DigiDesign SYNC HD Manual page 50

From the SYNC Setup software utility
(Windows only):
Select Linear Time Code (LTC) from the SYNC
Setup Positional Ref pop-up menu.
Make sure you select the appropriate clock refer-
ence, sample rate, frame rate, and freewheel du-
ration. Also make sure the LTC signal is routed
properly to the SYNC peripheral LTC In connec-
tor.
Freewheel Duration
Freewheel duration (time code 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 time
code drops out or is otherwise interrupted. Free-
wheel settings are ignored when the SYNC pe-
ripheral is in Internal/Generate mode.
Example of Time Code Freewheel
In a 30 fps Pro Tools session, if Freewheel Dura-
tion/Time Code Freewheel is 28 frames, the
SYNC peripheral will continue to generate until
either the incoming time code signal is restored,
or until 28 frames elapse, whichever occurs first.
To set the freewheel duration:
From Pro Tools:
In the Time Code Settings section of the Ses-
sion Setup window, enter a number of frames for
time code 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,
44 SYNC HD Guide
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.
From the front panel:
Press Set, and use the Up and Down switches
1
to display Freewheel Length ("FrEE LEn").
Press Set to display freewheel duration
2
choices.
Press the Up or Down switches to scroll
3
through available choices (from "4 Fr" or four
frames, to "40 Fr" or 40 frames).
Press Set.
4
From the SYNC Setup software utility
(Windows only):
Choose a value from the SYNC Setup Free-
wheel Duration pop-up menu.
VITC and Positional Reference
Because VITC is time code 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
regions 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.