Grass Valley AMX-3981 2014 - Manual (Page 54)

GUIDE TO INSTALLATION AND OPERATION
48 | AMX-3981
5.10 Loudness Panel
Note: In order to use the loudness measurement capabilities of the AMX-3981, the Loudness Option must be
installed. See Loudness Measurement option on page 65 for details.
The AMX-3981 allows the user to measure the loudness of audio streams passing through it. The measurement
process is flexible:
• All major loudness standards are supported.
• The measurement standards can be customized if desired.
• Up to four programs can be measured at once.
• Each program can be selected from an internal AMX-3981 metadata path, or defined manually.
• Segment markers can be inserted from a variety of triggers.
• Log files of the measurements can be stored externally, for analysis using Miranda’s Audio Loudness Analyzer.
5.10.1 Loudness | Config panel
Global Config
All loudness measurements performed by this AMX-3981
conform to the same standard, which is selected here using
the Meter Mode pulldown.
Six options are available:
Standard Target
Short-Term
Time Window
Relative
Gating
Loudness
Unit
EBU R128-2010 -23 3 sec -8 dB LUFS
EBU R128-2011 -23 3 sec -10 dB LUFS
A85 ITU BS.1770.1 -24 10 sec N/A LKFS
A85 ITU BS.1770.2 -24 10 sec -10 dB LKFS
ARIB TR-B32 -24 3 sec -10 dB LKFS
Custom -31 to -1 1 to 15 sec -8, -10, N/A LKFS
For the 5 defined standards, the other three pulldowns are
inactive, but display their preset values in gray.
If Custom is selected, the other three pulldowns are active,
and values can be chosen according to the user’s needs.
The range of available values is shown in the chart.
Global Control
The AMX-3981 can monitor loudness on up to four programs specified by the user.
• In this panel, select which programs will be active using the PGM 1 to PGM 4 checkboxes.
• The tabs for the selected programs will become active, allowing each program to be defined.
Figure 5.41 Loudness panel – Config tab