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

Enclosure

Mouser BOM (does not include screws for enclosure)

#discret11 sur Instagram

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
@superbooth_berlin is getting closer!  Come over to FEZ, Berlin on 16-18 May (booth Z062) for some video synthesis action 🎚️ 📺 🎛️  (Yes, I’ll bring the latest Cadrans and Stable prototypes with me!)  Patch is:  - Rampes -> Seuils, with some modulation from Animate  - Component feedback from TBC2 (tamed a bit with Cadrans)  - both being keyed with FKG3 using the Superbooth logo coming from the computer through Entrée, encoded to 720p60 Component with VU007B.  #videosynthesis #videosynth #analogvideo #eurorack #superbooth #lzxtbc2 #lzxfkg3 #syntonierampes #syntonieseuils #syntonieanimate
#syntoniecadrans #syntonieentree #vu007b #syntonie
#Repost holographic_thought_process ・・・
#glitch #glitchart #glitchartidtcollective #analogvideo #circuitbending #discret11
Experimenting with RaspPi through new #Discret11 by holographic_thought_process at #livecinemalab spektrum_berlin … wicked machine!
(This is an extract of the last newsletter, part 3/3)
Stable update  The second revision of Stable has been built and tested, improving the noise level greatly by the use of active attenuverters, better power decoupling and moving the design on two boards instead of one, in order to help with the board layout. 
Active attenuverter also allows for a better nulling of the CV modulation when the attenuverter is centered, particularly useful since the Contrast, Brightness, Hue and Saturation CV inputs are normaled together.
Hard to give an ETA yet, as there is still some things to fix, asking to revise both boards, then the firmware is mostly done, recently added support for all HD formats supported by VU007B, meaning Stable can be used as a Luma processor (no hue or saturation control, unfortunately) and stabilizer with HD Component.
Though, hope to have it ready during the summer. Wait and see I guess?  Video showing what Stable can achieve on it’s own, without any other modules involved. Messing with the contrast, brightness, hue and saturation parameters until 0:25, then using the pre-processor jack output (unprocessed video input) into the CV inputs until 0:44, and the last part is using post-processor output as modulation, creating some nice feedback effects typical of Composite video glitch.
Recorded with BM Analog to SDI + Video Assist in Composite PAL/576i50.  #videoart #glitchart #analogglitch #analogvideo #eurorack #syntonie
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
(This is an extract of the last newsletter, part 2/3)  Cadrans update  Now that the work on Rampes is done, time to work on the next revision of Cadrans. Been modifying the current revision for the past week or so, fine tuned a couple things, will be spending a few more days on it to exhaust what I can do with the current revision of the boards.
Once done, schematic and board files will be revised, and finger crossed, those will be the production revisions!  Video demonstrating the crossfading feature of Cadrans, one RGB feed is made with Rampes shapes into Seuils input and CV input, the other feed is a stock video decoded with Entrée and processed through Isohélie for posterization. Both are faded using Cadrans, using one of Seuils logic outputs as a CV first, giving a keying related to the shapes, and then using Y output from Entrée into LZX Keychain to generate a key based on the external video.
Recorded with BM Analog to SDI + Video Assist in Component 720p60.  #videoart #videosynthesis #analogvideo #eurorack #syntonie
Video devices ready for distorsion. Built units and DIY kits in stock (link in bio). From left to right: #avemod #discret11 #truqueur / #trq
Same video input, various glitch flavoured outputs.
#analogvideo #videoart #glitch #glitchart #glitchartistscollective #videosynth #diysynth #videodistorsion #analogglitch #syntonie
#videoart #videosynthesis #analogvideo #eurorack #lzxdwo3 #reverselandfillmatrixmixer #rampes #syntonieseuils #syntonieisohelie #syntonieanimate #vu007b
@polygon1993 is beta testing the circuit I'm working on for a few months now. It's based on Discret11 encryption which was used by French TV in the 80s. More to come soon!!
#glitchart #analogic #discret11 #encryption #glitch #CRT
#videoart #videosynthesis #analogvideo #lzxdwo3 #lzxdsg3 #reverselandfillmatrixmixer #rampes #syntonieseuils #syntoniesolaire #syntonieanimate #vu007b
Started modifying the Discret11 to get some glitch out of it
#glitch #discret11 #syntonie #DIY
Pre-orders for CBV001 modules and standalone units are now open! 
Expected shipping date: early February for modules, end of February for standalone units.  Footage processed in NTSC, stabilized using Stable and captured with BM Analog to SDI + Video Assist.  #videoart #analogglitch #analogvideo #cbv001 #stable #eurorack #syntonie
黒木 
#discret11 #AVEMOD #syntonie #glitch #glitchart #CRT #circuitbending #DIY