Doremi Nugget - Manual (Page 37)

5 Synchronizing Multiple Nugget Units
Multi-screen applications, like 3D and Stereoscopic, require continuous frame accurate lock that
can be easily achieved on the Nugget players by using its “Chase” feature
NOTE: Synchronizing two or more units require Synchronized Playback.
5.1 Synchronized Playback
When two servers start playback in sync, but each is playing back with its own internal clock,
after a certain time they will drift apart and the frame accurate lock will be lost. Using the Nugget
Pro, players can synchronize their playback to an External Sync source.
5.1.1 Locking to External Sync Source
For 25, 29.97 and 59.94 FPS formats, bi-level or tri-level interlaced video sync must be fed to all
units.
For 23.98, 24 and 60 FPS formats, tri-level interlaced video sync must be fed to a units ll.
For 720p formats, feed 1080i tri-level sync at half the frame rate, so for 720p-60FPS formats
feed 1080i-30FPS.
NOTE: Sync generators that can support bi-level and tri-level sync have come down in cost and
they MUST be used in all installations involving synchronized playback.
5.1.2 Locking to LTC IN
The Nugget can also synchronize using LTC, however, because of the nature of LTC, this kind
of lock can be unstable and is only recommended for extreme measures when a video sync
generator is not available. To use LTC Sync, you must designate one of the Nugget Pro players
as the Master and set its Sync Source to Internal. All other Nugget Pro players will be
designated as Slaves and their Sync Source must be set to LTC IN.
Note: The LTC IN LOCK mode should be used in emergency situations, you should get a low
cost video sync generator and use that on a regular basis.
Locking to LTC requires NUG-SDI version 60 or higher.
5.1.3 Chase
A player in Chase mode can read the incoming timecode and start synchronized playback
without the need for an external controller. Chase mode requires a Master/Slave setup. The
current version of the Nugget firmware supports Chase.
NUG.OM.000105.DRM Page 37 Version 3.1
Doremi Labs, Inc.