example1a.c

Ejemplo de uso del Filtro Iir con cero en -1 y polo en 0.9, para una señal sinusoidal con frecuencia (angular) en pi/32, 3*pi/4, y una componente constante igual 1.

Autor

Fernando Pujaico Rivera

Fecha

21-05-2011
Test de un filtro IIR.

El filtro usado será:

Señal de entrada x[n].

Señal de salida y[n].

/*
 * example1a.c
 * 
 * Copyright 2011 Fernando Pujaico Rivera <fernando.pujaico.rivera@gmail.com>
 * 
 * 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., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 */


#include <config.h>
#include <stdlib.h>
#include <pds/pdsdf.h>
#include <pds/pdsvector.h>
#include "extras.h"
#include <math.h>

int main(int argc, char** argv)
{
        PdsIir *IIR1=NULL;
        PdsVector *hden=NULL;
        PdsVector *hnum=NULL;

        PdsDfReal x,y;
        PdsDfNatural n,N;

        PdsVector *X=NULL;
        PdsVector *Y=NULL;

        //-------------------------- Creando filtro IIR --------------------------//

        // hnum=[ 1/20 1/20] 
        hnum=pds_vector_new_args(2, 1/20.0,1/20.0);
        // hden=[1.0 -0.9]
        hden=pds_vector_new_args(2,   1.0,   -0.9);

        IIR1=pds_iir_new(hnum,hden);

        //------------------------------- Filtrando ------------------------------//

        N=128;
        X=pds_vector_new(N);
        Y=pds_vector_new(N);

        for(n=0;n<N;n++)
        {
                x=1.0+sin(M_PI*n/32.0)+sin(3.0*M_PI*n/4.0+M_PI/16.0);
                pds_iir_evaluate_value(IIR1,x,&y);

                X->V[n]=x;
                Y->V[n]=y;
        }


        //-------------------------- Plotando resultados -------------------------//

    pds_vector_octave_png_plot(NULL,X,"n","X",NULL,"example1ax.png");
    pds_vector_octave_png_plot(NULL,Y,"n","Y",NULL,"example1ay.png");

        //---------------------------- Limpiando todo ----------------------------//
        
        pds_vector_free(hnum);  
        pds_vector_free(hden);
        pds_iir_free(IIR1);

        return EXIT_SUCCESS;
}