a-weighting

    1.1.0 • Public • Published

    a-weighting Build Status unstable Greenkeeper badge

    Perform A-weighting (and others) for a frequency. Useful for creating believable spectrum images and audio measurements.

    A-weighting

    Usage

    npm install a-weighting

    var aWeight = require('a-weighting/a');
    var ft = require('fourier-transform');
     
    //get a-weighted frequencies
    var frequencies = ft(waveform).map(function (magnitude, i, data) {
        var frequency = 22050 * i / data;
     
        return aWeight(frequency) * magnitude;
    });

    Note that weight function returns normalized 0..1 weight values, it does not do decibels calculation. If you need to convert weight to decibels, do 20 * Math.log(weight) / Math.log(10).

    Implemented weights:

    Credits

    Thanks to all the specialists who researched and described these curves (years of work I guess) and wikipedia for detailed articles on this.

    Related

    Install

    npm i a-weighting

    DownloadsWeekly Downloads

    11

    Version

    1.1.0

    License

    MIT

    Last publish

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