gibberish-dsp/js/oscillators/brownnoise.dsp.js

Gibberish is designed to be an optimized API for audio synthesis using per-sample techniques.

const genish = require( 'genish.js' ),
      ssd = genish.history,
      noise = genish.noise

module.exports = function() {
  "use jsdsp"

  const last = ssd( 0 )

  const white = ( noise() * 2 ) - 1

  let out = (last.out + (.02 * white)) / 1.02

  last.in( out )

  out *= 3.5
   
  return out
}