jan. 2017 12:09 em skrev "Stefan Schreiber" <st...@mail.telepac.pt>: > Sampo Syreeni wrote: > > On 2017-01-09, Stefan Schreiber wrote: >> >> Sorry, correction: >>> >>> "I must again ask: What does "vbap" actually mean in your question?" etc. >>>> >>> >>> >> It refers to Ville Pulkki's dissertation at Aalto University (then >> Helsinki University of Technology, fi: Teknillinen korkeakoulu). >> http://lib.tkk.fi/Diss/2001/isbn9512255324/isbn9512255324.pdf >> >> Basically VBAP (vector base amplitude panning) is a form of equal power >> weighted amplitude panning. Just as your normal stereo panning law would >> be, only it's in 3D, over widely varying speaker geometry. >> > > Yes, I basically wrote the same, even linking to some Helsinki source > below dissertation level... :-) > > >> Even if the idea is rather simple, nobody for some reason did it before >> Ville, really. Definitely didn't take up the task of psychoacoustic >> evaluation of the idea. >> > > Yep. > > >> By Ville's work, it seems to work out better than expected. I wouldn't be >> surprised if the likes of Dolby Atmos actually used precisely the VBAP >> panning law in order to place their discrete sources. >> > > > Probably! Mpeg-H 3DA certainly makes heavy use of VBAP. > > >> The critique I'd have for such panning laws is that they don't really >> respect the ambisonic/Gerzon theory, especially at the low frequencies. >> > > Stereophonic panning laws are based on Blumlein's stereo theory, which in > Wittek's opinion is pretty close to sound fields anyway. > > In essence, they work, and necessarily would *have* to work in the high >> frequency, (ambisonically speaking) high order,sparse array limit. Which is >> why they mostly work for common music and speech signals. >> > > Disagreed! ILD panning leads to ITD differences at LF. (According to > Blumlein, not me.) > > http://www.hauptmikrofon.de/HW/Wittek_thesis_201207.pdf > > In contrast, Blumlein (1933) aimed at a proportional reproduction of the >> directional image of >> the recorded scene by recreating the original physical auditory cues. He >> found that in a >> stereophonic setup, the intensity5 differences between the loudspeakers >> are converted into >> phase differences at the listener’s ears below a certain limit frequency. >> Above this frequency, >> intensity differences between the loudspeakers would translate to similar >> differences between >> the ears. Thus both important cues for source localisation would be >> synthesised correctly: the >> low frequency phase differences and the high frequency intensity >> differences. >> Blumlein’s ideas are the basis of the summing localisation theory, see >> section 3.6.1. They lead >> to a computable stereophonic reproduction between the loudspeakers. He >> proposed a coincident >> microphone setup for capturing intensity differences, consisting of two >> bidirectional >> microphones at an angle of 90°, which nowadays is known as the ‘Blumlein >> pair’. >> > > > > Best, > > Stefan > > >> However, they fail to work general speaker arrays fully. Especially at >> the lower frequencies. Ambisonically speaking, where we'd go with a >> holistic, whole array, directionally averaged velocity decode. >> > > > _______________________________________________ > 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/20170109/5d154283/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.
