Grass Valley AMX-3981 2014 - Manual (Page 87)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 81
The figure below shows some of the most popular operating modes for the 5.1 ALC.
AeroMAX tm
LFE
Rs
Ls
L
R
C
LFE
Rs
Ls
L
R
C ALC
5.1/2.0
PGM 1
AeroMAX tm
L
R
L
R
ALC
2.0
PGM 1
AeroMAX tm
LFE
Rs
Ls
L
R
C
LFE
Rs
Ls
L
R
C ALC
5.1
PGM 1
Modules with a –DUP feature the optional upMAX
TM
upmixer function licensed by Linear Acoustic. This processing
creates a 5.1 channel surround field (Left, Right, Center, LFE, Left-Surround, Right-Surround) from a 2.0 channel
stereo input (Left, Right). It is the same technology used on the MOD-LA-DUP-701 module. The figure below shows
some typical configurations of the ALC equipped with the upmixer. The two pictures on the right show the upMAX
TM
in
AutoMAX-II
TM
mode, where the configuration switches automatically between 2.0 and 5.1.
AeroMAX tm
L
R
LFE
Rs
Ls
L
R
C
A
L
C
2.0
U
P
M
I
X
PGM 1
UPMAX tm AeroMAX tm
LFE
Rs
Ls
L
R
C
LFE
Rs
Ls
L
R
C
A
L
C
5.1
/
2.0
U
P
M
I
X
PGM 1
UPMAX tm
Auto
LFE
Rs
Ls
L
R
C
LFE
Rs
Ls
L
R
C
A
L
C
5.1
/
2.0
P
A
S
S
PGM 1
AeroMAX tm UPMAX tm
Auto
Note: The MOD-LA-ALC-X-YYY works with PCM audio. If non-PCM audio like Dolby E or Dolby Digital is fed to the
module, it will be ignored and silenced to prevent interference with the other PCM audio channels.
Latency
The MOD-LA-ALC module processing latency is automatically compensated (to avoid lip-sync issues) when the
additional video frame delay (Timing tab) is set to at least one (1) frame.
6.5.1 Config tab
The ALC PGM x Mode pulldowns specify the channel configuration
for Program 1 & 2 (PGM 1 & 2). Depending on the ALC model, you
may have different possible selections like 5.1, 2.0 or 5.1/2.0. This
will indicate in which configuration you want to operate the module. If
you want to do ALC on a stereo channel, select 2.0. For 5.1 input,
select 5.1. The 5.1/2.0 configuration should be used when you have
both 5.1 and 2.0 inputs, but you want to do an upmix on the 2.0
input, hence producing a constant 5.1 output. To upmix a mono
channel, use the 2.0 configuration and assign both inputs to the
desired mono channel.
If you have an ALC module with the –DUP upmix functionality, you
can also configure the Upmix PGM 1 Mode.
If you set the ALC to work in 2.0 or 5.1/2.0 mode, the pull-down box
offers four different processing solutions:
Pass Mode
Input channels are passed from the input to the output untouched.
Figure 6.9 LA-ALC-DUP - Config tab