@audio/hybrid
Status calibrated
npm1.2.3licenseMIT
Hybrid harmonic/percussive time stretch (Driedger) — HPSS split, phase-locked vocoder + OLA per layer
Overview
- Install
- Updated
- Family
- stretch, 10 packages under it
- Tags
- time & pitch
Hybrid harmonic/percussive time stretch (Driedger & Müller). Median-filter HPSS splits the spectrogram into a harmonic and a percussive layer; the harmonic layer goes through the phase-locked vocoder, the percussive layer through short-frame OLA — chords stay coherent and attacks stay sharp, where a single algorithm must trade one for the other.
import hybrid from '@audio/stretch-hybrid'
let out = hybrid(data, { factor: 2 })
| Param | Default | |
|---|---|---|
factor |
1 |
Time stretch ratio |
frameSize |
2048 |
FFT size for HPSS + harmonic path |
hopSize |
frameSize/4 |
Hop between frames |
percFrame |
512 |
OLA frame for the percussive layer |
harmMedian |
17 |
Median filter across time (frames) |
percMedian |
17 |
Median filter across frequency (bins) |
Use when: full mixes — drums over tonal material.
Cost: separation + two stretches ≈ 4–6× the CPU of @audio/stretch-pvoc-lock alone; on purely tonal or purely percussive material the single-path algorithms match it for less.
Part of @audio/stretch.
License
MIT · ॐ