Download User Manual

Timecode and Sync
The 688 features a fully-integrated
Ambient™ timecode generator and
reader that supports all common rates
and modes. The 688 holds accurate
timecode for up to two hours after
shutdown, using its own internal,
Lithium-Ion timecode battery. This
timecode battery is charged whenever
the 688 is powered on.
LL After two hours without power, the 688
reverts to a slightly less-precise timeof-day crystal to maintain the date and
time on the device.
Topics in this section include:
Timecode
Setting
the Timecode Mode
Setting
the Frame Rate
Setting
Timecode Hold Off
Jamming
the Timecode
Setting
the Timecode Generator
Setting
User Bits
Setting
Display Mode
Word
Clock In & Out
Word
Clock Sensitivity
Word Clock connectors on the back
panel allow the 688 to be sample
synchronized with other digital audio
equipment in the work flow.
Timecode
File-based recorders place a timecode and frame rate stamp in the BEXT and
iXML chunks of an AES31 Broadcast WAV file. During playback, the mixer generates SMPTE timecode from this number and extrapolates it based on the
timecode frame rate. All files generated by the mixer have timecode numbers
that begin on the 0 frame (or 02 in DF modes) and end on the 0 frame such
that a file’s duration is always an integer number of seconds long. If necessary,
pre-roll and post-roll is dynamically applied to accomplish this, simplifying synchronization in post-production. The timecode value and frame rate of the 688
are displayed on the Main screen.
Timecode
Frame or Sample Rate
LL If sample rate is displayed–as shown–instead of the frame rate, toggle the view to
frame rate by holding METERS down and slide the RTN/FAV switch to the left.
65