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OPERATION
required number of digits are entered, press the ENTER key to complete
the data entry into the generator User Bits.
Attempts to enter too many digits will result in the display being blanked.
Re-enter the correct value and press the ENTER key. Pressing the CLR
key will cancel the data entry mode without changing any data.
The numeric keys return to their normal functions when the data entry has
been completed by pressing the ENTER key or cancelled by pressing the
CLR key. The display prompt will return to its steady on state when data
entry mode has been completed.
Numeric entry mode must be terminated (the display prompt will be on
steady) before any of the front panel keys will resume normal operation.
3.9.5 Selecting the Generator Drop Frame Mode (NTSC only)
In NTSC, the video frame rate of approximately 29.97 frames per second
causes an error between real time and 'colour time'. To overcome this
problem, the drop frame mode was created. This mode compensates for
the approximate 4 minute per day error by dropping the first two frame
counts (0, 1) at the start of each minutes, except minutes 0, 10, 20, 30, 40,
and 50. A drop frame flag bit is set in the code when the drop frame format
is used. When the 4025 is operating in the NTSC video standard, the
generator may be programmed to operate in either the drop frame or non
drop frame mode.
Selection of the desired drop frame mode for the generator is performed
using the Format menu displayed on the character generator. Press the
FORMAT to access the Format menu. Using the
the TIMECODE menu. Use the
menu item and press the SELECT key to show the drop frame sub menu.
The currently programmed generator drop frame mode is shown in reverse
video. Press the
Press the FORMAT or CLR keys to exit the format menu, or press the
SELECT key to return to the TIMECODE drop down menu. See section
3.3 for more information about the various time code modes.
When the generator is operated in the one of the Jam Sync modes
(RDR1), or the 3 Line VITC Mode, the generator drop frame mode is the
same as the incoming Reader1 data. The Drop Frame sub menu shows
JAM RDR1. When the 4025 is operating in the PAL video standard, the
Drop Frame sub menu shows NOT AVAILABLE.
3.9.6
Setting up the 4025 for Jam Sync to the VTR Time Code
The preferred method of configuring the 4025 to Jam sync to the Record
VTR's time code is to use the internal time code generator in the VTR to
generate continuous LTC, and have the 4025 jam to it. The VITC from the
4025 has encoded film numbers and should be recorded on the VTR
Model 4025 Film Footage Encoder Manual
&
keys to highlight the DROP FRAME
&
keys to select the desired mode of operation.
&
keys drop down
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