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Path: utzoo!utgpu!water!watnot!watmath!mwtilden
From: mwtilden@watmath.UUCP
Newsgroups: sci.electronics,rec.video
Subject: Re: genlock chip
Message-ID: <6542@watmath.UUCP>
Date: Thu, 2-Apr-87 09:24:45 EST
Article-I.D.: watmath.6542
Posted: Thu Apr  2 09:24:45 1987
Date-Received: Sat, 4-Apr-87 11:49:54 EST
References: <3193@islenet.UUCP>
Reply-To: mwtilden@watmath.UUCP (M.W. Tilden, Hardware)
Organization: U. of Waterloo, Ontario
Lines: 29
Xref: utgpu sci.electronics:449 rec.video:785

In article <3193@islenet.UUCP> richard@islenet.UUCP (Richard Foulk) writes:
>In the March issue of Modern Electronics magazine there's a short
>description of a Motorola chip, MC1378, that's supposed to do
>genlocking via synchonization.  They say it has special provisions
>to handle VCR jitter.
>
>Has anyone investigated this chip or know anything more about it?
>
>I'm wondering how difficult/expensive it might be to stabilize the
>output from a VHS VCR so that better copies might be possible.
>
>Does this sound like the right approach?

By 'handling VCR jitter' they mean that the chip can stabilize a overlayed
video image with the freeze-frame output of a paused VCR.  It won't do anything
to improve the quality of the original signal.  To do such a thing would require
either a phaselocked circuit to restore the original sync pulses correctly or
a large frame buffer which could restore signal uniformity.  
There are VCR's which have this ability but they are expensive and difficult
to modify for better error reduction features.

Sorry.


-- 
Mark Tilden: _-_-_-__--__--_      /(glitch!)  M.F.C.F Hardware Design Lab.
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