papenfuss at juneau
Dec 17, 2003, 7:41 AM
Post #3 of 4
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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 $120.00. Works like a champ!
>
> -----Original Message-----
> From: mythtv-users-bounces[at]mythtv.org
> [mailto:mythtv-users-bounces[at]mythtv.org]On Behalf Of
> papenfuss[at]juneau.me.vt.edu
> Sent: Wednesday, December 17, 2003 7:55 AM
> To: Discussion about mythtv
> Subject: [mythtv-users] Homebrew YPrPb/NTSC transcoder?
>
>
> Hello all... Now that I've got a mythtv-0.13 system set up, I'm trying
> to get the most out of it. Sorry that this is off-topic a bit.
>
> My new roomate has an HDTV-ready set with component in, and I like the
> idea of using a real, honest-to-goodness modeline out of the VGA port to
> drive
> the TV. I've been scouring the 'net for some good plans to build a
> transcoder,
> but figured I'd ask here too, in case anyone knows.
>
> I'm looking to build a "Swiss army knife" transcoder. Takes VGA in,
> loops VGA back out, and provides component out (YPbPr), but also provides
> composite and S-Video out. The second circuit (composite) is easy, since
> it's
> all done in the AD724 chip. The first I've got issues with:
>
> Does anyone know why all the plans for transcoders on the 'net have H/V
> sync generators (one-shot timers, delayed logic gates, etc)? Why can't it
> just
> use the sync pulse from a custom modeline off the VGA port? Also, does
> anyone
> know where to find the specs for sync pulse length for HDTV modelines?
>
> Thanks for any advice:
> -Cory
>
>
> --
> *************************************************************************
> * The prime directive of Linux: *
> * - learn what you don't know, *
> * - teach what you do. *
> * (Just my 20 USm$) *
> *************************************************************************
>
>
>
>
--
*************************************************************************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
*************************************************************************
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