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7 - Appendix
Sync Daughter Card Supplement
94 Creative Professional
SMPTE Modes of Operation
Host Mode
The host computer is the source of synchronization. MTC messages are sent to the Sync
Daughter Card from the computer application and converted into SMPTE. MTC is also
output from the MIDI port on the Sync Daughter Card.
External Mode
SMPTE messages from SMPTE In are converted to MTC (quarter-frame messages) and
sent to the host application. This happens automatically whenever LTC is received at the
SMPTE input jack. Clean SMPTE data is also transmitted from SMPTE Out if “SMPTE
(Regenerate)” is set.
Flywheel Mode
If the incoming SMPTE data is corrupted or missing frames, MTC code will continue to
be output if “Flywheel mode” is enabled. The flywheel modes are described below.
Flywheel Modes
Mode (fps)
Sets the transmitted frame rate when striping SMPTE.
SMPTE Striping
Edit this field to set the start time in hours:minutes:seconds:frames for
striping SMPTE.
Stripe Button
Initiates SMPTE Time Code generation at the SMPTE output beginning at
the time set in the striping display.
Stop Button
Stops SMPTE striping. This button also stops SMPTE when One-Time Jam
Sync has been initiated.
Flywheel Mode
Selects one of the four Flywheel modes. See the descriptions below.
Output Level
Sets the SMPTE output level from -10dBV (consumer) to +4dBu (pro).
FLY/JAM Frames
If flywheel mode is on and a dropout is detected this is the number of fly-
wheel frames that will be output before the sync card stops and chases.
Word Clock
Termination
Turns word clock termination on or off. Except in special cases, this con-
trol should normally be left on. See “
Word Clock In/Out”.
SMPTE/MTC
Output Source
This control selects the source of the SMPTE output jack. The choices are:
Host MTC or the SMPTE Input jack (to regenerate SMPTE).
Off
Upon any dropout, MTC stops and the Sync card monitors the input for
valid code. If valid code is again received, it chases and relocks.
Fixed 0-127
Upon any dropout, MTC continues outputting Quarter-frame messages
at the same rate (flywheeling). When a dropout is detected, this is the
number of frames that will be output before the Sync card stops output-
ting MTC and monitors the input for valid code. If valid code is again
received, it chases and relocks.
Continuous
Upon any dropout, MTC continues outputting Quarter-frame messages
at the same rate (flywheeling). The Sync card monitors the input for valid
code and continues flywheeling until valid code is received, then relocks.
1-Time Jam Sync
Upon any dropout, MTC continues outputting Quarter-frame messages
at the same rate (flywheeling) without monitoring the SMPTE input until
the Stop button is pressed.