Grass Valley AMX-3981 2014 - Manual (Page 84)

GUIDE TO INSTALLATION AND OPERATION
78 | AMX-3981
6.4 Upmixing using Linear Acoustic Technology upMAX
TM
• Identified as MOD-LA-DUP-701 on the module tab.
This optional module integrates the 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)
The Config - Mode pull-down box offers four different
processing solutions:
Pass Mode
Select the input channels to the L, R, C, LFE, Ls and Rs
inputs with the pull-down menus. These channels are passed
through unaltered and are assigned to the output channels
selected using the Output Channels pulldown
Upmix Mode
Select the input channel pair to the L/R inputs with the pull-
down menu. The resulting 5.1 channels are assigned to the
output channels selected using the Output Channels
pulldown.
AutoMAX-II
TM
Mode
Select the input channel pair to the L/R inputs with the pull-
down menu. The resulting 5.1 channels are assigned to the
output channels selected using the Output Channels
pulldown. Additionally the channels selected at the C, LFE, Ls and Rs inputs are summed with the outputs of the
upmixing process.
This mode also allows a 5.1 audio present at the input to pass through. It will auto switch between a stereo and a 5.1
audio source to provide a 5.1 output at all times.
• Set up the transition between the two modes to be unobtrusive by selecting transition speeds for each case –
upmix-to-pass and pass-to-upmix – using the two AutoMAX-II Transition Speed pulldowns
• Use the 5.1/2.0 Detection Threshold slider to set the level at which some 5.1 channels are considered to be
silent, identifying the input as 2.0
Note: The AutoMAX-II
TM
algorithm is supported by firmware version 1.3.1.0 and later. Firmware version 1.3.0.0
supports only the AutoMAX-I
TM
algorithm. The AutoMAX-I
TM
algorithm does not support the upmix-to-pass
and pass-to-upmix transition speeds.
Follow Metadata mode
This mode may be useful for sources that switch between stereo and 5.1. The Coding Mode parameter in the first
program of the Dolby metadata will set the Operating Mode between Pass and Upmix modes.
Note: In Follow Metadata mode, the metadata generator will be automatically turned ON when the upMAX
TM
module is upmixing to provide a valid metadata stream for the upmixed audio content. The generator content
must have been previously configured with valid 5.1 metadata parameters. When the upMAX
TM
module is set
to Pass mode by the incoming metadata stream, the generator will be automatically turned OFF to let the
incoming metadata stream pass through. Refer to Generator Automated mode in the Dolby metadata panel
section for further details.
Figure 6.7 Audio Modules - Linear Acoustic UpMAX