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April 1, 2006

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April 11, 2006

NIME - Performance Plan

For my Chua performance I intend to use my analog chua circuit, with an X-Y interface made of slide potentiometers along with the variable inductor I have constructed previously. On the display will be the analog oscilloscope output, possibly processed with Max/Jitter.

Sonically, I envision the performance to start out very slowly, with solo Chua starting with quiet, simple, near-sinusoidal oscillations (near-circles on the display). Gradually the sound will get slightly more chaotic but still dry, and a simple electronic beat will enter. The Chua will stay dry for awhile, but as a bit of synth is added into the beat, effects will start to be added, opening up the stereo effect and adding a bit of delay. This will gradually build to a climax, which will be full on chaotic Chua with a bass enhancer shifting material down to the lower octaves and getting a very intense rumble in addition to the chaotic top end. At an appropriate moment, this will give way to dry simple near sinusoidal Chua with beats. The beat will stop, and then the Chua wave fades away.

Northern Lights Demo Applet

For Living Art and Nature of Code, I am working on a simulation of the Northern Lights with Anne Hong for an art piece (introduced in this post) by my father, Ron Sears. I have mocked up software using Java and the Processing libraries to start experimenting with algorithms to control the light. The applet is based upon a simulation of 32 fixed color high-output LEDs arranged on 4 PCBs that will be mounted behind a large plexiglass lens inside a frosted streetlight globe (simulated with a gaussian blur in the applet), and uses a combination of trig functions with varying relative phase to approximate the dancing effect of the Northern Lights.
The code has been developed with portability to PIC C in mind, using lookups into a 1024 point quarter-wave 8-bit rectified sine table instead of real-time trig computation in order to save processor time with the intention that the simulation can run along with interleaved 32 channel PWM control on a single PIC18F4520 running at 40MHz.

View the applet.


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