On 02/16/2012 09:59 PM, Iain Mott wrote:
On Thu, 2012-02-16 at 20:34 +0000, Fons Adriaensen wrote:
On Thu, Feb 16, 2012 at 06:22:15PM -0200, Iain Mott wrote:
To clarify, for a 6-speaker 2d array - ambdec can decode at maximum, the
following inputs (3rd order horizontal, 0 order height): W X Y U V P Q ?
Yes, but it doesn't make sense doing so. With six speakers you can't
reproduce 3rd order correctly - 2nd is the limit.
Ciao,
that's a shame - i've only got two speakers to monitor with presently -
but strange, 3rd order seemed to be a sharper image than with the 2nd
order - wishful thinking perhaps.
well, you can use 3rd order hypercardioids to drive six speakers, and
indeed channel separation will improve, which results in less phasiness
and more pleasant diffuse-field sound.
but the soundfield will no longer be homogeneous - a phantom source
between two speakers will be softer than one on a speaker. the sound
field will be pretty garbled.
Would you recommend then for 6 speakers, 2nd order ambisonic for the
simulated room reflections (and jconvolver tail reverb) and
vector-panning (vbap) for the direct?
you mentioned moving sources - for those, i would advise against vbap,
because the timbre and apparent source width will shift a lot as the
source moves. otoh, if you have static sources, vbap for direct sound
could outperform 2nd order ambi.
personally, i wouldn't bother with such a hybrid system, but there may
be good reasons to do it.
one i could think of is when you have signal sets which are sensitive to
crosstalk, say an a/b stereo set. it will always sound nicer when routed
discretely to a pair of speakers than as two second-order ambisonic
phantom sources panned 60° apart....
best,
jörn
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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