Video Sync Connections; Time Code Connections; Audio Word Clock - MOTU V4HD User Manual

VIDEO SYNC CONNECTIONS

Connect a video sync source, such as blackburst, to
the VIDEO REF IN jack (Figure 3-9). This input
accepts either a Bi-level (SD) sync source or a
Tri-level (HD) sync source. The V4HD can resolve
to a VIDEO REF IN signal only when it is in
Playback mode. When it is in Capture or Convert
mode, it genlocks to the current video source. For
further information, see "Playback Clock Source"
on page 53.
Video ref termination and "thru"
The V4HD lets you daisy-chain the VIDEO REF
signal to another video device using the THRU
jack below the VIDEO REF jack. If you connect a
device to the THRU jack, set the termination
switch (Figure 3-9) to the THRU position.
If the V4HD is the only device (or the last device in
a daisy-chain), set the termination switch to the
75Ω TERM position. This is crucial for successful
genlock.
Figure 3-9: Video sync connectors.

TIME CODE CONNECTIONS

Connect any time code source, such as the time
code output from a camera or VTR, to the LTC IN
jack (Figure 3-9). If you wish to transmit time code
from the V4HD to another device, connect the
V4HD LTC OUT to the time code input on the
other device. See chapter 10, "MOTU SMPTE
Setup" (page 87) for information about managing
the V4HD's time code features.
I N S T A L L I N G T H E V 4 H D H A R D W A R E

AUDIO WORD CLOCK

The V4HD word clock connectors (Figure 3-10)
allow you to synchronize it with any other word
clock-equipped device.
Figure 3-10: Audio word clock connectors.
For standard word clock sync, you need to choose
an audio clock master. In the simplest case, you
have two devices and one is the word clock master
and the other is the slave as shown in Figure 3-15.
When the video features of the V4HD are disabled
(see "Enable Video" on page 50) and the V4HD is
operating as an audio interface, you can resolve the
V4HD to another device: connect its word clock
output to the V4HD's WORD IN jack
(Figure 3-11).
Digital audio synchronizer
Audio
clock
Word clock OUT
Master
Word clock IN
Slave
Figure 3-11: Slaving the V4HD to word clock. For the V4HD clock
source, choose 'Word Clock In' . This configuration is only supported
when the V4HD is running in Audio Only mode (video features are
disabled).
V4HD
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