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6.3.4. Selecting the 3:2 Pulldown Reference with 1080p/23.98sF Input Video
This menu setting is only used when the input video is 1080p/23.98sF. In other
input video formats it is not applicable
Video
Pulldown Reference
Auto
RP 188 (*)
6 Hz Input
Free Run
*
This function is not yet implemented
On 1080p/23.98sF video inputs the Pulldown Reference menu is used to
identify the input frame that will become an A frame at the output. This
frame is called the A frame candidate (see Figure 6-1). The output of the A
frame candidate frame will be delayed by 2 frames, will consist of two video
fields and will normally be in time with the genlock input. (See sections
6.3.1 and 6.3.15 for information on phasing of the output video with respect
to the genlock.)
Additionally, an offset can be added to the A Frame
reference using the A Frame Offset control to accommodate situations
where the A frames are not in time with the A Frame reference. (See
section 6.3.5)
When you select Auto the card will auto detect the pulldown reference
according to the following priority:
•
6 Hz pulse if present
•
RP188 ancillary timecode if present (feature not implemented yet)
•
Free Run pulldown if neither 6 Hz pulse or RP188 is present
Select RP 188 when the embedded ancillary timecode present on the input
video is used to determine the pulldown. The input frames with time code
frame numbers divisible evenly by 4 will normally identify the input A frame
candidates. (Feature not implemented at time of writing)
Select 6 Hz Input when a 6 Hz pulse connected to pin 1 of the AUXILIARY
I/O connector is used to determine the pulldown. The 6 Hz pulse should be
a 1/30
second wide TTL level active high pulse occurring 6 times per
th
second and must be coincident with the start of an input frame. The 6 Hz
pulse will normally identify the A frame candidates.
Select Free Run when you want a continuous 3:2 pulldown on the output
but do not care if it matches specific frames of the input video.
Revision 1.1
7700 MultiFrame Manual
7714HDC High Quality Down Converter
7714HDC - 15
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