// functia ekg furnizeaza valoarea instantanee (intre 0 si 100) a ekg-ului in pozitia px
        // px ia valori intre 1 si 150
        private int ekg(int px)
        {
            double x, l, a, b, n, harm, qrs1, qrs2, qrswav;
            x = px * 0.0045;
            l = 5;	 				// li=4
            a = 1.6; 				// a_qrswav=1.6
            b = (2 * l) / 0.09; 	// d_qrswav=0.09
            n = 100;
            qrs1 = (a / (2 * b)) * (2 - b);
            qrs2 = 0.0;
            for (int i = 1; i < n; i++)
            {
                harm = (((2 * b * a) / (i * i * 3.14 * 3.14)) * (1 - Math.Cos((i * 3.14) / b))) * Math.Cos((i * 3.14 * x) / l);
                qrs2 = qrs2 + harm;
            }
            qrswav = 60 * (1 + qrs1 + qrs2);
            return (System.Convert.ToInt32(qrswav));
        }