Grass Valley AMX-3981 2014 - Manual (Page 37)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 31
processing delay of the card. In this case, you have to add an extra frame delay to the video to provide more range to
the audio delay.
5.5 Miranda ALC panel
Minimizing loudness differences between segments in a
playout channel is an important issue in a world where multiple
programs originating in different formats from different sources
must be integrated seamlessly. The Automatic Loudness
Control (ALC) option is the solution to this need. It uses
Miranda’s proprietary wideband ALC algorithm.
• Identified as AMX-3981-OPT-ALC-X, where X can be 2, 6, 8 or 16 input channels. The table shows the ALC
models available:
Model Description Program types supported
AMX-3981-OPT-ALC-2 2-Channel ALC, up to 2 independent programs Mono, 2.0
AMX-3981-OPT-ALC-6 6-Channel ALC, up to 6 independent programs Mono, 2.0, 3.0, 4.0, 5.1
AMX-3981-OPT-ALC-8 8-Channel ALC, up to 8 independent programs Mono, 2.0, 3.0, 4.0, 5.1, 7.1
AMX-3981-OPT-ALC-16 16-Channel ALC, up to 8 independent programs Mono, 2.0, 3.0, 4.0, 5.1, 7.1
Note: The ALC works with PCM audio. If non-PCM audio like Dolby E or Dolby Digital and Dolby Digital Plus is fed to
the module, it will be ignored and all the program channels will be bypassed to prevent interference with the other
PCM audio channels.
5.5.1 Config tab
Channels per program
Pull-downs are available to select the number of channels
per program. Depending on the ALC model, you may have
different possible selections, from 1 to 8 channels per
program.
Input channels selection
An input shuffler allows any combination of the available
channels to be used as inputs to each ALC program.
Note: An input channel cannot be assigned to more than
one (1) program, and can only be used once within a
program.
Global Config
The Mode pull-down selects preset values for target, sliding
window and loudness units that apply to loudness
monitoring for all programs on this AMX-3981:
Mode Target
Short-Term
Time Window
Loudness
Unit
EBU R128 -23 3 sec LUFS
Figure 5.21 Miranda ALC – Config tab