Short time Fourier transform
npm install @alexanderlee/stftstft
====
A streaming-ish short time Fourier transform.
javascript
var shortTimeFT = require("stft")
function onFreq(re, im) {
//Frequency stuff. Process it here
istft(re, im)
}
function onTime(v) {
//Got data, emit it here
console.log("out frame:", v)
}
var stft = shortTimeFT(1, 1024, onFreq)
var istft = shortTimeFT(-1, 1024, onTime)
//Feed stuff into signal
stft(new Float32Array([1, 0, 0, 0, ... ])
`Install
npm install stft
$3
Creates a function for processing a signal with a short time Fourier transform.*
is a flag that determines whether the stft is forward or inverse
* frame_size is the size of a frame for the stft
* ondata is a callback that gets fired whenever data is ready to be processed
* options is an optional object that takes the following parameters +
options.hop_size the amount of samples between stft hops
+ options.window_func a windowing function, which takes a parameter from [0,1] and returns a weightReturns A function that can be called with a frame (either real or complex) that adds a chunk of data to the stft queue
$3
Short cut for require("stft")(1, frame_size, ondata, options)$3
Short cut for