testprog7.c

Test del Filtro Linear-Phase Fir con cero en pi/4 para dos señales sinusoidales en pi/32 y pi/4.

Autor

Fernando Pujaico Rivera

Fecha

21-05-2011
Ademas la señal de entrada tiene una constante igual 1. La frecuencia de muestro es 2*pi.
Test de un filtro FIR.

Señal de entrada x[n].

Señal de salida y[n].

/*
 * testprog7.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)
{
        PdsLpFir *LPFIR1=NULL;
        PdsVector *h=NULL;
        PdsVector *X=NULL;
        PdsVector *Y1=NULL;
        PdsVector *Y2=NULL;
        PdsDfReal x,y;
        PdsDfNatural n,N;
        FILE *fd=NULL;
        char DATAFILE[]="datos.txt";
        char OCTAVEFILE[]="plotinoctave.m";

        N=128;

        h=pds_vector_new(2);
        X=pds_vector_new(N);
        Y1=pds_vector_new(N);
        Y2=pds_vector_new(N);
        
        /* h=[   1.70710678118655  -2.41421356237310   1.70710678118655] */
        pds_vector_set_value(h,0,1.70710678118655);     
        pds_vector_set_value(h,1,-2.41421356237310);


        LPFIR1=pds_lpfir_new(h,FALSE);
        for(n=0;n<N;n++)
        {
                x=1.0+sin(M_PI*n/32.0)+sin(M_PI*n/4.0+M_PI/16.0);
                pds_lpfir_evaluate_value(LPFIR1,x,&y);
                
                X->V[n]=x;
                Y1->V[n]=y;
        }
        pds_lpfir_free(LPFIR1);


        LPFIR1=pds_lpfir_new(h,FALSE);
        pds_lpfir_evaluate_vector(LPFIR1,X,Y2);
        pds_lpfir_free(LPFIR1);


        fd=fopen(DATAFILE,"w");
        if(fd==NULL)    return EXIT_FAILURE;
        pds_vector_fprintf(X,fd);
        pds_vector_fprintf(Y1,fd);
        pds_vector_fprintf(Y2,fd);
        fclose(fd);

        pds_octave_plot_lin(OCTAVEFILE,DATAFILE);

        pds_vector_free(Y2);    
        pds_vector_free(Y1);    
        pds_vector_free(X);     
        pds_vector_free(h);     
        return EXIT_SUCCESS;
}