Visualise how any signal can be decomposed into a sum of simple sine waves. Draw a custom waveform and watch spinning circles (epicycles) reconstruct it — the core idea behind Fourier analysis.
Discrete Fourier Transform decomposes a signal into frequency components. Each spinning circle represents one frequency, amplitude and phase.
Draw a shape or select a preset. Watch epicycles trace the shape. Add or remove frequency terms to see how accuracy improves.
Fourier analysis is everywhere: JPEG compression, MP3 audio, MRI scanning, seismology, speech recognition — invented by Joseph Fourier in 1822 to study heat flow.