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Subject: Re: Mixing 2 VGA signals --> VGA out
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 7 Nov 2002 14:50:18 +0200
NNTP-Posting-Date: Thu, 07 Nov 2002 14:50:01 EET
Organization: Sonera corp Internet services
sounds wonderful indeed if that would be possible (own faders for all three
"Gibbo" wrote in message
> "Joseph Goldburg" email@example.com wrote:
> >HI All,
> >I would like some silicon suggestions on how to
> >overlay, fade in/out or do picture in picture
> >with 2 VGA inputs to 1 VGA out to drive a monitor
> >I was thinking
> >VGA.a ---> 3ch ADC.a --> Buffer.a (dual port ram)
> >VGA.b---> 3ch ADC.b ---> Buffer.b (dual port ram)
> >and then
> >Buffer.a ---> CPU -----> Buffer.c -----> DAC ---> VGA out
> >Buffer.b ----> CPU
> >Any pointers on topology and silicon suggestons would be appreciated.
> I remember an engineer a few years ago who hacked a VGA card to allow
> sync signals to be input. This removed the need for A/D and dual port ram.
> have no idea how though !
> He simply synced both VGA cards together then mixed the analogue outputs.
> you could do this it makes the job real easy.
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