a-weighting

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

| Export | Standard | Description | |--------|----------|-------------| | a | A-weighting | General noise measurement | | b | B-weighting | Moderate loudness | | c | C-weighting | High loudness | | d | D-weighting | Aircraft noise | | m | ITU-R 468 | Telecommunications | | z | Z-weighting | Flat (unity gain) |

See also

• audio-filter - Audio filters including IIR A/C/K weighting for sample processing.
• Equal-loudness contours