Avid Technology Pro Tools SYNC HD, Manual

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Chapter 4: Using Pro Tools | SYNC HD 37
Offsets and SYNC HD Timecode Display
The SYNC HD front panel display continues to
display actual incoming timecode, regardless of
any External Timecode Offsets settings that are ap-
plied in Pro Tools.
To apply an offset to an external timecode source:

In the
External Timecode Offsets
section of the
Session Setup window, enter a time in an offset
field.
To apply the same offset to external MMC, 9-Pin,
Sync, and Satellite timecode sources:

In the Session Setup window, select
Link
to ap-
ply the same offset value to all devices.
Generating & Regenerating
Timecode
SYNC HD can generate LTC, VITC, and MTC si-
multaneously, obtaining time addresses from a va-
riety of sources:

When the Positional Reference is LTC, VITC,
or Bi-Phase, SYNC HD generates LTC, VITC, and
MTC simultaneously, based on the time address of
one of those sources.

When the Positional Reference is Serial Time-
code, you can set SYNC HD to generate LTC.
Read/Regeneration Mode
In this mode, SYNC HD regenerates timecode
based on external positional reference information
(LTC or VITC timecode, or a Bi-Phase/Tach sig-
nal). Subject to certain conditions, three types of
timecode (LTC, VITC, and MTC) are simultane-
ously regenerated from the selected positional ref-
erence.
Requirements for Read/Regeneration of LTC,
VITC and MTC
LTC
The external positional reference must be
moving at normal, 1x forward speed (±8 %).
VITC
The positional reference must be LTC or Bi-
Phase/Tach, at any readable speed, forward or re-
verse. SYNC HD will not regenerate VITC if the
positional reference is VITC.
MTC
In order for SYNC HD to regenerate contin-
uous MTC, the external positional reference must
be moving at normal, 1x forward speed (±8 %).
Outside of this speed range and direction, MTC is
generated in bursts every 200 milliseconds. This
allows MTC-slaved devices to read VITC or Bi-
Phase properly in either direction, and at speeds
down to zero. SYNC HD begins regenerating
MTC as soon as it again detects a valid positional
reference signal.
If the positional reference is LTC or VITC,
SYNC HD will regenerate timecode addresses that
match the incoming timecode addresses. If the po-
sitional reference is a Bi-Phase/Tach signal,
SYNC HD will generate timecode addresses start-
ing at the Bi-Phase preset start time. (See “Bi-
Phase/Tach Starting Frame” on page 35 for more
information.)
Timecode generated by SYNC HD does
not follow session Pull Up and Pull Down
settings.
To optionally mute idle time MTC output, see
“MTC Output and Idle Muting” on page 42.