Grass Valley AMX-3981 2014 - Manual (Page 25)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 19
Horizontal (µsec): With this adjustment, a value ranging from zero to the equivalent of 1 horizontal line in the current
operating format compared to the reference or the frame boundary may be set.
Frame Delay (Frames): This parameter affects the overall processing delay of the card. It adds supplemental frame
delay to the current processing delay. This parameter will add a delay ranging from 1 to 15 interlaced frames (steps of
33 ms in 59.94 Hz and 40 ms in 50 Hz) to the current processing delay. Without a reference, the normal processing
delay is 1 frame. You can extend this delay up to16 frames using this slider. With a reference, up to 15 frames can be
added to the frame sync delay which depends on the timings between the input and the reference.
Note that, in order to compensate for the processing delay of a Dolby E and Dolby Digital decoder or a Dolby E
encoder installed on the AMX-3981 card, the frame delay must be set to at least one (1) frame. On the other hand, if
a Dolby Digital and Dolby Digital Plus encoder is installed, the frame delay must be set to at least seven (7) frames for
59.94 Hz formats and at least six (6) frames for 50 Hz formats.
Minimum Delay Mode
The minimum delay mode minimizes the processing delay of the video. The audio processing delay varies depending
on the presence of options. The following charts show the processing delay of audio and video for different video
formats and options.
Video Processing Delay:
SD: 20 µs
HD: 7.5 µs
3G – Level A: 3.8 µs
3G – Level B: 4 Lines + 4 µs
Audio Processing delay:
ALC DP Delay Delay using AES In
3G/HD/SD No No 2 ms 4 ms
3G/HD/SD No Yes 3 ms 5 ms
3G/HD/SD Yes No 3 ms 5 ms
3G/HD/SD Yes Yes 4 ms 6 ms
Note that using the AES inputs adds 2 ms to the delay, as shown in the table
Note: When minimum delay is active the following features will be disabled: AFD auto mode, frame buffer, A/V
deglitcher, freeze functions and DOLBY E alignment.
Enable the Minimum Delay checkbox to place the AMX-3981 in this mode. A pop-up warning will appear, explaining
the implications of using this mode: