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OPERATION
change Line1. Press the " & # keys to highlight Line2 indicating that it
can be changed. Press the $ & % keys to change Line2. Press the
SETUP or CLR keys to exit the setup menu or press the SELECT key to
return to the TIMECODE drop down menu.
determine by experience the most suitable lines for recording VITC,
according to the following criteria.
In order to protect the VITC reading process against dropouts, the VITC is
usually repeated on 2 non-adjacent lines in the vertical interval of the video
signal, not earlier than line 10 (6 for PAL) or later than line 20 (21 for PAL).
For certain recordings, the use of some of these lines may interfere with
other signals inserted into the vertical interval.
To avoid decoding errors, an adequate margin should be allowed between
the video head switching points and the recorded VITC word. Also note
that type C VTRs with a sync head have a head switching point in the
middle of the permitted lines. Type C VTRs without a sync head do not
reproduce some of the permitted lines at all; therefore these lines should
not be used for recording VITC.
information.
It is recommended that two non-adjacent lines are used, however adjacent
lines and a single line (selected when both lines are the same) are permitted.
3.9.8
Selecting the Lines to Record VITC on - (3-line VITC Standard)
When the generator assignment is set to one of the three-line modes, two
blocks of 3 lines are encoded. The first VITC line follows the LTC
generator, except that it is updated at the field rate instead of the frame
rate. The second VITC line is used to encode the full KeyKode edge
number including frames and pulldown information. The third line is used
to encode the RDR 2 time and user bits. (See section 3.3.1 for a complete
description of the 3-line VITC mode).
Although the actual choice of lines is up to the user, the following line
ranges are recommended.
Block 1
Block 2 (optional)
White Flag (optional)
3.9.9 Turning the VITC Generator On
The VITC key is used to turn the VITC keyer on and off. When the VITC
generator is Off, the program video passes through the VITC keyer with
nothing added. When the VITC generator is On, the primary VITC will
Model 4025TR Film Footage Encoder Manual
See your VTR manual for further
NTSC
14-15-16
17-18-19
12
The user will have to
PAL
14-15-16
19-20-21
12
Page 3-42
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