MOTU Digital Timepiece Bedienerhandbuch PDF herunterladen (Seite 127)

SYNCHRONIZATION WITH THE AV

125

MIDI time code to the computer. To correct the

settings, see “Getting a running update of SMPTE”

on page 125.

Routing MIDI Time Code

At times, you may need to route MIDI Time Code

to a device connected to one of the MTP AV’s MIDI

OUTs. Similarly, you may have the need to route

MTC to the network port on the MIDI

Timepiece AV. For example, the network port

might be connected to a Macintosh, which you

need to slave to time code. To make time code

routings such as these, see Figure 10-9 on page 90.

SMPTE Offset

When reading time code, there may be times when

you need to offset the MIDI Timepiece AV a certain

amount from the time code you are feeding it. See

“Offset/Stripe” on page 110 for details about how

to set the offset from the MIDI Timepiece AV front

panel or “Offset/start time” on page 96for doing so

from MTP AV Console.

Freewheeling to avoid time code dropouts

When the MIDI Timepiece AV encounters a drop-

out —a series of missing or unreadable frames—in

the SMPTE time code, it “freewheels” past them,

pretending that they were not missing by brieﬂy

generating its own code to make up for the missing

frames. The default freewheel value is 4 frames.

This means that the MIDI Timepiece AV will

continue to generate time code for four more

frames after it stops receiving time code. If it does

not receive any more time code after four frames, it

will stop converting.

The factory default base setups have the

freewheeling feature set to 4 frames for fastest

response when you stop the tape deck. The

Freewheel amount can be adjusted up to 32 frames.

This allows the MIDI Timepiece AV to maintain

lockup even over lengthy SMPTE drop outs.

If you encounter a time code drop out that causes

the MIDI Timepiece AV to stop converting for a

moment, try increasing the “Jam for” amount in

the Sync window of the MIDI Timepiece AV

Console (or in the front panel LCD of the MIDI

Timepiece AV itself). Try adding just a few frames

at a time when adjusting the amount. (For details

on the “one time jam sync” option, see

“Regenerating fresh time code (‘jam syncing’)” on

page 127.)

The MIDI Timepiece AV freewheels at the frame

rate it is reading at the time it begins freewheeling

— except for 29.97 drop and non-drop. If you

intend on reading 29.97 SMPTE, be sure to

manually set the SMPTE format to 29.97 so that

freewheeling will occur at the proper rate.

When you increase the “Jam for” amount, you also

increase the amount of time that the MIDI

Timepiece AV keeps converting when you stop

tape. To make the MIDI Timepiece AV as

responsive as possible, only raise the “Jam for”

amount as high as necessary to overcome the drop-

out(s) you are encountering.

Getting a running update of SMPTE

You can get a running update of SMPTE on the

front panel of the MIDI Timepiece AV by using the

WINDOW knob to dial up the SMPTE/SYNC

menu. The ﬁrst window of the menu displays

SMPTE.

You can also get a running update of SMPTE in the

MTP AV Console SMPTE display.

STRIPING SMPTE

The MIDI Timepiece AV can stripe SMPTE time

code (LTC) — even while it is resolved to video.

You can stripe LTC onto video without the time

code drifting out of sync with the video frames.

!USB Interfaces Manual Book Page 125 Tuesday, October 10, 2000 12:43 PM

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