Cory Papenfuss wrote:
There is a thread on nvnews about the component out in Linux, but no
real conclusions yay or nay. Someone here (Cory?) built his own, but I
never did get all the details. Seemed pretty simple from what I remember.
Ooops... I just re-read what I was accused of accomplishing. The
circuit I built converterted RGBHV (i.e. VGA) at 480i frequencies to
*composite* (and s-vid). It wasn't component.
The RGBHV->component is a much easier circuit, though. There are
lots of instructions on the 'net for how to build a transcoder for that.
The toughest part is figuring out which gain matrix is correct for
RGB->YPbPr... there seem to be a few different ones floating about.
Also, one minor caveat that I think most people happily ignore is
that component video is supposed to have bipolar sync signals. Unlike
the TTL-like signals of RGBHV, component sync is supposed to be
nominally zero, go negative for a bit, then posititive for a bit, then
back to zero. It keeps the DC level of the sync signal zero so DC
restoring circuits aren't necessary.
I don't recall any of the DIY transcoders doing that, but they seem
to work all the same.
-Cory
The more I research this, the more I think I'll just buy a premade one...
Tom
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