MOTU Digital Timepiece User's Guide download pdf (Page 36)

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101

FRONT PANEL SETTINGS

Below is a brief explanation of each mode.

INTERNAL

Choose this setting when you want the Digital

Timepiece to be the time base master and SMPTE

address master. This mode is highly recommended

for stable sync. This mode is also recommended

when you want to use MIDI Machine Control from

your computer sequencer or from any other

external MMC control surface.

For an example studio setup that would use this

setting, see Figure 5-1 on page 45.

MTC

Choose this setting when you want the Digital

Timepiece to slave to MIDI Time Code being sent

from a device connected to one of its MIDI inputs

or a computer connected to the RS422 REMOTE

port. This mode offers the least amount of time

base stability, so we recommend that you try to set

things up so that you can use one of the other

modes.

If you are thinking about MTC as a master source

for time base and time code, try to rethink your

synchronization strategy. For example, if you want

to control everything from the transport control

buttons in your computer software, you don’t need

to transmit MTC from the software to accomplish

this. Instead, transmit MMC commands from your

software to the Digital Timepiece and make the

Digital Timepiece be the time code and time base

master, while the software — and everything else

— slaves to the Digital Timepiece, as shown in

Figure 5-1 on page 45.

LTC

Choose this setting when you want the Digital

Timepiece to slave to incoming SMPTE time code

via the rear-panel SMPTE input. An example is an

analog multi-track tape recorder with SMPTE time

code striped on a track. The Digital Timepiece will

automatically detect the frame rate, with the

exception that it cannot distinguish between 29.97

and 30. Therefore, to ensure that the audio

components in your system will be driven at the

proper sample rate, be sure to set the Digital

Timepiece to the proper frame rate (via its front

panel FORMAT button) when using either 29.97

(drop or non-drop) or 30.

For an example studio setup that would use this

setting, see Figure 5-4 on page 47.

VIDEO/INTERNAL

Choose this setting when you want the Digital

Timepiece to genlock to video as a time base

reference only, but wish the Digital Timepiece itself

to be the address (time code) master. This mode is

highly recommended for stable sync. Also use this

mode when you would like to stripe frame-locked

LTC onto video. If the SMPTE frame format on the

front panel of the Digital Timepiece is set to 30

when you choose this video mode, it will

automatically switch to 29.97.

For an example studio setup that would use this

setting, see Figure 5-2 on page 46.

VIDEO/MTC

Choose this setting when you want the Digital

Timepiece to genlock to video as a time base

reference and to use MIDI Time Code (MTC) as

the master address source. If the SMPTE frame

format on the front panel of the Digital Timepiece

is set to 30 when you choose this video mode, it will

automatically switch to 29.97.

VIDEO/SMPTE (LTC)

Choose this setting when you want the Digital

Timepiece to genlock to video as a time base

reference and lock to LTC input received on its

SMPTE input on the rear panel for the master

address source. If the SMPTE frame format on the

front panel of the Digital Timepiece is set to 30

when you choose this video mode, it will

automatically switch to 29.97.

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MOTU Digital Timepiece User's Guide Page 36

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