Chapter 3: Pro Tools | SYNC HD Hardware
21
Video In/Out
Video In
Receives a signal from an SD
(NTSC/PAL) video source for clock or VITC
positional reference input, or for generating a win-
dow burn. This connector is internally terminated
at 75 ohms.
The Video In connector does not accept HD
reference signals.
Video Out
Outputs the current Video In signal.
This output can also carry VITC and/or Window
Burn information if those features are enabled.
MTC Out
The MTC Out outputs MIDI Timecode (MTC)
only. No other MIDI data appears at this output.
MTC output can be regenerated while the
SYNC HD is locked to any supported positional
reference and clock reference, or internally gener-
ated in Generate mode, in which case MTC output
follows generator run/stop. This port is intended to
supply MTC from the SYNC HD to external se-
quencers or other MIDI devices.
MTC is output continuously whenever the
SYNC HD is generating timecode. This output can
be muted when timecode (LTC) is idle. See “MTC
Output and Idle Muting” on page 42 for details.
LTC In/Out
LTC In
Receives a Linear Timecode (LTC) source,
balanced or unbalanced analog, for positional
and/or clock reference. This port is often used to
receive LTC from an audio track on an external
deck or the address track of a VTR. Adjustable
LTC servo gain is available in Pro Tools and from
the front panel.
LTC Out
Outputs linear timecode, in balanced or
unbalanced analog audio format. The SYNC HD
can be set to mirror incoming LTC on this port, or
to generate LTC based on incoming serial time-
code.
LTC output level is adjustable from the Synchroni-
zation page of the Peripherals dialog in Pro Tools,
the controls on the front panel of the SYNC HD.
See Chapter 8, “Wiring Diagrams and Pin Assign-
ments” for wiring details.
AES/EBU In/Out
AES/EBU In
Receives an AES/EBU digital audio
signal, for clock reference purposes only. The
SYNC HD utilizes only the signal's clock informa-
tion, not the audio information. If digital audio in-
formation is present at this input, it will be ignored
and not passed through to the AES/EBU digital
output connector.
AES/EBU Out
Outputs a silent (all bits OFF)
AES/EBU audio signal whose sample rate exactly
matches the SYNC HD sample clock.
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