Specifications

SYNC I/O Guide44
To use VITC as SYNC I/O positional reference:
From Pro Tools:
■ In the SYNC Setup section of the Session
Setup window, select VITC from the Positional
Reference pop-up menu.
From the front panel:
■ Press the Positional Reference switch to select
VITC.
From SYNC I/O Setup software utility
(Windows only):
■ Select Vertical Interval Time Code (VITC)
from the SYNC I/O Setup Positional Ref pop-up
menu.
Additional VITC-Related Settings
SYNC I/O Settings Make sure to set the appro-
priate clock reference, sample rate, frame rate,
and freewheel duration.
Connections and Sources Make sure that your
VITC-striped video signal, if any, is routed to
SYNC I/O Video In connector (not the Video Ref
In connector). If you use a black burst signal as
clock reference connect it to the Video Ref In
connector.
You should consider using Video Ref as your
Clock Reference (rather than Video In) when
working with VITC because a black-burst signal
at the Video Ref input will always be there, un-
like the video signal at Video In, which may dis-
appear if the videotape disengages.
Auto Switch LTC/VITC Positional
Reference
In Auto Switch mode, SYNC I/O switches auto-
matically between LTC and VITC depending
upon which is delivering the best time code sig-
nal. This is indicated on the front panel by the
LTC and VITC positional reference LEDs (both
will be lit), and by a decimal point between the
minutes and seconds. on the front panel time
code display.
VITC cannot be read at high speeds (shuttle
speeds, for example) while LTC can, and LTC
cannot be read at slow speeds (while VITC can
be read at slow speeds, and when parked). Auto
Switch LTC/VITC provides the best of both LTC
and VITC reading without having to manually
switch settings.
Auto Switch LTC/VITC Requirements
• Make sure the LTC signal is routed properly to
the SYNC I/O LTC In connector;
• Make sure the VITC-striped video signal is
routed properly to the SYNC I/O Video In
connector (not the Video Ref In connector);
• Make sure to have or stripe matching code on
both your LTC and VITC tracks (and your on-
screen video window burn, if any).
• Make sure to select Auto or the correct line
pair for VITC Read.
• Make sure to select the appropriate clock ref-
erence, sample rate, frame rate, and freewheel
duration options.
To select Auto Switch LTC/VITC for positional
reference:
From Pro Tools:
■ In the SYNC Setup section of the Session
Setup window, select Auto Switch (LTC/VITC)
from the Positional Reference pop-up menu.
From the front panel:
■ Press the Positional Reference switch to select
Auto Switch LTC/VITC (indicated when both
the LTC and VITC LEDs are simultaneously lit).