Fourier Audio Lab
Upload or generate → Inspect spectrum → Apply filters → Compare
Human audible frequency range:
20 Hz – 20,000 Hz
Choose input
Upload file
Default: Pure sine (440 Hz)
Default: Square wave (440 Hz)
Default: Sawtooth (440 Hz)
Default: White noise
Example: Mix of 440 Hz + 880 Hz
Example: Mix of 440 Hz + 880 Hz + 1760 Hz
Example: Mix of 440 Hz + 3000 Hz
Example: Mix of 50 Hz (low) + 3000 Hz (high)
Upload audio (wav, mp3)
Analyze & FFT
Play Original
Play Processed
A/B Toggle
Demo Sequence
Download Processed WAV
Component controls
Adjust component amplitudes, stagger playback, mute high freq.
Low
Mid
High
Stagger (ms)
Stagger play
Mute high
Filter type
None (raw)
Low-pass
High-pass
Band-pass
Band-stop
Cutoffs (Hz)
FFT size (power of two)
Upload audio or generate defaults. Presets suggest filters for clear differences.
Processed = after applying filter. Compare with Original.
Waveform (time)
Magnitude spectrum
Phase
Use staggered playback to hear components clearly. Mute high or adjust gains to isolate signals.