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OPERATION
The 'A' frame is always a f1/f2 picture, the 'B' frame is a f1/f2/f1 picture, the
'C' frames is a f2/f1 picture, and the 'D' frames is a f2/f1/f2 picture.
During 24 frame per second transfers in NTSC, a pulldown indicator is
added to the right of the film frame numbers. This indicator shows whether
the transferred frame is A, B, C, or D type. An underscore (_) shows video
frames that contain two different film frames.
shown in the following table:
Indicator
A
B
B
C
D
D
During 30 frame per second transfers in NTSC, and 25 frame per second
transfers in PAL, the pulldown indicator is blanked. The pulldown indicator
is also blanked in 24 frame per second transfers when the telecine is not in
normal run speed.
In 30 frame per second NTSC transfers or 25 frame per second PAL
transfers the field dominance of the transfers will affect the film frame
numbering. In field 1 dominant transfers, where the film frame changes at
the beginning of the video frame, the timecode and film numbers should
both update together in field 1 of the video. In field 2 dominant transfers,
where the film frame changes at the beginning of video field 2, the
timecode numbers will change in field 1 of the video, and the film numbers
will change in field 2.
3.12.7 VCG Film Sequence Lock Indicator
When film edge codes are displayed, a plus sign (+) is used between the
feet and frame numbers to indicate when the telecine has achieved a
stable play speed and the 4025 has properly locked onto the transfer
sequence.
3.12.8 Counting Sequence Error Indicator
When the Engineering DIP switch is ON, an asterisk (*) is used between
the seconds and frames digits to indicate when the timecode burn-in does
not follow the expected sequence of numbers.
between the footage and frames digits of the film edge number display to
indicate then the film frame burn-ins do not follow the expected sequence.
3.12.9 Remote control of Character Generator Windows and Status
Screen
Some of the common character generator functions cannot be operated
with a GPI trigger or remote switch connected to the Serial I/O connector of
the 4025.
These inputs are internally pulled to +5 volts and may be
grounded to pin 6. The Toolbox software parameters VCG GPI menu item
allows you to select from one of several methods of VCG remote control.
Model 4025 Film Footage Encoder Manual
Type of Frame Indicated
A Frame
B Frame first 2 video fields
B Frame third video field
C Frame
D Frame first video field
D Frame last 2 video fields
The indicators used are
An asterisk is used
Page 61
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