de/Rastra oscillographic synthesizer
The de/Rastra oscillographic synthesizer developed by Kyle Evans is a real-time audio/video instrument and computer-interfacing device that allows a performer to generate visualizations intrinsic to cathode ray tube technology while simultaneously creating the acoustic analog of the displayed imagery. Sounds crazy – and yes, it definitely is:
Atmel 328 communicates with a program designed in Max/MSP via xBee wireless communication.
4 Force sensing resistors: generate sounds and visuals by varying the amount of pressure applied to them.
3 axis accelerometer: modulates signals as the instrument is moved through space.
4 momentary push button switches: Generates sonic and visual accents and quick events.
6 flip switches: Used to change between the different program states throughout the performance.
Multiple audio signals created by the Max/MSP patch are amplified by a 4 channel power amplifier @ 100W per channel and inserted into the CRT’s yoke (X and Y deflection axes controlled by different signals). This deflects the electron beam in a fashion that is directly connected to the audio being produced.
Additionally, an electromagnet inside the CRT, also being driven by an audible sine wave, deflects the beam further creating the colorization.
The de/Rastra oscillographic synthesizer is an open source project and will eventually be accompanied by tutorials on methods of CRT hacking. You can find many more info on the yaktronix website or in the following scribd document: