Yes, it's very doable IF the video card can read closed captioning.
Some chip sets can't see any video data before line 21, and would
be blind to your data transmission. You'd then have to make sure your
data was on a line that was readable, probably starting at line 23.

Look for info on VITC (vertical interval time code) and CC closed captioning
to get a bootstrap on how it's done.

There are several better sync sep devices than the common National LM1881,
notably the Elantec EL4581C, (even though they second source a LM1881
equivalent).
http://www.elantec.com/pages/search.cgi?GOTO=SyncSeparators.html

Other videoish questions, write me directly.

Robert

Tony Nixon wrote:
>
> Hi all,
>
> I've got to sync some byte wise data to a video frame, and I was
> thinking of using one of those sync seperator chips and at the right
> time, blank the analog video info and bit bang a byte of data using just
> black and white levels.
>
> At the other end, the video info is fed to a video card in a PC which
> will be analyzing each frame to detect movement etc. I imagine it can
> also extract the digital data as well.
>
> Does this sound feasable?
>
> --
> Best regards
>
> Tony

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