Avid Technology Pro Tools SYNC HD, Manual

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Pro Tools | SYNC HD Guide 26
Clock References and
Options
The following sections explain each clock refer-
ence choice in detail.
Video Clock Options
SYNC HD provides two video inputs, Video Ref
and Video In , which are each selectable for clock
reference.
For House Video Reference (Black Burst)
Use
the Video Ref connector.
For Incoming Video
Use the Video In connector.
Serial Timecode with MachineControl
MachineControl-equipped Pro Tools systems can
synchronize to serial timecode through either of
the SYNC HD 9-pin ports, or using a supported
USB serial adapter (Mac) or the COM port (Win-
dows). When using MachineControl, you can set
serial timecode as the positional reference, lock the
SYNC HD to a Video Reference, and clock
Pro Tools to external Word clock.
Video and Clock Reference
If you have only a single SD (standard definition)
video source, and if the video source and the
SYNC HD have a common video reference, then
you can connect the SD video signal to the Video
In connector.
In situations where a common Word clock is re-
quired between Pro Tools systems or consoles,
you can still use Video Reference to maintain sam-
ple accurate sync while using:
• Satellite Link to synchronize multiple Pro Tools
systems
• Pro Tools as a dubber or stem recorder in
Remote Mode or Deck Control mode
• a Pro Tools system in a Video Satellite
configuration (if digital audio interconnects are
required)
Video Reference and Frame Edge
Alignment
When video reference is present and locked,
Pro Tools automatically aligns to frame edge.
When the SYNC HD Video Ref connector is re-
ceiving a valid video signal, the
Ref Present
indi-
cator in the Session Setup window lights.
The Video Ref ports are a non-terminated
loop-through connection. If the second
Video Ref port is not used, then you must
terminate it using the included 75-ohm
BNC terminator.
MachineControl also provides 9-Pin Deck
Emulation mode, but this mode is not sup-
ported through either of the SYNC HD 9-pin
ports. See the MachineControl Guide for
more information.