@audio/spectral-freeze

Spectral freeze — sustain one spectral frame indefinitely, phase advanced per bin with random dispersion against buzz (Ableton Spectral Time / Paulstretch-freeze class).

npm install @audio/spectral-freeze

import freeze from '@audio/spectral-freeze'

let out = freeze(data, { fs: 44100, at: 1.5, duration: 4, frameSize: 4096 })
// Float32Array(round(duration * fs)) — new audio, the frame at `at` sustained for `duration` seconds

Takes the magnitude spectrum of one analysis frame (windowed at at), then resynthesizes it hop by hop: each bin's phase advances by its own bin frequency plus a small random offset (seeded by seed), so the sustained tone doesn't beat/buzz from perfectly periodic phase increments the way a naive frame-repeat would.

Options: - fs — sample rate (default 44100, Hz) · at — frame to freeze, seconds (default 0) · duration — output length, seconds (default 2) · frameSize — STFT frame (default 4096) · seed — phase-dispersion RNG seed (default 1, deterministic)

Use when: pad/drone textures from a single frozen instant, spectral "hold" effects — not a general time-stretch (use @audio/spectral-pvoc / @audio/stretch for that).

Part of @audio/spectral.