ODESSA variable spectrum harmonic cluster oscillator operator’s manual rev. 1975/1.
module explained lines. Always pay particularly close attention to the proper orientation of your ribbon cable on both sides! Also, observe that there are several pin headers on the board. connecting the power cable to an incorrect header will destroy your odessa! The unit should be fastened by mounting the supplied screws before powering up. To better understand the device, we strongly advise the user to read through the entire manual before use. SALUT Thank you for purchasing this Xaoc Devices product.
not change the pitch any further. This limitation does not include the pitch cv v/oct input which is handled by a separate precision A/D converter. moderate (just a few notches) to a maximum density of 256, where each second partial is filtered out (assuming minimum warp setting). This parameter can be controlled by external CV via the dedicated jack 11 that accepts ±5V, and is scaled by the slider potentiometer above 12 .
front panel overview 18 Odessa features two main outputs of the synthesized signal: odd partials 20 and even partials 21 . It is possible to split the harmonic spectrum so that even and odd numbered partials are separately present at those outputs yet always mixed with the fundamental partial. An additional fundamental output 22 offers a simple signal of the fundamental frequency: either a sinusoid or a square wave that can be employed for syncing other oscillators. A jumper at the back (fig.
23 32 24 26 8 fig.
cover the entire audible frequency range in exponentially spaced intervals (0.8 octave per band): below 35Hz, 35 to 63Hz, 63Hz to 113Hz, 113Hz to 204Hz, 204Hz to 367Hz, 367Hz to 661Hz, 661Hz to 1.19kHz, 1.19kHz to 2.14kHz, 2.14kHz to 3.85kHz, 3.85kHz to 6.94kHz, 6.94kHz to 12.5kHz, above 12.5kHz. Certainly, with only 12 bands it offers only a crude overview of what is going on. note: the color temperature is mapped from dB scale.
spectrum parameters The spectrum of a saw wave contains all overtones in a naturally decaying harmonic series: the amplitude of each harmonic partial is inversely proportional to its number: An=A1/n (A1 is the amplitude of the first, fundamental partial). Other popular waveshapes, like a pulse wave, have certain harmonic partials missing because their spectra are shaped by a Sinc function which introduces a series of notches: An=A1×sin(2πnβ)/(2πnβ) (β is the ratio of pulse width to length of period).
1 1 Amplitude 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 5 1 10 15 20 25 30 Partial number Amplitude 0 5 1 Amplitude 0.5 0.5 0 0 -0.5 -0.5 -1 10 15 20 25 30 Partial number Amplitude -1 0 0.5 1 1.5 fig. 4a 2 0 Time 0.5 1 1.5 fig.
1 1 Amplitude 1 Amplitude 0.8 0.8 0.8 0.6 0.6 0.6 0.4 0.4 0.4 0.2 0.2 0.2 0 5 fig. 5 10 15 20 25 30 Partial number 0 5 10 15 20 25 30 Partial number 0 Amplitude 5 10 15 20 25 30 Partial number yields a dense, rough, inharmonic cluster that resembles noise. Large negative values of tension may even result in the spectrum folding over itself to a degree where certain partials have lower frequencies than the fundamental.
1 1 Amplitude 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 1 100 200 300 400 500 Relative frequency 0 1 Amplitude 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 100 fig. 6 200 300 Amplitude 400 500 Relative frequency 100 200 300 400 500 Relative frequency 100 200 300 400 500 Relative frequency Amplitude 0 fig.
1 1 Amplitude 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 5000 1 10000 15000 20000 Frequency [Hz] 0 1 Amplitude 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 5000 fig. 8 10000 15000 Amplitude 20000 Frequency [Hz] 5 10 15 20 25 30 Partial number 10 15 20 25 30 Partial number Amplitude 0 5 fig.
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