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phase vocoder (Laroche-Dolson) pitch shift","maintainers":[{"name":"jamen","email":"jamenmarz@gmail.com"},{"name":"dfcreative","email":"df.creative@gmail.com"},{"name":"dy","email":"df.creative@gmail.com"}],"readme":"# @audio/shift-pvoc-lock [](https://www.npmjs.com/package/@audio/shift-pvoc-lock) [](https://github.com/krishnized/license)\n\nPeak-locked phase vocoder (Laroche-Dolson) pitch shift\n\n```\nnpm install @audio/shift-pvoc-lock\n```\n\n```js\nimport phaseLock from '@audio/shift-pvoc-lock'\n```\n\nLaroche-Dolson peak-locked phase vocoder. Peaks scatter to shifted bins; non-peak bins lock their phase relative to the nearest peak, keeping the vertical phase relationship inside each sinusoidal lobe intact.\n\n```js\nphaseLock(audio, { ratio: 1.5 })\n```\n\n**Preserves** phase coherence around peaks, partial structure.
\n**Destroys** transients (still smeared, less than `vocoder`), formants.\n\n| f0 err | THD% | alias | attack corr | formant dist | phase coh | shift |\n|-------:|-----:|------:|------------:|-------------:|----------:|------:|\n| 0.00 | 0.0 | 0.000 | 0.984 | 1.423 | 0.999 | 1.755 |\n\n**Use when:** General music — the \"try this first\" phase vocoder.
\n**Not for:** Music with drums (use `transient`), voice (use `formant`).\n\n## Stream\n\n```js\nlet write = phaseLock({ ratio: 1.5 })\nlet out = write(inputBlock)\nlet tail = write() // flush\n```\n\n`phaseLock` streams per-frame: each `write(chunk)` call renormalizes and emits audio as soon as a frame completes, and re-chunking the same input differently reproduces the batch output byte for byte.\n\n## Data\n\nInput is a `Float32Array` (mono) or an array of `Float32Array` channels (`[left, right, ...]`) — anything else throws `TypeError`. `ratio` also accepts a function `t => ratio` (seconds from stream start) or a `Float32Array` breakpoint envelope (resampled across the input via `ratioDuration`, default the input's own duration) for time-varying pitch.\n\n---\n\nPart of [@audio/shift](https://github.com/audiojs/shift) — the shift family umbrella. This README is generated from the umbrella docs.\n\nMIT © [audiojs](https://github.com/audiojs)\n","readmeFilename":"README.md"}