Specifications

Chapter 4: Using SYNC I/O 51
To prevent destruction of the original VITC
code, SYNC I/O will not re-apply (regenerate)
VITC onto the same video stream from which it
is reading VITC.
LTC If you want to use LTC as a positional
source, do not select Auto Switch LTC/VITC.
External In order for SYNC I/O to regenerate
VITC based on an external positional reference,
you’ll need to select both a clock reference and a
positional reference.
To regenerate VITC based on an external
positional reference from the front panel:
1 Connect the video source to the SYNC I/O
Video Ref In connector and loop to the
SYNC I/O Video Input connector.
2 Press Set, and use the Up or Down switches to
display VITC Insertion (VI7C In5).
3 Press Set.
4 Use the Down and Up switches toggle be-
tween On and Off.
5 Press Set to select VITC Insertion.
6 Make sure you have selected the appropriate
format (NTSC or PAL, depending on your
project). For instructions, see “Video For-
mat/System” on page 61.
7 Press Set, and use the Up or Down switches to
display VITC Generate Lines (6En LInE).
8 Press Set. The default line pair is14/16, which
is also the SMPTE-recommended setting.
9 Use the Down and Up switches to scroll
through the parameter values and select a VITC
line pair.
10 Press Set. The LED Time Code Display will re-
turn to showing time code numbers.
11 Select valid clock and positional references.
SYNC I/O will regenerate VITC and insert it
onto the video signal (as soon as it receives a
valid positional reference signal).
To regenerate VITC based on an external
positional reference using SYNC I/O Setup
software utility (Windows only):
1 Ensure that SYNC I/O is connected in-line
with a video source and video destination.
2 Ensure that VITC Insertion Enabled is checked
in the SYNC I/O Setup window and that you
have selected the appropriate format (NTSC or
PAL).
3 Use the VITC Generate Lines menu to config-
ure the line pair, if necessary.
4 Select the appropriate clock reference.
5 Select either LTC or Bi-Phase/Tach from the
SYNC I/O Setup Positional Reference pop-up
window:
SYNC I/O will regenerate VITC and insert it
onto the video signal (as soon as it receives a
valid clock reference signal and positional refer-
ence signal).
Internal VITC Generation
SYNC I/O can also generate VITC internally, us-
ing its integral time code generating feature. In
this mode (Positional Reference switch = Gener-
ate) you can use either an external clock refer-
ence, or the SYNC I/O internal crystal as a clock
reference with a variable start time.
When generating VITC internally, if the inser-
tion is not timed based upon an upstream video
reference you may encounter repeated or
skipped VITC frames. Be sure to check “VITC
Timing Rule” on page 67 and “VITC Video
Source Rule” on page 50.