@audio/stretch-sms
v1.2.1
Published
Sinusoidal Modeling Synthesis time stretching — harmonic/tonal material
Readme
@audio/stretch-sms
Sinusoidal Modeling Synthesis (Serra 1989, McAulay-Quatieri 1986). Decomposes audio into individually tracked sinusoidal partials and resynthesizes at the new time rate — frequency and magnitude of each partial interpolated independently, no bin-by-bin smearing.
import sms from '@audio/stretch-sms'
sms(data, { factor: 2 })
sms(data, { factor: 0.5, maxTracks: 80 })| Param | Default | |
|---|---|---|
| factor | 1 | Time stretch ratio |
| frameSize | 2048 | FFT frame size |
| hopSize | frameSize/4 | Hop between frames |
| maxTracks | 60 | Max simultaneous sinusoidal tracks |
| minMag | 1e-4 | Peak detection threshold (linear) |
| freqDev | 3 | Max frequency deviation (bins) for track continuation |
| residualMix | 1 | Stochastic residual blended into output |
Use when: harmonic / tonal content — instruments, chords, vocals — where the phase vocoder smears. Not for: noise-dominated material.
Part of @audio/stretch.