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
Another quick patch with a similar setup as the previous video, but with ramps and 2D shapes from Rampes instead of an external video signal through Entrée. Recorded in 720p60.
Matrice is available as a pre-order on Syntonie website.
#videoart #videosynthesis #analogvideo #eurorack #syntonie
Mar 2
Synthesis patch made with Rampes, Combines, Seuils, Matrice and Sortie.
Various ramps, mirrored ramps and 2D shapes from Rampes are combined together using the three channels of Combines, outputs of Combines going to Seuils signal inputs and CV inputs to generate hard shapes/mattes, which are later processed through Matrice for color tuning using its matrix mixer, and its triple VCA to cut through the colors/creating negative space, finally outputs of Matrice are encoded with Sortie in 720p60.
#videoart #analogvideo #videosynthesis #eurorack #syntonie
Feb 25
While I enjoy patching synthesis in 720p60 for the increased resolution and frame rate in comparison to SD (PAL/NTSC), a good in between is ED (for enhanced definition), here 576p50.
It keeps the SD resolution and look, with those nice jagged/aliased edges, while benefiting from being progressive rather than interlaced, giving that smooth motion without requiring deinterlacing.
However, not a lot of devices can support ED standards, here a Retrotink 5X is used to convert Component 576p50 to HDMI 1080p50 for capture.
Modules used are Rampes, Animate, Seuils, Isohélie, and a couple work in progress 😉
#videoart #videosynthesis #analogvideo #eurorack #syntonie
Feb 4
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
