sbr-crystalizer.js demo

Pick a low-quality voice recording (or use the built-in synthetic one), press Crystalize, then compare. Everything runs in your browser; nothing is uploaded.

Cutoff Manual cutoff: 4000 Hz Strength: 0.85 Tilt: 11 dB/oct double the sample rate (≤24 kHz input)

No audio loaded.

Original

Spectrogram, 0 to Nyquist, bright = louder.

Processed

This is a perceptual enhancer: it adds a plausible top end, it cannot recover information the recording has lost. Read the README.