Grass Valley 3DX-3901 - Manual (Page 17)

GUIDE TO INSTALLATION AND OPERATION
3DX-3901 | 13
Input/Output Config tab
The Input Config pulldowns allow the user to select between sources (both electrical and optical if available) for
inputs 1 and 2.
It must be noted that the auxiliary output is not available when a fiber module is used, as there is not room for
both connectors on the rear panel.
The Fiber Output Config pulldowns allow the selection of outputs on the fiber optic channels, if available. The
choices are OFF, LEFT, RIGHT and AUX. Unavailable choices are shown in red.
Optic Fiber Module: The Detected text box shows the type of fiber optic module installed in the rear panel, if any.
Deglitcher tab
When the Deglitcher is ON, the card supports a hot-switch
between two signals on the same input 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.
Mode: select OFF or ON from the pulldown.
• Note that the Deglitcher cannot be enabled for
1080p23, 1080p23sF, 1080p25 and 1080p29
sources
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 1 line apart, we will see a vertical jump 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.
There may also be problems in the transition when in the AFD automatic or forced mode.
When a reference is present and the deglitcher is active, the card reports the difference in timing between the input
and the reference when the transition occurs.
• If the reference is missing when the deglitcher is activated, the Input timing to reference box will indicate
“Missing reference” in red, and the reference status icon at the top of the iControl window will turn red and
show the message “Reference missing”.
• If the deglitcher is OFF, the reference status icon will be grey, and its message will read “Reference absent”
Figure 3.5 Input / Output - Deglitcher tab