Grass Valley AMX-3981 2014 - Manual (Page 40)

GUIDE TO INSTALLATION AND OPERATION
34 | AMX-3981
Response Time
Outside of the Fast and Transient modes ranges, the ALC performs loudness correction slowly, following the
Response Time. Response time values are : 5 sec, 10 sec, 15 sec, 20 sec, 30 sec, 45 sec, 1 min, 5 min, 10 min, 15
min, 20 min.
Freeze Threshold
The Freeze Threshold sets the threshold below which the ALC will not increase loudness This prevents quiet
portions of programs (and noise) from being unintentionally boosted. If the input program loudness is under the
Freeze Threshold for more than 30 seconds, the ALC will smoothly return to 0 dB of loudness correction.
Limiter Threshold
The Limiter Threshold will limit the output loudness under the selected threshold. This avoids unintentional clipping
of loud portions of programs. If the input program loudness is over the Limiter Threshold, the ALC will reduce the
loudness very quickly, in 1 millisecond.
5.6 Dynamic Processing panel
This panel provides controls for dynamic processing of the
audio passing through the AMX-3981
• The Dynamic Processing Option (AMX-3981-OPT–DP)
must be activated to access this functionality. See
page 64.
Individual and independent controls are provided for each of
the 32 channels.
These parameters affect the output audio channels (HD/SD
embedded and AES), and the audio channels assigned to
the Dolby E encoder and the Dolby Digital and Dolby Digital
Plus encoder modules.
Note that, unlike the audio processing configuration, only
one (1) dynamic processing configuration is saved by the
card, regardless of the input format (3G/HD or SD).
• Access the individual channel controls through 4
master tabs and sub-tabs
The functionality of these controls is identical for each
channel, and is explained here.
The upper right-hand corner of each tab contains a graphic
depicting the transfer characteristic of the channel as
configured by the current dynamic processing settings.
Images will be shown below to illustrate the effect of the various controls
Mode
Use the pulldown to select the operating mode for this channel, from among these options:
• Mono:
applies the dynamics processing settings only to the selected channel
• Stereo: applies the dynamics processing settings to the channel pair (e.g. 1 & 2, 7 & 8, etc.)
• Group 1: applies the dynamics processing settings only to the channel assigned to Group 1
• Group 2. applies the dynamics processing settings only to the channel assigned to Group 2
Figure 5.23 Dynamic Processing panel