DigiDesign Pro Tools, Справочное руководство

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Pro Tools Reference Guide 798
Locked Indicator The Locked indicator stays lit
when the SYNC peripheral is locked to the se-
lected clock reference. The Locked indicator
flashes if the selected clock reference source is
missing or out of lockable frequency range.
Speed Cal Indicator This indicator provides the
accuracy of the incoming clock reference. The
Speed Cal indicator is lit when the output fre-
quency is within 200 ppm (0.02%) of the se-
lected sample rate. The Speed Cal indicator
turns off when the output sample rate is not at
the expected (or target) rate.
External Time Code Offsets
In the External Time Code Offsets section,
Pro Tools lets you compensate for devices that
are consistently offset by a fixed number of
frames (such as some color–corrected video mas-
ters), or for material that starts at a different
time than the session.
Pro Tools provides three different types of Ses-
sion Start Time Code Offset settings. These off-
sets include:
• MMC (MIDI Machine Control)
• 9-Pin (Serial machine control)
• Synchronization peripherals (such as a
Digidesign SYNC peripheral, or a MIDI in-
terface that provides MIDI Time Code).
Positive and negative offset values can be en-
tered to offset Pro Tools time code display later
or earlier, respectively.
Unique values can be defined for each of these
three types offsets, or you can link all three to
adjust in unison.
If you are using Digidesign’s MachineControl
option, additional options for External Time
Code Offsets are available. See the
MachineCon-
trol Guide for more information.
Time Code Settings
Generator
The Generator lets you enable Pro Tools genera-
tion and output of LTC and MTC. For more in-
formation, see “Generating Time Code” on
page 806.
Using Peripheral
This option outputs time code
from the device selected in the Synchronization
page of the Peripherals dialog.
Using MTC
This option outputs time code to the
destination selected in the Synchronization
page of the Peripherals dialog.
Freewheel
The choices in the Freewheel section let you
configure how Pro Tools will
freewheel , or con-
tinue playback if time code is interrupted or cor-
rupted. Use these options to protect against er-
rors that can occur if your SMPTE time code
source has “drop outs” or temporary lost signals.
None
No freewheel is applied.
Frames
Sets a number of frames to freewheel,
from 1 to 120 frames. This value defaults to 8
frames, which is the recommended setting for
most applications.
Jam Sync
Lets Pro Tools trigger synchronization
to incoming time code, and continue to play
back even if time code input is completely inter-
rupted. It can be useful if time code is damaged,
or has been accidentally erased from your source
tape.