MOTU micro express-USB, Руководство пользователя

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S Y N C H R O N I Z A T I O N W I T H T H E A V
128
Timepiece AV receives a SMPTE signal on its
SMPTE IN cable, it always regenerates a fresh
signal that exactly matches the incoming signal and
sends it out the SMPTE OUT cable (except for
drop-outs, which it eliminates with freewheeling).
To regenerate SMPTE:
1
Connect the original SMPTE track to the
SMPTE IN on the MIDI Timepiece AV, and
connect the SMPTE OUT from the MIDI
Timepiece AV to the destination SMPTE track
(which could even be on a different tape deck).
2
Set the “Jam for” option in the SMPTE Controls
window to a high enough number of frames to
cover any drop outs that may exist in the current
time code.
Try setting it to between 2 and 8 frames, unless
there is an obviously large dropout. If so, set it
more than 8 frames. This ensures that drop-outs in
the old code are not reproduced in the fresh code.
3
Roll tape and set the SMPTE volume levels.
When the MTP AV is reading the old time code, it
generates fresh time code via its SMPTE OUT jack
only when it is in LTC mode; it won’t regenerate
LTC in
LTC QuikLock mode.
4
When the levels are set, roll tape and convert as
normal.
The MIDI Timepiece AV automatically creates
fresh SMPTE time code that matches the original
time code and its relation to the other tracks on the
tape. In addition, the MIDI Timepiece AV
freewheels over drop-outs in the old time code so
that the new, clean code has none.
Lengthening a SMPTE track
If the time code on your SMPTE track ends too
early and you need to add more code, you can use
the “One time” jam sync option. To do so, feed the
original track into the MIDI Timepiece AV and
record the fresh code onto a new track. Be sure to
start from the beginning so that you regenerate the
entire length of the original track. When the MIDI
Timepiece AV reaches the end of the original
SMPTE track, it will begin striping on its own. To
stop striping, click the Stop button or wait until the
MTP AV reaches the stop time.
Synchronizing to discontinuous time code
The MIDI Timepiece AV has the ability to stay in
sync with discontinuous time code — that is, time
code that has no gaps in it but does have jumps in
its frame locations. For details about how to do
this, see “Frame lock” on page 94.
Regeneration and time code bits
Except for when it is in LTC QuikLock mode, the
MIDI Timepiece AV always regenerates fresh time
code from its SMPTE out jack. Time code user bits
embedded in incoming LTC on its SMPTE input
are not preserved.
Slaving a sequencer to the MIDI Timepiece AV
To slave your sequencer to the MIDI Timepiece AV:
1
In your sequencer, make your sequencer look
for MIDI time code from the “Sync” input. This is
the virtual input on which MIDI Time Code is
received from the MIDI Timepiece AV.
Tape Deck
MIDI Timepiece AV
Fresh
SMPTE Time code
Original
SMPTE Time code
!USB Interfaces Manual Book Page 128 Tuesday, October 10, 2000 12:43 PM