MOTU 896HD User's Guide Page 24

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INSTALLING THE 896HD HARDWARE
24
SYNCING TO VIDEO AND/OR SMPTE TIME
CODE
To synchronize (continuously resolve) the 896HD
with SMPTE time code, word clock, video or
blackburst, you will need a MOTU Digital
Timepiece, MIDI Timepiece AV or any other
universal synchronizer equipped with word clock.
The synchronizer resolves continuously to the
chosen time base, and the 896HD slaves to the
synchronizer via word clock. In addition, the audio
software running on the computer slaves to MIDI
Time Code generated by the synchronizer, as
shown below in Figure 3-12. How accurate will
transfers be between your audio software and other
audio devices? As good as the resolution of MIDI
time code, which — at 30 fps — provides quarter
frame resolution of 120th of a second (367 samples
at 44.1 KHz). But if you are running your
synchronizer under its own internal clock
(triggering it via MMC from your software), you
will probably get even tighter timing than that —
perhaps as good as ±50 samples.
Figure 3-12: Resolving the 896HD to an external time base, such as SMPTE time code, word clock, or video. In this example, an S-VHS video deck
is supplying SMPTE time code (address) and video (as the time base). For examples of other sources, consult the MIDI Timepiece AV manual (or
other synchronizer).
Macintosh computer running any audio software
MOTU MIDI Timepiece AV or
Digital Timepiece slaving to
video and/or SMPTE time code
896HD
Audio cable bearing LTC
(Longitudinal Time Code)
word clock MIDI Time Code
(Via MIDI interface)
Choose Word Clock In as the clock source
in the MOTU FireWire Audio Console
application. If you have multiple inter-
faces connected, be sure to choose the
Word Clock In option that corresponds to
the interface receiving the clock signal.
Set up your audio software to
slave to MIDI Time Code.
Video deck
or other source for video and/or SMPTE time code
Video cable
bearing video
signal
Use this setup if you have:
Video and/or a SMPTE time code source.
A Digital Timepiece, MIDI Timepiece AV or other universal
synchronizer.
Host software that does not support sample-accurate sync
(although you can use this setup even if it does).
This setup provides:
No sample-accurate locating.
Continuous sync to SMPTE time code.
Sub-frame timing accuracy.
Transport control from the SMPTE time code source.
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