MOTU HDX-SDI User's Guide download pdf (Page 36)

MOTU VIDEO SETUP

Master (Internal)

Choose Master (Internal) (Figure 6-5) to make the

HDX-SDI resolve to its own internal clock when

capturing from a device (such as a deck) that is

resolved to the HDX-SDI’s output. For example,

when using RS-422 machine control to drive a

video deck connected to the HDX-SDI, the

HDX-SDI serves as the clock master and drives the

video deck. Because the deck is resolved to the

HDX-SDI, the video signal being captured from

the deck is genlocked.

REF In (SDI only)

Choose REF In (SDI only) (Figure 6-5) when you

wish to resolve the HDX-SDI to house sync

(blackburst) or another clock source connected to

its VIDEO REF input while capturing video from

the SDI input. The REF IN can only be used when

capturing SDI input and cannot be used when

capturing other video formats. For other formats,

use the Input Source or Master (Internal) setting

instead.

When capturing HD, the REF In option supports

both Bi-Level and Tri-Level sync. When capturing

SD, the reference input must be bi-level.

Clock source during capture

If the input source is SDI, you can choose any of the

three available clock source options. For other

input formats, use either the Input Source or Master

(Internal) Capture Clock Source setting.

Playback Clock Source

The Playback Clock Source setting (Figure 6-1) lets

you specify the timing reference for the HDX-SDI

when it is in Playback mode. Three choices are

provided in the menu, as shown in Figure 6-6:

Figure 6-6: Playback Clock Source menu.

Input Source

Choose Input Source (Figure 6-6) when you wish to

resolve the HDX-SDI to the video signal being

received on the currently chosen input in the Input

Source menu (Figure 6-3) during playback.

Internal

Choose Internal (Figure 6-6) when you wish to

resolve the HDX-SDI to its own internal clock

during playback.

REF In

Choose REF In (Figure 6-6) when you wish to

resolve the HDX-SDI to house sync (blackburst) or

another clock source connected to its VIDEO REF

input while playing video.

When playing back HD, the REF In option

supports both Bi-Level and Tri-Level sync. When

playing back SD, the reference input must be

bi-level.

Clock source when switching between Capture

and Playback modes

When the HDX-SDI switches its clock source, it

may take a brief moment for it to resolve to the new

source. If you need to frequently switch between

Capture and Playback modes, set the capture and

playback clock sources to one of the combinations

listed below:

With any of these combinations, you can switch

back and forth between capture and playback

without losing genlock. This ensures a smooth,

quick, seamless transition when switching modes.

Capture Playback

Input Source Input Source

Master (Internal) Internal

REF In (SDI only) REF In

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MOTU HDX-SDI User's Guide Page 36

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