[mythtv-users] What is your video ouput card for your tv ?

[Cory Papenfuss]

> Yes, but the original link provided by Guillame shows a vga to scart
> connector.  As far as I know, NTSC doesn't use scart connectors in its
> various cables.  Cory said he has built something that converts a vga to
> NTSC signal.  The vga to scart connector would be to get a vga to PAL
> signal I would imagine - I don't know what SECAM is.  At any rate, what
> I'm asking is for information on how to make the type of adaptor Cory
> made, as I would like to use a connector such as this, but cannot use
> scart.  It seems to me, that you should be able to do this and us the
> component input of a TV for instance.
> Raphael
>
 	Yes, this can be done.  It's called a 'transcoder' in the A/V 
world.  Really, it's just implementing a RGB->YUV colorspace 
transformation in analog.  That's even easier to build than the AD724 
circuit.  All you need are three high-speed video amplifiers (think 
op-amps), and some resistors.  There are plans on the 'net for how to 
build those as well.

 	I haven't built one quite yet, as the tv I use only does 480i on 
the component input anyway.  Not too much improvement over the s-vid, so 
it hasn't been worth it.  When I get some more time (read: finish my 
degree), I'll likely resurrect interest in the project.  I'd like to build 
a "swiss-army-transcoder"... something that has VGA as inputs, and VGA, 
composite, s-vid, and component as output.  Give it a correct frequency 
RGBHV in, and equivalent versions will come out the other side.  I'm also 
thinking of making the color subcarrier synchronous with the VSYNC to make 
it more standards-complient NTSC out.

-Cory

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* Cory Papenfuss                                                        *
* Electrical Engineering candidate Ph.D. graduate student               *
* Virginia Polytechnic Institute and State University                   *
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