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Black and white video signal via S-Video
Moderator: adafruit

Black and white video signal via S-Video

by mschmidt on Thu Jan 22, 2009 1:10 pm

I have soldered all parts needed for video output and as described in the tutorial I've tried it on my TV.

Composite output looked OK, although it had some annoying distortions. I hope to get rid of them using the cap hack.

Then I've tried S-Video output and the picture looked great, that is very calm and with sharp lines. Unfortunately, it's only black and white.

What did I do wrong?
mschmidt
 
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Re: Black and white video signal via S-Video

by mschmidt on Thu Jan 22, 2009 1:26 pm

I've found the bug myself.

I had a look at the wikipedia page belonging to S-Video and I've learned that a single pin is responsible for transmitting the color information. Hence, I've soldered all four pins belonging to the S-Video output again and now it works.
mschmidt
 
Posts: 17
Joined: Fri Jan 16, 2009 11:09 am

Re: Black and white video signal via S-Video

by adafruit on Sat Jan 24, 2009 10:39 pm

That's right, thats why its so much clearer: the brightness (B&W) data is on one line, and the color data is on another. Basically NTSC has to work on both color and B&W TVs so thats why its such a mess :D

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