@audio/pitch-amdf

import amdf from '@audio/pitch-amdf'

Ross et al., 1974. Average Magnitude Difference Function — the classical predecessor to YIN. Measures average absolute difference between a signal and its delayed copy; minima indicate periodicity.

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

Use when: Low-complexity environments, embedded systems. Simpler and cheaper than YIN (no squaring, no cumulative normalization).
Not for: Noisy signals — lacks YIN's cumulative normalization that suppresses octave errors.
Ref: Ross et al., "Average magnitude difference function pitch extractor", IEEE TASSP 1974.
Complexity: $O(N^2/4)$.

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

MIT © audiojs