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Date: Tue, 12 Nov 2002 17:19:06 -0500
From: Dan Barlow
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.1) Gecko/20020826
X-Accept-Language: en-us, en
Subject: Re: Help? Ways to build RGB divider to NTSC UHF transmitter?
Organization: Heller Information Services
> I want to take a 1600x1200 rgb signal. cut it into to 320x240 pieces.
> Then broadcast each piece to a separate uhf channel.
> What's the easiest way to do something like this. How much would it
> cost to prototype such a device.
> right now it's for a science project at my school, and I'll be seeking
> grant funding to build it.
It would be very hard to do this in the way you describe.
First you would need very fast Analog to Digital converters
to sample the source RGB. In the range 250 - 300 MHz I would think.
Then you would need a frame buffer for each output, and a NTSC encoder
for each output. The logic to steer the samples coming in at 300
MBytes/sec * 3 channels will have to be extremely well laid out.
You might need to double-buffer each output to allow one buffer to be
filled at high speed while the other is output at NTSC speed.
Hmm, you might be able to do it all in a fast FPGA with outboard
static RAM and ADCs and daughterboards for the outputs...
I think you would be better off buying a quantity of TVout
cards and doing the image breakup in software. You can get
video cards with up to 8 VGA outs and do vga to TV with an
external box... but you're looking at 25 outputs so it will
get expensive whichever way you look at it.
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