Splitting sync-on-green video signal
in [Design]
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From: JosephKK on 13 Jan 2010 22:32 On Sat, 9 Jan 2010 21:38:33 -0800 (PST), mike3 <mike4ty4(a)yahoo.com> wrote: >On Jan 9, 10:16 pm, a7yvm109gf...(a)netzero.com wrote: >> On Jan 9, 5:09 pm, mike3 <mike4...(a)yahoo.com> wrote: >> >> >> >> > Hmm. But how about not only extracting the sync but also removing >> > it from the green line to get a pure green signal? In other words, >> > have >> > something where the input is the green+sync, the outputs horizontal >> > and vertical sync and also pure green component (no sync)? >> >> Clamp the black level and subtract it from the video, this will bring >> the video down by the 0.3V (IIRC) of the usual black level, but like >> John said, why? >> It makes the circuit complex and you don't see the syncs anyways so >> why remove them? > >Because I need to use this with monitors that do not support sync on >green. None of the monitors I have are listed as supporting sync on >green, and I think there aren't many models of monitors that actually >do, >are there? I've got an HNC AH191A monitor and Acer X223W, neither >of which ring up anything when searching for them plus "sync on green" >on Google. I don't want to get rid of the sync, just split it off into >separate >lines, like the monitor requires, and send it a pure green signal down >its >green port, as it requires. That is, to make a thingy that takes in >the >combined green+sync signal in one end and yields horizontal, vertical, >and pure green component signals out the other. Recover the separate sync and leave the green plus sync alone. It is NOT during displayable time; it is "blacker than black" (gun cutoff). It is not visible and will not hurt the monitor. |