MOTU micro express-USB, User Manual

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U S I N G M I D I T I M E P I E C E A V C O N S O L E
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device and route Sync to the appropriate
destination port the MIDI Routing window as
shown in Figure 10-11 on page 91.
TOOLBAR SYNC DISPLAY
The toolbar Sync display provides detailed
information about what state the MIDI
Timepiece AV is in as a synchronizer. The
following sections provide a brief explanation of
each term.
Figure 10-17: The toolbar Sync display.
Needs Time base
The flashing yellow “X” status indicator (displayed
in the MIDI Timepiece AV front panel LCD as “No
TB”) means that the MIDI Timepiece AV is waiting
to receive incoming signal (from video, LTC or
MTC) from which it will derive a time base. When
it successfully achieves lockup, the yellow X dims
and the
stable indicator lights up.
Stable
This status indicator means that the MIDI
Timepiece AV has established a stable time base.
You’ll see this indicator when one of the following is
true:
■
The MIDI Timepiece AV is set to Internal mode
■
The MIDI Timepiece AV is set to one of its three
video modes and it has successfully locked onto a
video signal
■
The MIDI Timepiece AV is set to either MTC or
LTC mode and it has successfully locked up to
either MTC or LTC
Locked
This status indicator (displayed in the MIDI
Timepiece AV front panel LCD as the current
sample rate, e.g. 48000 or 41000) means that the
MIDI Timepiece AV is successfully locked to an
external time base (LTC, Video, or MTC) and that
it is also successfully converting SMPTE time code.
Stable but not locked
This status indicator (displayed in the MIDI
Timepiece AV front panel LCD as “JAM”) means
that the MIDI Timepiece AV has been successfully
locked to external SMPTE time code in LTC/
VIDEO mode, but that it has also detected that the
SMPTE time code has drifted out of frame-lock
with video for more than five frames in a row.
In this situation, the MIDI Timepiece AV continues
to convert time code that is frame-locked to video.
Accordingly, the
stable time base indicator remains
lit up, but the locked indicator dims to alert you that
SMPTE time code on a video tape is no longer
frame-locked — that is, the time code has drifted in
relation to the actual video frames.
Here is a great way to put this feature to good use
and to ensure trouble-free video sessions: if you get
a video tape that has time code already on it, and
you have no way of verifying how the time code
was recorded, you should slave the MIDI
Timepiece AV to it (in LTC/VIDEO mode) from
start to finish once before you begin working with
it. If the
locked indicator remains lit up for the
entire length of the tape, you know that the SMPTE
time code is frame-locked and does not drift in
reference to video frames. If the
locked indicator
goes out, you are alerted that the SMPTE time code
is not frame-locked, and you can take appropriate
action with the MIDI Timepiece AV to fix the tape.
By connecting the video signal from your VCR to
the video-in jack on the MIDI Timepiece AV,
connecting the SMPTE-out jack to one of the audio
sample rate play/stop
time base status Needs time base
time base source
!USB Interfaces Manual Book Page 97 Tuesday, October 10, 2000 12:43 PM