meyda

Version:

Real-time feature extraction for the web audio api

14 lines (13 loc) • 466 B

JavaScript

import { mu } from "./extractorUtilities";
export default function (_a) {
    var ampSpectrum = _a.ampSpectrum;
    if (typeof ampSpectrum !== "object") {
        throw new TypeError();
    }
    var mu1 = mu(1, ampSpectrum);
    var mu2 = mu(2, ampSpectrum);
    var mu3 = mu(3, ampSpectrum);
    var numerator = 2 * Math.pow(mu1, 3) - 3 * mu1 * mu2 + mu3;
    var denominator = Math.pow(Math.sqrt(mu2 - Math.pow(mu1, 2)), 3);
    return numerator / denominator;
}