MOTU micro express-USB, Руководство пользователя

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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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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 125.
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 SMPTE offset setting in the MIDI
Timepiece AV 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 offset/stripe setting back to zero (0:00:00/00),
then the MIDI Timepiece AV converts starting at 2
hours (2:00:00/00).
Transport buttons (Internal mode only)
These buttons make the MIDI Timepiece AV 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 MIDI Timepiece AV. 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 MIDI
Timepiece AV 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 MIDI
Timepiece AV.
The “Continuous Signal” option applies to
situations in which you are feeding time code
(most likely LTC) to the MIDI Timepiece AV, 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 MIDI Timepiece AV continue
to output time code (both LTC and MTC) as well.
Word clock output
These options determine the sample clock rate at
which the MIDI Timepiece AV will operate. The
Pull-up and Pull-down sample rate options can be
used in the standard fashion when needed for
audio being transferred to and from video. Turn on
the “Superclock” option only if you are using
Digidesign hardware (such as Session 8 for
Windows) that requires it. For all other generic
word clock devices, leave it unchecked.
Sync routing
The Sync source (which is basically any MTC
converted or generated by the MIDI
Timepiece AV) can be routed to any destination
port (see “MIDI routing” on page 88). This can be
useful if you encounter cases where need to
transmit MTC to some other destination besides
the computer connected to the MIDI
Timepiece AV. 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 MIDI
Timepiece AV to the “MIDI IN” of the destination
!USB Interfaces Manual Book Page 96 Tuesday, October 10, 2000 12:43 PM