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Topics in this section include:
Timecode and Sync
Timecode
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.
L
After two hours without power, the 688
reverts to a slightly less-precise time-
of-day crystal to maintain the date and
time on the device.
Word Clock connectors on the back
panel allow the 688 to be sample
synchronized with other digital audio
equipment in the work
fl
ow.
File-based recorders place a timecode and frame rate stamp in the BEXT and
iXML chunks of an AES31 Broadcast WAV
fi
le. During playback, the mixer gen-
erates SMPTE timecode from this number and extrapolates it based on the
timecode frame rate. All
fi
les 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
fi
le’s duration is always an integer number of seconds long. If necessary,
pre-roll and post-roll is dynamically applied to accomplish this, simplifying syn-
chronization in post-production. The timecode value and frame rate of the 688
are displayed on the Main screen.
Timecode
Frame rate or sample rate
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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.
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
Synchronizing the Word Clock
Setting Word Clock Sensitivity