@audio/pitch-swipe

SWIPE′ — Sawtooth Waveform Inspired Pitch Estimator with prime harmonics

npm install @audio/pitch-swipe

import swipe from '@audio/pitch-swipe'

Camacho & Harris, 2008. SWIPE' (Sawtooth Waveform Inspired Pitch Estimator, prime harmonics). Measures spectral similarity between the window and a sawtooth template whose lobes sit at prime harmonics. More accurate than HPS on clean instrumental signals; robust against octave errors because only prime harmonics contribute.

Simplified single-window form: uses one FFT instead of the multi-resolution loudness pyramid of the original paper — sufficient for stationary windows.

let result = swipe(samples, { fs: 44100 })

| Param | Default | | |---|---|---| | fs | 44100 | Sample rate (Hz) | | minFreq | 60 | Minimum detectable frequency (Hz) | | maxFreq | 4000 | Maximum detectable frequency (Hz) | | cents | 10 | Candidate spacing in cents | | threshold | 0.15 | Minimum clarity to accept |

Use when: Clean instrumental signals, studio recordings, where sub-Hz accuracy matters. Not for: Very noisy or reverberant signals (single-window form lacks multi-resolution robustness of the full SWIPE'). Ref: Camacho & Harris, "A sawtooth waveform inspired pitch estimator for speech and music", JASA 2008. Requires: Power-of-2 window length — throws otherwise.

Part of @audio/pitch — the pitch family umbrella. This README is generated from the umbrella docs.

MIT © audiojs