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From: skinner@saber.UUCP (Robert Skinner)
Newsgroups: net.graphics
Subject: Re: RGB to composite output ?
Message-ID: <1662@saber.UUCP>
Date: Mon, 1-Jul-85 12:58:24 EDT
Article-I.D.: saber.1662
Posted: Mon Jul  1 12:58:24 1985
Date-Received: Fri, 5-Jul-85 03:32:34 EDT
References: <6105@ucla-cs.ARPA>
Distribution: net
Organization: Saber Technology, San Jose, CA
Lines: 33

> 
> CALLING ALL GRAPHICS WIZZERS -----------
> 
> How can I take the output (loopthrough) of an RGB monitor and
> record it on a VCR? Is there a "black box" available that will
> convert RGB to composite so that I can use a standard VCR or
> do I need a special VCR? All information /recommendations 
> appreciated.
> 
> Specifics: monitor is a Hitachi HM-3619A 19" color
>            with 1280 x 1024 resolution 
>            claimed bandwidth 45khtz
>            RGB in and out via BNC plugs
> 
> -- 
*** REPLACE THIS sync LINE WITH YOUR MESSAGE ***

I know there are black boxes for RGB to composite, but I'm sure its going
to be *expensive* for your specifics.  Composite video uses 525 vertical lines
with a 15.75KHz scanrate, *interlaced*.  Any box that could convert your 
video to composite couldn't do it on the fly.  It would have to contain a 
full color video memory, so the input and output could be almost totally 
asynchronous.  It would also have to do some kind of filtering to compress
1024 lines of information into 525 (or 512).  I'm sure it can be done, but
for what kind of $$$?

------------------------------------------------------------------------------

Name:	Robert Skinner
Mail:	Saber Technology, 2381 Bering Drive, San Jose, California 95131
AT&T:	(408) 945-0518, or 945-9600 (mesg. only)
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