MOTU micro express-USB, Руководство пользователя

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U S I N G T H E F R O N T P A N E L L C D
109
External Time Base Status Display
The SYNC window gives you a time base status
display to the right of the “tb:”.
Vid means video.
LTC or MTC indicate SMPTE or MIDI Time Code.
Following the time base indicator is the status
display. If it says “No TB”, this means that it is
waiting to receive a valid time base, as determined
by its MASTER SYNC setting. If MASTER SYNC is
set to LTC or MTC, you'll see the “No TB” message
while the MIDI Timepiece AV waits to receive
incoming time code, which it will use as the time
base. If MASTER SYNC is set to one of the three
VIDEO modes, you'll see the “No TB” message if
the MIDI Timepiece AV is not properly receiving
video input, which it uses as the time base in these
modes.
Once the MIDI Timepiece AV locks on to a stable
time base, it displays “TB OK” for a moment and
then displays the sample rate it is generating based
on the current time base.
When the MIDI Timepiece AV both locks to a
stable time base and begins converting, it displays
the digital audio sample rate it is generating, based
on the current time base (either external or
internal).This display can be very helpful for
determining if the SMPTE frame rate settings are
correct and if the external time base is both stable
and accurate.
You may also see the “JAM” indicator. For a
complete explanation, see “Stable but not locked”
on page 97.
Master Sync
Use the VALUE knob to choose the appropriate
time base and address sources. See “Choosing a
master SYNC mode” on page 118 for an
explanation of these settings.
Word Clock Out
Use the CURSOR and VALUE knobs to choose the
sample rate and sample clock format (DIGI for
Digidesign superclock or 1X for standard word
clock). The sample rate can be either 44.1K or 48K,
and there are three variations of each frame rate:
normal, pull-up (UP), and pull-down (DN). The
pull-up and pull-down sample rates can be used in
the standard fashion when working with audio that
will be transferred between video (at 29.97 frames
per second) and film (24 fps) — or other frame
rates.
SMPTE Volume Out
This setting lets you adjust the volume of the
SMPTE output from the MIDI Timepiece AV.
S Y N C 0 0 : 0 0 : 0 0
E
E x t t b : V i d : N o T B
S Y N C 0 0 : 0 1 : 1 4
E
E x t t b : V i d : 4 8 0 0 7
M A S T E R S Y N C
D
I N T E R N A L
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W O R D C L O C K O U T
D
4 4 . 1 K U P D I G I
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S M P T E V O L U M E O U T
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!USB Interfaces Manual Book Page 109 Tuesday, October 10, 2000 12:43 PM