/*
 * Copyright (c) 2003, Giuseppe Gottardi 'oveRet' <gottardi@ailinux.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <common.h>
#include <modulation.h>


extern int bark;
extern double *fC;

int
modulation(double *E2, int rate, struct modulationin *in, double *Mod)
{
    int k;
    double T, a;

    for(k=0;k<bark;k++) {
	T = (double)Tmin + (double)(100/fC[k])*(double)(T100- Tmin);
	a = exp((double)-HANN/(2*rate * T));
	in->Edertmp[k] = in->Edertmp[k]*a+(1-a)*(double)(rate/(HANN/2))
			 *module(p(E2[k], 0.3) - p(in->E2tmp[k], 0.3));
	in->E2tmp[k] = E2[k];
	in->Etildetmp[k] = a*in->Etildetmp[k]+(1-a)*p(E2[k], 0.3);
	Mod[k] = in->Edertmp[k]/(1 + (in->Etildetmp[k]/0.3));
    }

    return 0;
}