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Computes true instantaneous frequency per bin from consecutive-frame phase advance, scatters peaks to shifted bins, accumulates synthesis phase at the shifted frequency.\n\n```js\nvocoder(audio, { ratio: 1.5 })\n```\n\n**Preserves** dominant-partial pitch, long-horizon phase per bin.
\n**Destroys** transients, vertical phase coherence (\"phasiness\"), formants.\n\n| f0 err | THD% | alias | attack corr | formant dist | phase coh | shift |\n|-------:|-----:|------:|------------:|-------------:|----------:|------:|\n| 0.00 | 0.0 | 0.000 | 0.981 | 1.158 | 0.928 | 1.553 |\n\nPhase coh 0.928 from independent per-bin phase accumulation — no inter-bin locking. Best shift score among the general phase vocoders — the simpler scatter avoids the peak-locked family's own assignment overhead on these fixtures.\n\n**Use when:** Simple tonal material, educational baseline.
\n**Not for:** Music with percussion, voice.\n\n## Stream\n\n```js\nlet write = vocoder({ ratio: 1.5 })\nlet out = write(inputBlock)\nlet tail = write() // flush\n```\n\n`vocoder` 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"}