IQUDC30/IQUDC31/IQUDC32/IQUDC33
Operation Using the RollCall Control Panel
Issue 1 Rev 4
Page 74
© 2016 SAM
5.9.3 Delay
The Delay controls enable you to set delay pair offsets and the audio delay relative to the
video delay.
5.9.3.1
Tracking Audio Delay (where fitted*)
The module measures video delay input to output, and automatically compensates the audio
via precision sample rate conversion. In this way, AV delay error is reduced to less than 2 ms.
This is ideal for content where AV timing is critical e.g. lip sync (talking heads and musical
events), and removes the need for manual adjustment. However, user adjustable audio delay
(global and pairwise) is still additionally available, to compensate for up/down stream audio
timing errors.
5.9.3.2
Global Delay
The Global Delay control shows the total video and audio delay for the current video
conversion. The preset value for audio delay is the same as total video delay, in order that the
two should be co-timed.
•
Audio:
Adjusts the audio delay relative to the video delay. The slider controls all eight
audio output pairs as a bulk group. The adjustment range is -40 ms to 200 ms in 1 ms
steps. The preset value is 0 ms.
This is actually an offset to the total video delay. The preset value of 0 ms means that
audio delay matches video. Moving the slider to -10 ms, means all eight output
channels will be 10 ms earlier than the video at the output.
The total global audio delay is displayed in the Total box: total global audio delay =
(total video delay + global audio delay).
•
Video:
The Total box shows the current total video delay.
5.9.3.3
Global Delay Pair Offsets
In addition to the Global Delay controls, eight separate controls enable you to adjust each
audio output pair individually. Each slider applies an additional delay to the pair, which is
offset from the audio global delay.
•
Pair 1–8:
Adjusts the audio delay offset for each of the eight audio output pairs. The
adjustment range is -40 ms to 200 ms in 1 ms steps. The preset value is 0 ms.
The total global audio delay pair offset is displayed in the Total box: total global audio
delay pair offset = (total video delay + global audio delay + pair offset).
Note:
*Tracking Audio Delay is not available in modules which were upgraded to V5.2.7 or above
after installation. Only new builds of modules at version 5.2.7 and above will have tracking
audio delay.
Note:
Global delay is applied to all channels. Individual channel delays are added/subtracted
from this delay.
