audio-noise

Fill array or audio-buffer with defined type of noise.

let createNoise = require('audio-noise')

let noise = createNoise('pink')

//create array filled with pink noise
let arr = noise(Array(1024))

createNoise(color|options?)

Create noise generator of specific color or based on options.

options

Property	Default	Meaning
type, color	'white'	Color of noise.
sampleRate	44100	Output data sample rate.
channels	1	Output data number of channels.
samplesPerFrame	1024	Default length of the block.
format	'float32'	Output data format, eg. 'uint8 interleaved', 'float32 planar', 'array', 'audiobuffer' etc. See pcm-convert and audio-format for list of available formats.

color or options.color

Value	Spectrum	Description
'white'		Flat spectrum noise. See wiki.
'pink'		-3dB/octave. See wiki.
'brown'		-6dB/octave. See wiki.
'blue'		TODO +3dB/octave.
'violet'		TODO +6dB/octave.
'grey'		TODO White noise weighted by loudness curve, see a-weighting. Also see wiki
'green'		TODO

noise(target|length?)

Fill passed audio-buffer or array with noise. Buffer is modified in-place.

const write = require('web-audio-write')()
const noise = require('./')({color: 'white', format: 'stereo audiobuffer'})

;(function tick(err) {
	if (err) throw err
	write(noise(), tick)
})()

Related

• pull-audio-noise − audio-noise pull-stream source
• audio-noise-stream − audio-noise readable node stream

See also

• Colors of Noise − digest of colors of noise.
• white-noise-node, pink-noise-node, brown-noise-node − Web Audio API noise source nodes.

License

© 2017 Dmitry Yvanov @ audiojs. MIT License