GRASS VALLEY XIP-3901, User Manual

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Configuring the XIP - 3901 - UC / -DC / -FS Applications with iControl
Deglitcher Tab
Deglitcher Tab
For each processing channel, select the appropriate deglitcher mode (ON or OFF) using the
pulldown menu.
Figure 7-5:
Deglitcher Tab
When the deglitcher is enabled, the card supports a hotswitch between upstream signals
without producing a freeze on the frame sync, and without producing artifacts on the
output.
The deglitcher must be disabled when the input is asynchronous to the reference.
Otherwise, it will create audio and video glitches at the output.
For this mode to function correctly, the following requirements must be met:
• The two inputs must be synchronized to the reference
• They must be phased within one line of each other
• They must be phased to within ± ½ line of the HREF of the reference signal
The offset from the VREF can be variable, but a distance of greater than 10 lines could
create an artifact in the active video. If the two signals are more than one line apart, a
vertical jump will occur at the moment of switching that is proportional to the number of
vertical lines of offset between the two signals. This will last for only one frame. For more
information about using clean switch regions to perform glitch-free switches, see Clean
Switch Regions and Examples , on page 99.
The Input Timing to Reference box reports any difference in timing between the input and
reference when the transition occurs. When the deglitcher is disabled, it will display
“Deglitcher Disabled”. When the deglitcher is enabled, it can display one of the following
error messages in red: