HSync and VSync out of CSync

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wn1999
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Joined: Wed Oct 05, 2022 7:01 am

HSync and VSync out of CSync

Post by wn1999 »

I want to make a converter box that converts 15kHz RGB, 31kHz(VGA), and Component to RGB and Component and i want to add Csync and HVSync as sync signals.

The one thing I not know is, how to get HVSync out of CSync. For example my RGB modded N64 only outputs csync as a sync signal. Is it possible to pass the TTL Csync signal through a LMH1981 to get HVSync?
Sirotaca
Posts: 103
Joined: Sun Mar 19, 2017 12:08 am

Re: HSync and VSync out of CSync

Post by Sirotaca »

I've used the ISL59885 in my own projects. It works fine, though I find it's more noise-sensitive than the classic LM1881, so if you want to feed it composite video you'll need an LPF to attenuate the chroma or else you can end up with spurious H-sync pulses. Unnecessary if you're only using luma or plain sync, of course.
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Guspaz
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Location: Montréal, Canada

Re: HSync and VSync out of CSync

Post by Guspaz »

The classic LM1881, however, unfortunately does not produce h-sync output.
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Syntax
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Location: Australia

Re: HSync and VSync out of CSync

Post by Syntax »

EL1883
ElBartoME
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Location: Germany

Re: HSync and VSync out of CSync

Post by ElBartoME »

I had problems with an LM1881 with multisync purposes. I used an LMH1980 and it works flawlessly. It gives you everything you need.
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