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VGA & NTSC Composite inputs converted to VGA Out

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UPI:
I need to build a video AB switch/converter that can take NTSC Composite video into channel A and 16 color 640x480 VGA into channel B and send one of these to an LCD as a VGA signal. The channel sent to the monitor is selected with two TTL level signals.

I have modified the cheap Grandtec GVC-1000 converters to do the job in the past, but the Composite video to VGA conversion is pretty poor.
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1208335

I know there are better and more expensive off the shelf converters out there, but I would like to build my own if it can be done for under $300 or so.

Got any suggestions for an IC or circuit to base this project on?

marshallh:
FPGA with SDRAM frame buffer and some analog devices TV decoder, and another analog devices triple RGB DAC for VGA.

Psi:
You might be able to use a raspberry pi + usb composite capture device + usb VGA capture device for under $300

UPI:

--- Quote from: Psi on January 01, 2013, 07:49:24 am ---You might be able to use a raspberry pi + usb composite capture device + usb VGA capture device for under $300

--- End quote ---

Interesting idea! I already have both in hand. I'll have to see what the video quality looks like.

Since the Pi already has GPIO, it would be easy to do the switching control of the source.

My problem is that I don't do code so I have to rely on my brother for programming. My recent description for him was that he has "the reflexes of a cat, the speed of a mongoose and the reliability of a weasel".

Thanks for the suggestion.

UPI:

--- Quote from: marshallh on January 01, 2013, 07:07:43 am ---FPGA with SDRAM frame buffer and some analog devices TV decoder, and another analog devices triple RGB DAC for VGA.

--- End quote ---

Designing this from scratch may not be financially feasible. I would probably only sell 15-20 in a 3 year period so I can't invest a lot of time/money into the development.

Do you have any sample circuit diagrams available that could shorten the development time?

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