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.
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.
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.
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.
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.
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.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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