audio-oscillator 
Generate periodic oscillation data.
Usage
const oscillate = require('audio-oscillator/sine')
const output = require('web-audio-write')()
// render sine sound stream
let buf = new AudioBuffer({ channels: 2, sampleRate: 44100, length: 1024 })
;(async function frame() {
await output(oscillate(buf, { frequency: 440 })))
frame()
})()API
let array = oscillate.<waveform>(length|dst, frequency=440|options?)
Generate periodic-function waveform samples into a dst float array / array of arrays / AudioBuffer. If length is provided, a new mono array is created. The phase of consequently generated chunks is aligned, if the same array is passed multiple times.
let oscillate = require('audio-oscillator')
let samples = new Float64Array(1024)
oscillate.sine(samples, 440)
// output array has additional properties of the data
// samples.phase, samples.frequency, samples.detune, samples.sampleRate
// next data phase is aligned with the previous data
oscillate.sine(samples)options
| Property | Default | Meaning |
|---|---|---|
frequency, f |
440 |
Frequency of oscillations, in Hz. |
detune |
0 |
Detune of oscillations -100...+100, in cents. |
phase, t |
0 |
Normalized initial phase of waveform, 0..1. |
sampleRate, rate |
44100 |
Sample rate of output data. |
waveform
Available waveforms with their additional options:
| Type | Waveshape | Parameters |
|---|---|---|
'sin' |
 |
|
'cos' |
 |
|
'saw' |
 |
inverse=false |
'tri' |
 |
ratio=0.5 |
'rect' |
 |
ratio=0.5 |
'series' |
 |
real=[0, 1], imag=[0, 0], normalize=true |
'clausen' |
 |
limit=10 |
'step' |
 |
samples=10 |
Related
- periodic-function − a collection of periodic functions.
License
© 2017 Dmitry Yv. MIT License