a-weighting

A/B/C-weighting and ITU-R 468 have moved to @audio/weighting — @audio/weighting-{a,b,c,itu468} are actual audio-processing filters (not just magnitude curves) and also expose .response(f) for the same magnitude query this package provides. D-weighting and flat Z-weighting have no @audio/weighting equivalent yet — this package remains the reference for those two.

Standard frequency weighting curves (IEC 61672, ITU-R 468) for approximating equal-loudness contours of human ear.

Usage

import { a } from 'a-weighting'

// apply a-weighting to frequency spectrum
let weighted = frequencies.map((magnitude, i, data) => {
  let frequency = 22050 * i / data.length
  return a(frequency) * magnitude
})

Returns normalized 0..1 weight values, not decibels. To convert: 20 * Math.log10(weight).

Weights

See also

• @audio/weighting - IIR A/B/C/K/ITU-468/RIAA weighting filters for sample processing (.response(f) for the magnitude curve).
• Equal-loudness contours

MIT · ॐ