Avid Technology Pro Tools SYNC HD, Руководство пользователя

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Chapter 4: Using Pro Tools | SYNC HD 39
To regenerate LTC using Pro Tools:

In the
Sync Setup
section of the Session Setup
window, select any external positional refer-
ence.
To regenerate LTC using the front panel controls:

Press the Positional Reference switch to select
an external positional reference (do not select
Generate).
SYNC HD regenerates LTC as soon as it receives
a valid positional reference signal.
Generating LTC
In Generator Preset mode, SYNC HD can generate
LTC using either an external or internal clock ref-
erence. Make sure LTC is correctly routed and that
all your other gear is properly configured before
you begin. If necessary, adjust the input level for
the destination device.
To generate LTC using Pro Tools:
1
In the expanded Transport window, click
Gen LTC
.
2
Start Pro Tools recording or playback.
Pro Tools commands the SYNC HD to begin
generating LTC with time addresses synchro-
nized to the session time line.
To generate LTC using the front panel controls:
1
Press the Positional Reference switch to select
Generate.
2
Configure the timecode start in hours:min-
utes:seconds:frames using the Set, Up and
Down switches. See “Generator Start Time” on
page 38 for instructions.
3
To begin generating, press and release the
Run/Stop/Clear/Esc switch.
VITC Generation/Regeneration
When you use a SYNC HD to regenerate or gener-
ate VITC, you’ll be inserting VITC into an existing
video signal. The input is derived according to the
following rule.
VITC Video Source Rule
SYNC HD has two video inputs (“Video In” and
“Video Ref”). The following rule describes which
of these two signals VITC is applied to.

If the Clock Reference is set to either of the two
video inputs, then VITC will be applied to the
video signal at the Video Ref input.

Under all other combinations of Positional Ref-
erence and Clock Reference, VITC will be applied
to the video signal at the Video In connector.
In addition, the SYNC HD will not insert new
VITC while reading VITC from an external
source. This is a safety feature to prevent the loss
of existing VITC in the video stream. VITC is
never inserted when the Positional Reference is set
to VITC or Auto Switch LTC/VITC.
Example Video Input Configuration
One common situation is transferring video from a
source VTR (or a nonlinear video editing system)
to a destination VTR (or a nonlinear video editing
system). The video source signal is connected to
one of the SYNC HD video input connectors ac-
cording to the VITC Video Source rule.
The SYNC HD Video Out signal is connected to
the destination device. The SYNC HD is then able
to stripe the second VTR’s videotape with VITC.
(At the same time, you might also want to insert a
window dub. See “Generating a Window Dub” on
page 42.)
The Gen LTC setting you choose remains set,
session to session, until it is changed again.
Unlike LTC, SYNC HD can regenerate
VITC with both forward and reverse time-
code addresses.