On Sat, Feb 09, 2013 at 03:59:12PM +0000, Stefan Schreiber wrote:
> I repeat my question, now on this list:
>
> Isn't 2nd (vertical) order enough for this configuration, in both
> cases? (full-spherical/half-spherical)
That configuration can do full 3rd order, and of course any subset.
But the question is usually the inverse one: which speaker configuration
do you need for a given combination of H and V orders. For 3,2 it depends
on what you actually want: 3h2v or 3h2p.
3h2v is full 3D with third order horizontally and second order in
elevation. It uses and reproduces the following components (all
except K):
W
Y Z X
V T R S U
Q O M * L N P
This maintains 3rd order horizontal resolution at all elevations and
2nd order elvation at all azimuths. It requires 6 speakers at +/- 45
degrees to reproduce O and N which are 2nd order horizontally.
An alternative is 3h1v:
W
Y Z X
V T * S U
Q O * * * N P
which provides only first order resolution in elevation, which requires
the same number of speakers but 3 less ambisonic channels to transmit.
3h2p is the superposition of a horizontal-only 3rd order system and
a 2nd order periphonic one, using:
W
Y Z X
V T R S U
Q * * * * * P
This could be done with 4 speakers in the up/down rings, as
there is only first order information there, T and S.
Such a system could be used to reproduce essentially horizontal
content at 3rd order, with 2nd order ambience. In that case you
could also consider 3h1p, requiring 3 less channels but probably
almost the same number of speakers:
W
Y Z X
V * * * U
Q * * * * * P
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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