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From: ltran@pluton.matrox.com (Linh TRAN)
Newsgroups: sci.electronics
Subject: Re: VGA TV
Message-ID: <1991Feb1.181337.4358@pandora.matrox.com>
Date: 1 Feb 91 18:13:37 GMT
References: <Jan.31.23.39.27.1991.9918@remus.rutgers.edu>
Sender: news@pandora.matrox.com (Usenet Administration)
Organization: Matrox Ltd.
Lines: 33

kma@remus.rutgers.edu (Kenneth Ma) writes:


>I have a multi-sync. monitor and wonder if the input frequency range
>is compatible with TV signals. Is it possible to direct the VCR output
>to the monitor, or it needs major hardware conversion? 

	I am affraid that you need a major hardware conversion, unless
your monitor has: 
	- a TV demodulator; or
	- a composite NTSC input;   
or your VCR could output:
	- direct RGB with sync and blanks;

	What you may need is a digitizer boards (or frame grabbing board)
which could cost from $1000 to $5000, depending on the quality. Be prepare
to pay between $1500 to $2000. Certainly, you could make your own board
with less features. Components are in the range of 200 to 500$.

	The main difficulty is:
	* VCR are made to record NTSC signal from TV. Picture informations
are encoded in Y (luminance) I (in phase color components) and Q (quadrature
color components). Inside any TV, there are circuitry which converts YIQ to
RGB (Red Green Blue). The VCR take the YIQ signal and store it on tape as
is, with no conversion at all, so it could play back to any TV with no
conversion.
	 monitors are RGB devices. it lacks the YIQ->RGB of the TV.

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