MOTU micro express-USB, Руководство пользователя

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U S I N G M I C R O E X P R E S S C O N S O L E
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This slider lets you control how many frames in a
row the Micro Express needs to receive to consider
incoming SMPTE as being parked on a single
frame. While lowering this value makes the Micro
Express more responsive when you park on a
frame with your video deck, it is also more likely to
misinterpret ordinary transport shuttling. So make
this value as low as you can, but raise it if you start
getting improper frame locations when shuttling
your deck.
Offset/start time
Start time is the SMPTE frame at which you would
like to begin striping time code. You can type in the
desired time here. Notice also that there are two
buttons to the right of the offset for starting and
stopping striping. For details about striping, see
“Striping SMPTE” on page 73.
The Sync window displays an offset time when the
master source mode is MIDI Time Code , LTC
(SMPTE) , or LTC QuikLock modes in which tape
striping is not possible. You can only start striping
when the master source is set to
Internal .
Take care when using Offset/start time
The LTC start setting in the Micro Express serves as
the start frame when striping, but also as the offset
when reading. If you stripe at 1 hour (1:00:00/00)
and then lock to the time code you just striped —
without readjusting the star/offset setting back to
0:00:00/00, then the Micro Express converts
starting at 2 hours (2:00:00/00).
Transport buttons (Internal mode only)
These buttons make the Micro Express start and
stop generating time code (both MTC and LTC)
when the unit is in Internal mode. When you click
the green triangle, time code will begin at the
frame entered in the
Start time field.
LTC output
These options control the SMPTE time code (LTC)
output from the SMTPE jack on the rear panel of
the Micro Express. The frame Format options (24,
25, 29.97, 30, and drop) determine the frame rate
that will be generated. These option are grayed if
any master mode other than Internal is chosen.
This is because in all other cases, the Micro Express
is merely reading and matching the timecode being
received from an external source.
The Signal Level options let you adjust the volume
of the SMPTE output from the Micro Express. It is
grayed in LTC QuikLock mode.
The “Continuous Signal” option applies to
situations in which you are feeding time code
(most likely LTC) to the Micro Express, and the
time code continues even when its source is parked
on a frame. For example, you might be using a
VITC-to-LTC converter that continuously sends
time code when video is paused. In this situation,
you can enable the
Continuous signal option to
make the Micro Express continue to output time
code (both LTC and MTC) as well. This option is
grayed in Internal sync mode.
Sync routing
The Sync source (which is basically any MTC
converted or generated by the Micro Express) can
be routed to any destination port (see “MIDI
routing” on page 36). This can be useful if you
encounter cases where need to transmit MTC to
some other destination besides the computer
connected to the Micro Express. For example, you
may want to synchronize a drum machine or
another computer to the same SMPTE signal. In
this case, you would just connect a “MIDI OUT” of
the Micro Express to the “MIDI IN” of the
destination device and route Sync to the
appropriate destination port the MIDI Routing
window as shown in Figure 6-11 on page 39.
!USB Interfaces Manual Book Page 43 Tuesday, October 10, 2000 12:43 PM