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From: Martin Griffith
Subject: Re: Mixing 2 VGA signals --> VGA out
Date: Thu, 7 Nov 2002 14:25:45 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Thu, 7 Nov 2002 14:25:45 +0000 (UTC)
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On Thu, 7 Nov 2002 14:50:18 +0200, "J.A."
>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.
If you do manage to sync to VGA cards, use a LT1256 video fader ic
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