From: kconlin++at++es.com
Date: 08/20/2001 09:43:12
On Friday, August 17, Julien Hanower wrote:
> can you tell me what are exactly the different words:
> frame locking, genlock, chanlock?
Genlock is a video synchronization scheme that is typically accurate
to within a fraction of a pixel and has very low jitter. Among other
things,
it allows you to mix video streams, something that's very important for the
broadcast industry. In simulation, it's used to synchronize the rasters
in multichannel systems and to mix symbology from external equipment.
Frame lock is a somewhat loose term describing a video synchronization
scheme that is accurate from within a few pixels (better implementations) to
half a line or more (poorer implementations) and may have significant
amounts
of jitter. Frame lock is suitable for most channel synchronization
applications
but not for video mixing. Neither frame lock nor genlock by themselves
coordinate buffer swapping among multiple channels. Chanlock(TM) is
proprietary channel synchronization scheme available on Evans & Sutherland
PC simulation products that combines genlock with buffer swap locking.
-- Kevin Conlin Evans & Sutherland "We're Canadians. We HAVE to be polite" PGP public keys available.
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