@audio/stretch-hybrid

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