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Noise Engineering
Cursus Iteritas
Dynamically generated wavetable oscillator using orthogonal functions.
Type
LFSR VCO
Size
10HP Eurorack
Depth
1.5 Inches
Power
2x8 Eurorack
+12 mA 150 / 80 (if 5v on)
-12 mA
5 / 5
+5 mA
0 / 90 (optional)
Cursus Iteritas is an oscillator that works from a dynamically generated
wavetable. It gives the user spectral-like controls over three different modes
based on different conceptualizations of frequency: Fourier, which uses sine
waves; Daubechies, using wavelets, and Walsh mode, using the Walsh
transform. Cursus Iteritas parametrizes a wide variety of sounds, but because
the sounds are all based off of orthogonal functions, it has a musical tone
structure and can produce an extremely wide variety of harmonic sounds.
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Summary of Contents for Noise Engineering Cursus Iteritas
- Page 1 5 / 5 +5 mA 0 / 90 (optional) Cursus Iteritas is an oscillator that works from a dynamically generated wavetable. It gives the user spectral-like controls over three different modes based on different conceptualizations of frequency: Fourier, which uses sine waves;...
- Page 2 Cursus Iteritas Dynamically generated wavetable oscillator using orthogonal functions. Interface All knobs on Cursus Iteritas function as offsets for the input jacks. The controls function similar to a bandpass filter; center, width, and tilt allow the filter to be asymmetric.
- Page 3 Noise Engineering Cursus Iteritas Dynamically generated wavetable oscillator using orthogonal functions. Patch Tutorial 0 - Introduction The easiest way to get to know Cursus is to just plug in the output and play with the knobs to get a feel for the sounds it can make.
- Page 4 Dynamically generated wavetable oscillator using orthogonal functions. Tone Generation Cursus Iteritas generates a spectral description based on knob positions. Center, Width, Tilt, Structure determine amplitudes for each harmonic. This description is fed into the inverse transform for the current function set to produce the time-domain wavetable. The wavetable is normalized to reduce amplitude variations across spectral changes.
- Page 5 Peterson 490 to tune to an octave interval. This is method is preferred to the meter-only method. Voltage Supply Cursus Iteritas can run its processor on the 5V eurorack power rail to reduce noise and load on the 12V bus. Gently push the switch tab in the direction of the desired rail to use.
- Page 6 Noise Engineering Cursus Iteritas Dynamically generated wavetable oscillator using orthogonal functions. Genesis and Design Notes This module started many years ago when Scott Jager and Yasi Perera turned me onto Walsh functions. The big question was how to reduce the large number of variables (32 harmonic volumes for a 32 band Walsh synthesizer) into a reasonable control set.
- Page 7 Noise Engineering Cursus Iteritas Dynamically generated wavetable oscillator using orthogonal functions. Special Thanks Kris Kaiser Scott Jager Yasi Perera Shawn Jimmerson Eric Cheslak Bana Haffar William Mathewson Mickey Bakas Tyler Thompson Alex Anderson References Hutchins Jr, Bernard A. "Experimental electronic music devices employing Walsh functions."...
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