[mythtv-users] Homebrew YPrPb/NTSC transcoder?

[papenfuss at juneau.me.vt.edu]

	Actually (I just looked it up), what I'm looking to build is a 
different beast.  The Super Emotia is (from what I read) a scan converter.  I'm 
not proposing a scan converter, just a transcoding doodad.  The video card will 
have to produce the correct sync rates for NTSC (in composite/svid mode) or an 
HDTV mode (e.g. 480p, 720p, etc).  The transcoder just does the coordinate 
transformation RGB->YPbPr and NTSC composite modulation (colorburst, 3.58MHz 
crystal, etc).

	Thanks for the tip though... it's possible such a thing exists.  Of 
course, since I'm a cheap bastard, an avid DIY'r, and have access to board 
cutting mills, making one seems promising... :)

-Cory

On Wed, 17 Dec 2003, mediaserver wrote:

> What you describe is basically an Extron Super Emotia (Or Super Emotia +).
> I bought mine off eBay for around $120.00.   Works like a champ!
> 
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org]On Behalf Of
> papenfuss at juneau.me.vt.edu
> Sent: Wednesday, December 17, 2003 7:55 AM
> To: Discussion about mythtv
> Subject: [mythtv-users] Homebrew YPrPb/NTSC transcoder?
> 
> 
> 	Hello all... Now that I've got a mythtv-0.13 system set up, I'm trying
> to get the most out of it.  Sorry that this is off-topic a bit.
> 
> 	 My new roomate has an HDTV-ready set with component in, and I like the
> idea of using a real, honest-to-goodness modeline out of the VGA port to
> drive
> the TV.  I've been scouring the 'net for some good plans to build a
> transcoder,
> but figured I'd ask here too, in case anyone knows.
> 
> 	I'm looking to build a "Swiss army knife" transcoder.  Takes VGA in,
> loops VGA back out, and provides component out (YPbPr), but also provides
> composite and S-Video out.  The second circuit (composite) is easy, since
> it's
> all done in the AD724 chip.  The first I've got issues with:
> 
> 	Does anyone know why all the plans for transcoders on the 'net have H/V
> sync generators (one-shot timers, delayed logic gates, etc)?  Why can't it
> just
> use the sync pulse from a custom modeline off the VGA port?  Also, does
> anyone
> know where to find the specs for sync pulse length for HDTV modelines?
> 
> Thanks for any advice:
> -Cory
> 
> 
> --
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> * The prime directive of Linux:  					*
> * 	- learn what you don't know, 					*
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> 
> 
> 

-- 
*************************************************************************
* The prime directive of Linux:  					*
* 	- learn what you don't know, 					*
* 	- teach what you do.						*
* 						(Just my 20 USm$)	*
*************************************************************************