meyda/dist/node/extractors/spectralFlatness.js

Real-time feature extraction for the web audio api

'use strict';

function spectralFlatness (_a) {
    var ampSpectrum = _a.ampSpectrum;
    if (typeof ampSpectrum !== "object") {
        throw new TypeError();
    }
    var numerator = 0;
    var denominator = 0;
    for (var i = 0; i < ampSpectrum.length; i++) {
        numerator += Math.log(ampSpectrum[i]);
        denominator += ampSpectrum[i];
    }
    return ((Math.exp(numerator / ampSpectrum.length) * ampSpectrum.length) /
        denominator);
}

module.exports = spectralFlatness;