GUIDE TO INSTALLATION AND OPERATION
XVP-3901 |
83
Limiter Threshold
The
Limiter Threshold
will limit the output loudness under the selected threshold. This prevents loud portions of
programs from being unintentionally clipped. If the input program loudness is over the
Limiter Threshold
, the ALC
will reduce the loudness very quickly, in 1 millisecond.
5.12 Loudness Panel
Note: In order to use the loudness measurement capabilities of the XVP-3901, the Loudness Option must be
installed. See Loudness Measurement option: on page 103 for details.
The XVP-3901 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 XVP-3901 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.
5.12.1 Loudness | Config panel
Global Config
All loudness measurements performed by this XVP-3901
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 XVP-3901 can monitor loudness on up to four programs specified by the user.
Figure 5.70 Loudness panel – Config tab