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Radial Sound Equalizer: Real FFT Spectrum Analyzer (2D)

2D companion to the 3D radial equalizer: a genuine additive synthesizer feeds a real radix-2 FFT, so every bar height is a computed frequency-bin magnitude — not a scripted animation — with a live Parseval energy check and THD readout.

Sound & Music2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

This 2D companion replaces the 3D version's scripted "beat envelope" bars with a genuine additive synthesizer driving a real radix-2 FFT: fundamental frequency, harmonic count, harmonic rolloff and noise level are all live inputs, a window-function selector controls spectral leakage, and every bar in the radial and linear panes is an actual computed frequency-bin magnitude — cross-checked every frame by a Parseval energy-conservation readout so the transform's correctness is directly visible, not just asserted.

⚙ Under the hood

2D companion to the 3D radial equalizer: a genuine additive synthesizer feeds a real radix-2 FFT, so every bar height is a computed frequency-bin magnitude, with a live Parseval energy check and THD readout.

fast fourier transformspectrum analyzeradditive synthesisparseval theoremharmonic distortionsignal processing

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install