On Mon, Jan 09, 2017 at 06:27:15AM +0200, Sampo Syreeni wrote:

> 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.

VBAP is the 3D form of pairwise panning, and has the same problems.

> 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.
 
Pairwise panning or VBAP vs. Ambisonics is just like linear
interpolation vs. constant-bandwidht (sinc) interpolation. 

As the number of speakers / AMB order increases, the difference
between VBAP and in-phase or max rE decoding becomes smaller.
But not for LF where you'd use systematic decoding when using AMB.

Ciao,

-- 
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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