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@audio/spectral-pvoc

v1.0.1

Published

Phase-vocoder engine — peak-gated and peak-locked spectral bin scatter (Bernsee, Laroche-Dolson), phase locking, peak finding; powers @audio/shift-pvoc* and @audio/stretch-pvoc*

Downloads

839

Vulnerabilities

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Links

Git

Maintainers

jamenjamendfcreativedfcreativedydy

Keywords

audiodspphase-vocoderpvocpitch-shifttime-stretchspectral

Readme

@audio/spectral-pvoc

Phase-vocoder engine — the spectral scatter/lock machinery behind pitch shifting and time stretching.

Frame-level primitives over STFT magnitude/phase arrays. Pure math, no dependencies; pair with fourier-transform/stft (ana/syn hop) or @audio/stft (AMS).

import { findPeaks, scatterLocked, lockPhase, makeFrameRatio } from '@audio/spectral-pvoc'

| export | role | |---|---| | scatterGated(mag, phase, prevPhase, ratio, ctx, …scratch) | Bernsee/SMB peak-gated bin scatter — pitch shift by ratio, RMS-preserving collisions | | scatterLocked(mag, phase, prevPhase, reset, peaks, ratio, ctx, …scratch) | Laroche-Dolson rigid-ROI scatter — phase-coherent shift | | lockPhase(phase, propPhase, mag, half) | lock non-peak bins to their peak's rotation (time-stretch coherence) | | findPeaks(mag, half) / nearestPeak(peaks, k) | local-maxima peak indices + nearest lookup | | makeFrameRatio(ratio) | scalar or time-varying ratio → per-frame resolver | | wrapPhase(p) / WIN_GAIN / PI2 | phase wrap, Hann OLA gain constant |

Used by @audio/shift's pvoc/pvoc-lock/sms/formant/transient/hpss and @audio/stretch's pvoc-lock/transient. MIT.