Specifications

SYNC HD Guide44
To set LTC as the SYNC peripheral positional
reference using the SYNC Setup software utility
(Windows only):
 Select Linear Timecode (LTC) from the Posi-
tional Ref
pop-up menu.
Make sure you select the appropriate clock ref-
erence, sample rate, frame rate, and freewheel
duration. Also make sure the LTC signal is
routed properly to the SYNC peripheral LTC In
connector.
Freewheel Duration
Freewheel duration (timecode freewheel) con-
figures the SYNC peripheral for the maximum
number of frames (from 4 to 40 frames, in incre-
ments of 4) it should continue generating if
timecode drops out or is otherwise interrupted.
Freewheel settings are ignored when the SYNC
peripheral is in Internal/Generate mode.
Example of Timecode Freewheel
In a 30 fps Pro Tools session, if Freewheel Dura-
tion/Timecode Freewheel is 28 frames, the
SYNC peripheral will continue to generate until
either the incoming timecode signal is restored,
or until 28 frames elapse, whichever occurs first.
To set the freewheel duration using Pro Tools:
 In the Timecode Settings section of the Session
Setup window, enter a number of frames for
timecode
Freewheel.
SYNC peripherals accept Freewheel duration
values from 4 to 40 frames, in increments of 4
frames, but Pro Tools allows duration values
from 1 to 120 frames (for MTC readers). If you
enter a Freewheel duration value lower than 4,
the SYNC peripheral will automatically set to 4;
if you enter a Freewheel value greater than 40,
the SYNC peripheral will automatically set to 40.
To set the freewheel duration using the front panel
controls:
1 Press Set, and use the Up and Down switches to
display Freewheel Length (“FrEE LEn”).
2 Press Set to display freewheel duration
choices.
3 Press the Up or Down switches to scroll
through available choices (from “4 Fr” or four
frames, to “40 Fr” or 40 frames).
4 Press Set.
To set the freewheel duration using the SYNC
Setup software utility (Windows only):
 Choose a value from the Freewheel Duration
pop-up menu.
VITC and Positional Reference
Because VITC is timecode information that is
embedded as part of the video signal, VITC can
be read when the VTR is paused or crawling
slowly. When working with Pro Tools, this
means that VITC can be used for Auto-Spotting
clips to particular video frames.
Video Ref vs. Video in
To ensure constant clock referencing, use
Video Ref input as your clock reference instead
of Video In, whenever possible. When using
Video Ref (and house sync), if the video picture
is lost, the SYNC peripheral will remain resolved
to the black burst signal at the Video Ref input.