MOTU Digital Timepiece Bedienerhandbuch PDF herunterladen (Seite 120)

SYNCHRONIZATION WITH THE AV

118

CHOOSING A MASTER SYNC MODE

In any synchronization scenario, there is a master,

and there are slaves. With the MIDI Timepiece AV,

you can, in most situations, choose which device

will be the master. And you can even choose

different, independent master sources for

transport control, time base, and address.

For example, you could choose house sync (video

blackburst) as the time base master, choose the

MIDI Timepiece AV itself as the address (SMTPE

time code) master, and manipulate the transport

controls of everything (ADATs, Pro Tools, any

MMC device, and your sequencer) from your

computer.

Advice about choosing a time base master

In general, you should try to set things up in your

studio so that the master time base is either the

MIDI Timepiece AV itself or video house sync.

Both are especially designed to provide an

extremely accurate, stable time base—more stable

than SMPTE time code (LTC and, especially,

MTC). When you set things up in this fashion,

SMPTE time code (either LTC or MTC) is used just

as an address source, while timing stability is

handled entirely by the MIDI Timepiece AV.

Finding the MIDI Timepiece AV sync controls

The MIDI Timepiece AV synchronization controls

are in the SYNC menu in its front panel LCD. You

can get to this menu by turning the WINDOW

knob on the front panel. Then use the CURSOR

knob to proceed through the menu. The ﬁrst

setting, MASTER SYNC, is explained in the next

section. You can ﬁnd corresponding settings in the

MTP AV Console software, as described in “Sync

window” on page 94.

SUMMARY OF SYNCHRONIZATION MODES

In total, the MIDI Timepiece AV offers seven

synchronization modes for its MASTER SYNC

setting. Each mode provides a different

combination of sources for a time base master and

an address (SMPTE time code) master. The seven

modes are as follows:

Below is a brief explanation of each mode.

LTC QuikLock

When the MIDI Timepiece AV locks to SMPTE

time code (LTC), it employs a digital audio phase-

lock loop to accurately synchronize ADATs and

other digital audio devices connected to its Word

Sync Out port. The MIDI Timepiece AV’s lock-up

time (approximately 4-5 seconds) is quite favorable

compared to other similar digital audio synchroni-

zation devices. As of this writing, we know of no

other digital audio synchronizer that can lock to

LTC as quickly as a MIDI Timepiece AV.

LTC QuikLock, on the other hand, is speciﬁcally

meant to be used in situations where you are not

synchronizing any digital audio or gen-locking to

video. In QuikLock mode, the MIDI Timepiece AV

temporarily disables its digital audio phase-lock

loop, allowing the AV to serve as a SMPTE-to-

MIDI converter only. With the digital audio

features “switched-off,” lock-up time (the time it

takes the MIDI Timepiece AV to lock up to

incoming time code when it is ﬁrst received) is

reduced to less than one second.

Master Sync mode Address source Time base

LTC QuikLock SMPTE (LTC) SMPTE (LTC)

INTERNAL MTP AV MTP AV

MTC MIDI Time Code MIDI Time Code

LTC SMPTE (LTC) SMPTE (LTC)

INTERN/VIDEO MTP AV Video

MTC/VIDEO MIDI Time Code Video

LTC/VIDEO SMPTE (LTC) Video

!USB Interfaces Manual Book Page 118 Tuesday, October 10, 2000 12:43 PM

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