GUIDE TO INSTALLATION AND OPERATION
98
| XVP-3901
ALC Bypass
Checking this box bypasses the ALC program processing, and the input channels pass-through the output unaltered.
Target Loudness
Sets the target output loudness. This value sets the
average
output loudness, which means that due to the program
dynamics, the output loudness will move around the selected target. With the ALC filter set to
None
, the target output
loudness ranges from -10 dBFS to -31 dBFS. With the ALC filter set to ITU-R BS.1770, the target output loudness
ranges from -10 LKFS to -31 LKFS.
Here’s the time-domain response of the ALC:
ALC Pre-Amp Level
A pre-amp stage is available in front of the ALC to compensate for programs having an input loudness out of the ALC
tracking range (very low or very high input loudness). The pre-amp level ranges from -20 dB to + 20 dB, in steps of 1
dB.
Fast Mode Response
The
Fast Mode Response
is optional and is enabled by checking the
Enable
box.
The ALC
Fast Mode Response
kicks in whenever the input loudness goes over the
Fast Mode Threshold
and
loudness is reduced, in a few milliseconds. The
Fast Mode Threshold
is given in dB with respect to the target
loudness and ranges from 2 to 12 dB, in dB steps.
Transient Mode Response
The
Transient Mode Response
is optional and is enabled by checking the
Enable
box.
The ALC
Transient Mode Response
kicks in whenever the input loudness goes over or under the
Transient Mode
Threshold
. The
Transient Mode Threshold
is symmetric with respect to the target loudness and ranges from 2 to 12
dB, in dB steps. When the input loudness is over the
Transient Mode Threshold
, loudness is reduced following the
rate set by the
Speed
pull-down. When the input loudness is under the
Transient Mode Threshold
, loudness is
increased, again following the
Speed
pull-down, which ranges from Slow (up to 15 seconds) to Fast (up to 4
seconds).