meyda
Version:
Real-time feature extraction for the web audio api
16 lines (15 loc) • 532 B
JavaScript
import { mu } from "./extractorUtilities";
export default function (_a) {
var ampSpectrum = _a.ampSpectrum;
if (typeof ampSpectrum !== "object") {
throw new TypeError();
}
var ampspec = ampSpectrum;
var mu1 = mu(1, ampspec);
var mu2 = mu(2, ampspec);
var mu3 = mu(3, ampspec);
var mu4 = mu(4, ampspec);
var numerator = -3 * Math.pow(mu1, 4) + 6 * mu1 * mu2 - 4 * mu1 * mu3 + mu4;
var denominator = Math.pow(Math.sqrt(mu2 - Math.pow(mu1, 2)), 4);
return numerator / denominator;
}