13 May
2004
13 May
'04
1:13 p.m.
When you set the channel count >2 do the output channels have
a specific spatial positioning defined? Or would it make more
sense to output B-format and run it through one of the Ambisonics
plugins to get a specific speaker layout?
jlc
13 May
13 May
1:23 p.m.
On Thu, May 13, 2004 at 11:06:11AM -0400, Jesse Chappell wrote:
When you set the channel count >2 do the output
channels have
a specific spatial positioning defined? Or would it make more
sense to output B-format and run it through one of the Ambisonics
plugins to get a specific speaker layout?
-B gives you ambisoncs B-format out (W,X,Y,Z). I'm not so sure about
the ambisonics plugins, some that I tested (long ago) did not give the
correct outputs.
-C 2 is for a square layout LF, RF, LB, RB
-C 4 is for a cube layout bottom square (as above) followed by top square.
Future versions may have a more flexible decoder built-in, or I could
supply a separate (JACKified) decoder.
--
Fons
1:30 p.m.
On Thu, May 13, 2004 at 05:14:54PM +0200, Alfons Adriaensen wrote:
-C 2 is for a square layout LF, RF, LB, RB
-C 4 is for a cube layout bottom square (as above) followed by top square.
This should of course be
-C 4 is for a square layout LF, RF, LB, RB
-C 8 is for a cube layout bottom square (as above) followed by top square.
^
|
--
Fons
1:47 p.m.
Alfons Adriaensen wrote on Thu, 13-May-2004:
On Thu, May 13, 2004 at 11:06:11AM -0400, Jesse
Chappell wrote:
I assume you meant 4 and 8 respectively. What about 3?
Incidentally, I notice that in 0.1.0 that when you specify values 5-7 it segfaults,
and 8 causes jackd to hang up entirely on my system.
I tried the quad layout last night and it sounded good, how have
you defined the spatial sense of the surround outputs? Where
do you place the virtual listener, and are the rear channels providing
mostly non-direct generated from the reverb? Is more of the direct sound
in front of the listener? It was hard to tell in my smallish
room.
jlc
When you set the channel count >2 do the
output channels have
a specific spatial positioning defined? Or would it make more
sense to output B-format and run it through one of the Ambisonics
plugins to get a specific speaker layout?
-B gives you ambisoncs B-format out (W,X,Y,Z). I'm not so sure about
the ambisonics plugins, some that I tested (long ago) did not give the
correct outputs.
-C 2 is for a square layout LF, RF, LB, RB
-C 4 is for a cube layout bottom square (as above) followed by top square. 
7:20 p.m.
On Thu, May 13, 2004 at 11:39:27AM -0400, Jesse Chappell wrote:
I assume you meant 4 and 8 respectively. What about
3?
Yes, of course.
Incidentally, I notice that in 0.1.0 that when you
specify values 5-7 it segfaults,
and 8 causes jackd to hang up entirely on my system.
Shame on me. I corrected that bug while in Karlsruhe, but didn't take
the corrected source back home.
In audio.h, lines 86 and 87, change 4 to 8...
(hides under table)
The 8 channel ouput was added just a few hours before leaving for
the conference, and was never tested with JACK.
-C 3 will be the same as -C 2, and 5,6,7 the same a 4.
I tried the quad layout last night and it sounded
good, how have
you defined the spatial sense of the surround outputs? Where
do you place the virtual listener, and are the rear channels providing
mostly non-direct generated from the reverb? Is more of the direct sound
in front of the listener? It was hard to tell in my smallish
room.
ATM, all four divisions are in front, and the rear channels are mostly
reverb. As to the place of the listener, this depends largely on the
setting of the audio controls. Ambisonics encodes direction only, and
distance has to be suggested by early reflections and reverb.
The default setting are sort of a compromise. If you reduce the width
and maybe increase the reverb a bit, you will have a sound as for a
listener that is somewhere in the middle of the church. With much less
reverb, it's more like sitting at the organ console. I plan to add
controls that will enable you to place a division in the back, as is
often the case when sitting at the keyboards, or in one of the sides.
--
Fons
7290
days inactive
7290
days old
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participants (3)
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Alfons Adriaensen -
Fons Adriaensen -
Jesse Chappell