[PD] multi-speaker panning.. problamtic maths
derek at x-i.net
Mon Oct 23 21:10:27 CEST 2006
Georg Holzmann wrote:
> I would suggest you to use the vbap (vector based amplitude panning)
> external, which does exactly what you are trying to achive ...
The VBAP objects are great, except for one thing that is inherent in all
vector-based systems: try to pan a sound directly from left to right
through the middle of the loudspeaker circle you have defined. At a
certain point (exactly the middle), the sound will audibly "flip over"
from one side of the sound field to the other. This is a result of
making a radical shift in the radiant of this circle, which is the basis
for all measurements in a vector-based panning system.
For four-channel panning, at least, I've been much more satisfied with a
quad-panning system based on a chain of stereo panners, going from
front/back to front:left/right and back:left/right. For a four channel
system, and when you want the sound to move within the bounds of the
phsyical speaker locations (as opposed to using a direct sound vs.
reverberated sound system to simulate sounds outside the bounds of the
speaker locations), this has given the best results for me. Otherwise,
I'd love to see a better implementation of VBAP that accounts for this
"hole in the middle" problem.
derek holzer ::: http://www.umatic.nl
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'Remember .those quiet evenings'
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