Fourier Audio Toy

Rotating epicycles draw a waveform. The same generated waveform can also be played as sound. First draft: visual presets, harmonics, speed, trace length and Web Audio output.

Paused

Audio off

Current formula

Note: the drawn Y value is treated as amplitude for audio. The sliders let you change how many sine components are included and how quickly the animation advances.

Controls

Preset

Harmonics 12

Animation speed 1.00x

Trace length 320

Base audio pitch 140 Hz

Pitch modulation 18 semitones

Audio smoothing 0.08s

Volume 15%

This is safe to drop into a static website as one HTML file. No libraries needed. Browsers require a click before audio can start.