Re: more nvidia fx5700 TV out problems

Paul Mc Auley wrote:

> I meant to ask, how does SVideo stack up against the botched 
> job my all thumbs attempt would make of trying to solder a VGA plug would 
> be?

S-video has much better horizontal resolution than composite (because 
chroma isn't encoded on a dot-crawl subcarrier on luma, that is to say, 
they each have their own path so each has much higher bandwidth) but not 
quite as large a colour space/gamut as RGB.

...if the non-square pixels thing didn't make your brain melt, the maths 
of colour space conversion probably will. I don't have any links handy, 
but Google will no doubt oblige.

> Also, given the apparent simplicity of the VGA to SCART conversion 
> circuit, how come I can't seem to just walk into Maplin or Peats and 
> pick up one for a fiver?

Hassle factor: anyone selling these would be inundated with people 
returning them claiming "it don't work!" because many TVs' scart inputs 
ignore the RGB pins. Of the ones that *do* know about RGB, some want 
another pin on the scart plug pulled high or low (I forget which) to 
tell it to use it instead of the composite input (which afair is shared 
with the sync signal, just for added confusion; you can use a composite 
signal for sync only if you want...)

cjb

http://ocean.ucc.ie/~cjvdb1/

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