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The operation of LTC Freewheel has three parameters that determine how it behaves:
1.
Chase Freewheel
—
This parameter determines the number of dropped frames that the SX-1 will
ignore before taking action. The available settings are 5, 10, 20, 50, and 100 frames.
2.
Chase Re-lock —
In essence, this parameter determines what action the SX-1 takes when the
Chase Freewheel amount has been passed. Chase Re-lock has three options:
a.
Always —
which means that the SX-1 will always attempt to re-chase, regardless of the
transport state.
b.
If Not Recording —
meaning that the SX-1 will always re-chase unless it is recording.
c.
Never —
meaning that the SX-1 will never attempt to re-chase dropped code.
3.
Re-lock Threshold —
The Re-lock threshold determines the amount of allowable drift between
itself and the master before the SX-1 takes action. The available settings are Automatic, 1/3 frame,
and 1, 2, 5, and 10 frames.
NOTE:
While it may appear as though Chase Freewheel and Re-lock Threshold are the same setting,
in actuality they are quite different. Chase Freewheel determines the number of dropped frames that
can pass before the SX-1 takes action. This means that the Chase Freewheel parameter only kicks in
when timecode is dropped completely —
meaning that no valid code is coming into the SX-1.
The Re-lock Threshold is always looking at the incoming LTC and comparing it to the SX-1 s code,
looking for variance between the two (which is referred to as drift —
as in boats and water current). If
the amount of variance between the master and the SX-1 grows larger than the value set in the Re-lock
Threshold, the SX-1 takes the action determined by the Chase Re-lock parameter.
7.
Added more visual feedback via the Lock LED
As indicated in #6 above, when chasing external timecode (especially LTC), the SX-1 is now much
more strict in watching for framerate mismatches and drift. If such a situation is encountered, the Lock
LED on the slanted front panel will blink quickly. To see the amount of drift and the frame rate that the
SX-1 is detecting, navigate to the LCD Transport screen.
