Setup guide

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House Sync
Workstation Setup Guide • 29
House Sync
Whenever you use more than one video device, you need to have video
synchronization. If the devices are not in sync, a monitor will show rolling,
tearing, or incorrect colors in the picture whenever you transfer the video
between devices.
A sync generator or house sync provides the synchronizing composite signal
to all other devices (video and audio) that must lock to the main video
program. This analog composite reference video signal, called “color black” or
“black-burst” video, is a timing pulse that is added to a composite video signal
and contains horizontal, vertical, and color synchronizing information.
Tri-level Sync In the case of HD video devices, you need a tri-level sync. Tri-level sync could
be considered synonymous to black-burst in that it is simply the reference
synchronizing information from the facility's master generator.
Each HD format needs a specific tri-level sync. You must use the proper tri-
level sync to synchronize your VTR and the Equinox video subsystem for all
the HD formats supported by Avid|DS.
The following table lists the HD formats currently supported by Avid|DS and
their relevant frame rates.
Sync Topology When syncing analog and digital video/audio devices, it is always preferable to
feed every component with a separate black-burst or tri-level sync signal in a
star pattern. Some drifting or jittering problems can be caused by the video
reference being looped from one machine to another.
HD format Supported frame rates (fps)
1080i Interlaced 30.00 fps, 29.97 fps, 25.00 fps
1080Psf Progressive 30.00 fps, 29.97 fps, 25.00 fps, 24.00 fps, 23.976 fps