Introducing sync-ope: an analog video sync restoring circuit, and its applications to live glitch-art

next tuesday i am giving a talk as part of fu:bar festival. the talk is about:

  • what real-time / analog glitch-art is and how it can. be made
  • understanding some technical challenges with displaying / capturing this kind of glitch art, and some common solutions
  • introducing sync-ope, a utility circuit Gael Jaton and i have been building and how it works

when: 18:00 CEST, tuesday, october 6, 2020

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i will post some more about this project on scanlines at some point, but if you wanna find out more/ see a live demo/ ask me some tricky questions i hope to see u therr !

teasers:

here are a few images from my slides:





and a still from my (practice) live demo just now:

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this looks very cool! so much awesome stuff coming up. looking forward!

here’s the local time widget, i’ve found this very useful lately:
2020-10-06T16:00:00Z2020-10-06T17:00:00Z

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thnx! yes looking forward to the performances/talks u are part of for vectorhack/fubar too. and yah i tried to do that but couldnt get the timezone part correct. updated now :wink:

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Just a reminder that this talk is happening today, 18:00 cest

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I’ll be there! :mega:

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@cyberboy666 Will there be a recording of your talk available? Wanted to attend but got caught up with stuff, sorry!

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i think it will be uploaded as part of the fubar festival at some point soon

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some general ideas I had after your talk:

some people use the video signal as an audio source. if you remove the sync signal, it will sound better . what @palomakop said about a syncless output , using the inverted crossfader cv signal might be an interesting feature.
there could even be an amplifier so that there could be a line out.

the crossfader is controlled with a squarewave / pulsewave . so the switching is pretty fast. with glitch in mind, maybe it is interesting to experiment with a slew / lowpass filter to see if you can stretch the point to where the sync stays good. that might help getting more ‘halfstable’ glitch effects.

note: if you need footprints for the composite ins, check on snapEDA.com if there is already one available. saves you from making one yourself.

if you make it modular, a switch pulse output might be useful

ps: these are just ideas . I don’t mean you have to implement them, but maybe ‘someone’ could experiment. (maybe I will. who knows?)

Very cool project!

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thanks for the feedback ! these all sound like good ideas.

ahh i understand now why one might want to remove sync from video signal. i can imagine a small circuit with just lm1881 and cd4069 to strip sync too. also it could be added into this sync restore circuit but this kind of feels like a slightly different utility to me

iwas confused about the composite footprint comment until i looked at my picture again lol -> yes i have footprints for this, just hadnt decided what kind of jacks to put on the board yet haha. current version has both 3.5mm and rca. although still undecided what to include on a euro version where space is more valuable … :thinking:

open to exploring / collaborating with you on this if you are interested. can send u a pcb when we get a euro-proto fabd

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yeah i realized afterwards that one could just use an external sync stripper after the effect send output

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I was thinking that maybe the sync signal could be clipped before the send output, since it is DC restored, it just mean clipping everything under 0V, but this probably needs to be optional if the user wants to use it with video gear, as some will require to have the sync to operate.

Having two separate send/return IO, one for composite video, one for other signals can be great, as composite doesn’t need the sync stripping and requires 75 ohm termination/2x gain.

That’s what I had in mind to keep a euro module under 4HP, having a dual footprint for RCA/jack, so it can be built for one use or the other. The module could be made bigger to allow for both though.

Cause both use are super relevant: it’s a good way to stabilize glitched video, but also opens endless possibilities to process the video signal with audio gear or even video rate modules.

Also depends on how simple you want to keep it as the current board works quite well already, only tested with composite so far though.

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nice Project!
i am really interested to build one.

i had the idea to mod a ‘inverter’ effect i own into something link this - but never got round to actually do it .(it works in a similar way first splitting the sync stuff from the signal, then inverting the video and put sync back on)

am i missing the link or is the full documentation not open yet?

i’d be interested in a PCBs or participate in a group order :slight_smile:

all the files are here https://github.com/gaeljaton/Sync-Ope , already you can order some pcbs from these gerbers, or pm ur address i will sell some pcbs from this current batch i have. still the project is always evolving, and with feedback and ideas from others some changes may be made to make it better yet. (plus more documentation etc to come)

ps your inverter circuit sounds similar to this luma_croma_inverter circuit here, from @schaferob’s design

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awesome. even the kicad files and everything :heart_eyes:

i’ll look into the luma_croma_inverter thanks for the link

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