@audio/pitch-cepstrum

import cepstrum from '@audio/pitch-cepstrum'

Noll, 1967. Real cepstrum — $c(\tau) = \text{IFFT}(\log |\text{FFT}(x)|)$. A peak at quefrency $\tau$ corresponds to period $\tau$ in the time domain.

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

Use when: Harmonic signals where you want a clean spectral-domain method. Good pedagogical complement to time-domain algorithms.
Not for: Low-pitched signals (quefrency resolution is limited by window length).
Ref: Noll, "Cepstrum pitch determination", JASA 1967.
Requires: Power-of-2 window length — throws otherwise.

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

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