stft

stft
====
A streaming-ish short time Fourier transform.

Example

``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.

* direction 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 weight

Returns 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 require("stft")(-1, frame_size, ondata, options)`

Credits

(c) 2013 Mikola Lysenko. MIT License