This, from the User Guide:
Synchronizing Audio and Video Equipment
Avid editing systems require synchronization (sync) when capturing audio
and video. The details of how synchronization works vary depending on
the input/output hardware you are using with your Avid editing system.
For more information, refer to the appropriate section in this topic for
the input/output hardware you are using.
Avid Adrenaline
Digital audio signals (AES/EBU, S/PDIF, and optical) contain their own
synchronization (sync) signal. A sync signal for analog audio and analog
video can also be generated from the connected REF signal, from incoming
video, or internally by the Avid Adrenaline.
The digital signal from a 1394 device has its own sync signal, to
which the Avid Adrenaline synchronizes.
When doing a digital cut, you need to select the type of sync you are
using in the Video Output tool.
The following list summarizes how sync works:
ï HD Tri-Level Sync ó Tri-level sync signals are generated from the
incoming tri-level house sync. If there is no sync connected, an
internal sync is used.
Tri-level sync works similar to an analog sync, but the tri-level sync
signal consists of a three-level sync pulse: zero volts (0V) blank, a
ñ0.3 V pulse, and a +0.3 V pulse.
Do not connect a tri-level sync to the Ref connector on the SD Video
I/O board or connect the reference sync to the tri-level sync connector
on the Avid DNxcel board. The proper sync signal must be connected to
the correct connector for the sync to work.
ï Video Reference IN (REF) ó Sync signals are generated from the
incoming black burst generator (BBGen) or from a house sync. If there is
no sync connected to REF, an internal sync is used.
By default, the sync signal is generated from incoming video whenever
you capture analog video. Depending on the configuration of the audio
and video equipment attached to the Avid Adrenaline, you might need to
use a BBGen or house sync; for example, when you perform an Insert Edit.
ï Incoming video signal ó When you capture video, a sync signal is
generated by the Avid Adrenaline from the incoming video: component,
composite, SDI, S-Video, or DV.
When you capture analog video and audio, the Avid Adrenaline generates a
sync signal from the incoming video, but it does not sync your video to
your audio. You must sync these externally to the Avid Adrenaline.
ï Word Clock Out signal ó The Word Clock Out signal is primarily used
to sync an audio device with the Avid Adrenalineís internal sync. When
the Avid Adrenaline generates a sync signal from a video input, an audio
device can use the Word Clock Out to sync to the Avid Adrenaline.
ï Incoming analog audio ó When you capture audio only, the Avid
Adrenaline does not sync to the incoming audio. An external sync should
be used in this case.
When you capture audio using the AES/EBU inputs on the Avid
Adrenaline, always use AES/EBU channels 1 and 2 first. The AES/EBU 1/2
connector syncs to the incoming digital signal. If you connect to the
AES/EBU 3/4 connector only, the internal sync on the Avid Adrenaline
does not sync with the incoming digital audio signal and the audio data
will be corrupted. Use the AES/EBU 3/4 connector only if you need 4
channels of AES/EBU audio.
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