DISCRET 11
DISCRET 11: Video encryption from 1984
The circuit is based on the pirate decoder from Radio Plans magazine, 1984. This decoder permitted to watch TV shows from a quite famous French TV channel without paying, with the help of some specific ICs and some reflexion. It was based on two video delay line, a sync signal extractor and also a delayed/nondelayed line detection circuit.The original encryption working by delaying lines of the picture pseudo-randomly (with fixed delay times), Radio plan circuit was checking if the line was delayed or not, and with the 2 onboard delays, realign the lines of the picture to make it viewable. A Wikipedia page about this encryption is available (in French).
Discret11 keeps the delays, and also a quite similar sync extraction circuit as the one from the above schematic,however, the goal is to encrypt instead of decrypt, so the line detecting circuitry isn’t used. It’s replaced by frequency dividers, which divide the line frequency in subdivision, so the delayed picture appear every 2, 4, 8 lines, selectable using two rotary switches. The occurency of delayed lines can be set to random (with a circuit based on Random Gate from Yves Usson/Yusynth), in an attempt to reproduce the original encryption (a pseudo-random sequence of a length of 6 frames). The delay times, fixed on the base circuit, can be modified using potentiometers, which will delay the whole line but will also affect color the line (as the phase of the chrominance signal is delayed with the rest of the signal). A wipe between original, non delayed, signal and the delayed signal has been added. Two potentiometers adds glitch effects, with a switch to turn them off.
The project is now available assembled through the webshop.
DOCUMENTATION
– User Guide
– Build guide
– BOM
– Schematics
– Mouser BOM (does not include screws for enclosure)
#discret11 sur Instagram
Happy 2026, as always, thanks for the support during the past year!
2025 has been a bit slow in terms of releases for Syntonie, mostly as the focus was made on production and re-stocking the existing line up of modules, so the good news is that (almost) everything is in stock currently!
Two modules were released last year:
Détail, a Composite video filter that builds upon Syntonie analog glitch legacy, bringing some classic analog video effects in modular format, with voltage controllable parameters so it integrates perfectly in the 1V ecosystem.
And Sortie, the new incarnation of our RGB encoder/sync generator, the heart and brain of any video synthesis system.
Wish all of you the best for the year to come, keep videoing!
ps: Animate + its expander are currently available as a bundle with 15% off on Syntonie webshop.
#analogvideo #eurorack #glitchart #analogglitch #videosynthesis videosynth syntonie
Jan 6
In combination with Entrée and Sortie, Seuils makes for a nice coloriser by processing R, G and B channels from an external video source.
Entrée converts the external Component video signal to RGB, so it can be processed by Seuils, and Sortie encodes the resulting RGB back to Component.
Patching feedback from Seuils outputs back into its CV input generates glitchy effects like ringing and/or clipping.
Recorded in Component 720p60.
#analogvideo #videoprocessing #glitchart #analogglitch #eurorack #syntonieentree #syntonieseuils #syntoniesortie #syntonie
Dec 17
holographic_thought_process explaining his DISCRET11 to draincain and I, was way too awesome. #discret11 #crt #glitchartistcollective #holographicthroughprocess #longuestgacartistname #bluex80 #exhibition #paris #france #art #glitch #glitched #analog #analogglitch #sheglitchr #draincain
Oct 22
Seuils is back in stock!
Here, it is used to modulate Stable parameters, with Stable pre-proc output going to Seuils inputs, making this keyed/clipped-like effect. Stable post-proc output is going into Seuils CV to add some feedback, with Seuils attenuverters controlling the amount of feedback.
Recorded in Composite NTSC/480i59.94.
#analogvideo #videoprocessing #glitchart #analogglitch #eurorack #syntoniestable #syntonieseuils #syntonie
Dec 15
Rare picture of myself in my natural habitat, staring (and probably cussing) at an oscilloscope.
Went into a major overhaul of my workspace at the beginning of the year, partitioning it into better defined areas, as well as adding more storage space. Pictured here are the prototyping bench (left) and the assembly bench (right).
(Merci @thom.bret pour la jolie photo!)
#electronics #eurorack #videosynthesis #analogvideo #syntonie
Nov 26
Building a proof-of-concept RPi frame sampler w. cyberboy666 ! Records ~30 seconds NTSE 24bit video when GPU split is set to 128MB - with some additional #discret11 for effect. Code up on http://github.com/autr/rpi-frame-sampler #raspberrypi #openframeworks #videocircuits #videosynth
Mar 12
Animate EXP and Solaire are back in stock!
Here is one of my go-to patch: ramps and shapes from Rampes into Cadrans, with amplitude modulation from Animate + Animate EXP to add some motion. Outputs of Cadrans into Solaire, outputs of Solaire into ReverseLandfill Matrix Mixer, encoded in Component 720p60 with Sortie.
(Note that this is the last batch of Animate EXP and it won’t be re-stocked, so probably time to grab one to add some waveforms to your Animate)
#analogvideo #videosynthesis #videoart #modularsynth #eurorack #eurorackmodular #reverselandfillmatrixmixer #syntonierampes #syntonieanimate #syntonieanimateexp #syntoniecadrans #syntoniesolaire #syntoniesortie
#syntonie
Nov 3
Just received russian video chips for the Discret11! I had already tested the К174УП1, which is an equivalent of the TBA970 (video amp) but I have to test the K174XA11, which should be equivalent to TDA2593 (sync extractor), the leads looks rusted though, hope they work! #chips #circuitbending #analogglitch #syntonie #discret11 #DIY
Nov 21
Stable is back in stock!
I was asked if Cadrans would make a good addition to Stable. While it is probably not as instantly gratifying as other processors like Solaire, Seuils or Isohélie, Cadrans and its amplitude modulation is a good way to modulate how much feedback is applied to Stable.
To do so, Stable post-proc output is connected to Cadrans input, output of Cadrans going back to Stable CV inputs, closing the feedback loop. Then, a pitch sequence from a step sequencer (here a Beatstep Pro) is used as CV for Cadrans, essentially automating the feedback in sync with the music.
Recorded in Composite NTSC/480i59.94
Next on the re-stock list are Solaire, Animate EXP and VU001C.
#analogvideo #videoprocessing #glitchart #analogglitch #eurorack #arturiabeatsteppro #syntoniestable #syntoniecadrans #syntonie
Oct 21
Posterizer lovers and limited color depth enjoyers, Isohélie is back in stock!
Here used to process a picture, with Entrée, Rampes, VH.S Baja, ReverseLandfill Matrix Mixer and Sortie.
Animate EXP, Stable and VU001C restock will follow shortly.
Until next time!
#videoart #analogvideo #vhsbaja #reverselandfillmatrixmixer #syntonieisohelie #syntonieentree #syntonierampes #syntoniesortie #syntonie #eurorack
Oct 1
