DigiDesign SYNC HD, Manual

Page: 55 / 103

Chapter 4: Using SYNC HD 49
Compensating for Time Code
Offsets
You can offset the display of incoming time
code in the Pro Tools application. This is useful
when you want to adjust the display of time
code to match the start time of the session (such
as with source material that starts at a different
time), or compensate for source material that is
consistently offset by a fixed number of frames
(such as with some color–corrected video mas-
ters).
Pro Tools provides four different types of Exter-
nal Time Code Offset settings. These offsets in-
clude:
• MMC (MIDI Machine Control)
• 9-Pin (Deck Control)
• Synchronization peripherals such as the
SYNC HD, SYNC I/O, or other peripherals
(such as MIDI interfaces that provide MIDI
Time Code).
• Video Satellite (Pro Tools with Avid
Media Station|PT)
Unique values can be defined for each of these
types of offsets, or you can link all to adjust in
unison.
Positive and negative offset values can be en-
tered to offset Pro Tools time code display later
or earlier, respectively.
Offsets and SYNC HD Time Code Display
The SYNC HD front panel display continues to
display actual incoming time code, regardless of
any External Time Code Offsets settings that are
applied in Pro Tools.
To apply an offset to the external time code
settings:
„
In the Session Setup window, in the External
Time Code Offsets section, enter a time in an
offset field.
To apply the same external time code to all
devices:
„
In the Session Setup window, select Link to
apply the same offset value to all devices.
Generating & Regenerating
Time Code
The SYNC HD generates LTC, VITC, and MTC si-
multaneously, obtaining time addresses from a
variety of sources:
• When the Positional Reference is set to Gener-
ate, the SYNC HD generates LTC, VITC, and
MTC from an internal time address clock. This
is referred to as Generator Preset mode.
• When the Positional Reference is LTC, VITC,
or Bi-Phase, the SYNC HD generates LTC,
VITC, and MTC based on the time address of
one of those sources. This is sometimes called
regeneration or translation . For the SYNC HD,
this is referred to as Read/Regeneration mode.
Read/Regeneration Mode
In this mode, the SYNC HD regenerates time
code based on external positional reference in-
formation (LTC or VITC time code, or a Bi-
Phase/Tach signal). Subject to certain condi-
tions, three types of time code (LTC, VITC, and
MTC) are simultaneously regenerated from the
selected positional reference.
Time code generated by the SYNC HD does
not follow session Pull Up and Pull Down
settings.