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Article #6329

Re: NTSC video to VGA conversion?

#6329
From: Tom Bruhns
Date: Mon, 24 Aug 1992 18:43
12 lines
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jmorriso@ee.ubc.ca (John Paul Morrison) writes:

>Has anyone seen or built a project that will convert an
>NTSC input signal into something displayable on a VGA monitor?

VGA scans at about 31.5kHz; NTSC has a horizontal rate of about
15.75kHz.  If you don't do something to correct the difference,
you will get the right and left halves of the picture overlaid
on the monitor.  Correcting the difference involves buffering 
up quite a bit of data at the NTSC rate so it can be hosed to
the monitor at the faster rate.  Good luck doing it in one or
two ICs with current state of the art.
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Message-ID: <5170216@hplsla.hp.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!wupost!usc!sdd.hp.com!hp-cv!hp-pcd!hplsla!tomb
References: <1992Aug24.064613.5022@ee.ubc.ca>

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From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Mon, 24 Aug 1992 18:43:25 GMT
Subject: Re: NTSC video to VGA conversion?
Message-ID: <5170216@hplsla.hp.com>
Organization: HP Lake Stevens, WA
Path: arc1-ca.pugleaf.net!sparky!uunet!wupost!usc!sdd.hp.com!hp-cv!hp-pcd!hplsla!tomb
Newsgroups: sci.electronics
References: <1992Aug24.064613.5022@ee.ubc.ca>
Lines: 13