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    fft-windowing

    0.1.4 • Public • Published

    nodejs-fft-windowing is a node.js module that applies a windowing function to an array of data, making it ready to be FFT'd.

    This article by National Instruments gives a good introduction to why windowing functions are useful.

    Installation

    If you have npm installed, just run:

    npm install fft-windowing
    

    Usage

    The Hann (Hanning) window is a good general-purpose window. You would use it like so:

    var windowing = require('fft-windowing');
     
    var raw = [2, 2, 0, -2, -2, 0, 2, 2];
     
    var windowed = windowing.hann(raw);
     

    The resulting windowed variable is then ready to be fed through a Fast Fourier Transform. A good node.js module to use would be this one.

    The following windows are available:

    The following windows can also accept an extra parameter, alpha:

    You would use it like this:

    var windowing = require('fft-windowing');
     
    var raw = [2, 2, 0, -2, -2, 0, 2, 2];
     
    var windowed = windowing.kaiser(raw, 0.5);
     

    Tests

    Run node tests/fft-windowing-tests.js. This should generate a file called fft-windowing.pdf in the root directory which shows what happens if you apply each windowing function to a uniform array.

    LICENSE

    MIT

    Keywords

    none

    Install

    npm i fft-windowing

    DownloadsWeekly Downloads

    119

    Version

    0.1.4

    License

    MIT

    Last publish

    Collaborators

    • richardeoin