The program also has the ability to add harmonics to custom waves. Just as the square wave can be built from sine tones, Fourier Analysis suggests that any sound, regardless of complexity, has an equation of sinusoids that will generate it. The more this is repeated, the ‘tighter’ the square wave becomes. To create a square wave, for example, the program will continuously call the addSine(int freq, float amp, float phase) method, where the frequency increases by two each time, and the amplitude is reduced by a third. These are achieved by adding together sine waves of varying harmonics, phases, and amplitudes. It is possible to convert the signal to a sine, square, or triangle wave. The signal class makes use linear interpolation to ensure a clean signal. Calculations and filters can be applied to the array of values without disrupting the output. For this task, however, the method returns a value from the audiosignal array - allowing a custom audiosignal array, which can changed dynamically in real-time while still being accessed by the Oscillator class. For example, for a Sinewave oscillator, the method would return (float) sin(step * 512.0). Normally, the protected value(float step) method returns a float which is taken from a predefined set. The minim ‘Oscillator’ class has been extended to allow a customisable wavetable array.

p: generate random waveform using white noise.

p: generate random waveform using perlin noise.

c: bitcrush - halves the bitrate at each keypress.

s: toggle 'autosmoothing' - continually averages out the waveform in realtime.

Requires processing 2.0+ and the minim audio library. Uses Discrete Fourier Transform (DFT) to calculate frequency response.īiquad Filter Coefficient algorithms courtesy of Patrice Tarrabia /archive.php Requirements Additive/subtractive synthesizer using Processing.

Additive vs subtractive synth