Nvidia Frame Synchronization User Manual page 15

• Enter a number in the Outgoing sync interval box, then click Apply.
This number represents the number of external sync pulses to receive before generating
the synchronization pulse. For example, if the house sync frequency is 120 Hz, then
entering 1 in the Outgoing sync interval box results in a 60 Hz sync pulse.
House signal
This action overrides any refresh rate that you may have selected from the refresh rate list.
Generating a Sync Frequency Faster than the External House
Signal
You can double the sync frequency by triggering the sync pulse off both the leading and
falling edge of the source sync signal. This works only with TTL level signals.
In the Sync Options section, click both the leading and falling edge check box.
House signal
This action overrides any refresh rate that you may have selected from the refresh rate list.
Detecting the Incoming Signal Type
NVIDIA Genlock supports the following external synchronization signal types:
• TTL (3.3 volt level):
• Composite Bi-level (NTSC or PAL sources use bi-level composite signals.)
• Composite Tri-level (HDTV sources commonly use tri-level composite signals.)
Normally, the software automatically detects the signal type that is being used. If
necessary, you can force the software to detect the signal type as follows:
1 Click Detect to force detection of the signal type.
The software tests each signal type and stops when it detects a match.
2 If the signal type cannot be detected, click the Incoming sync type list box arrow and
then click the item corresponding to the signal source.
Click Composite Auto-Detect if you want the frame lock board to classify the signal as
bi-level or tri-level.
3 Click Apply to activate the changes.
NVIDIA Corporation
Frame Synchronization User's Guide – Version 3.0
Sync Pulse
Outgoing Sync Interval value of 1
Sync Pulse
Outgoing Sync triggered from leading and falling edge
NVIDIA Frame Synchronization
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HAPTER
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