diff options
Diffstat (limited to 'src/c/signalProcessing/fsfirlin/dfsfirlina.c')
| -rw-r--r-- | src/c/signalProcessing/fsfirlin/dfsfirlina.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/c/signalProcessing/fsfirlin/dfsfirlina.c b/src/c/signalProcessing/fsfirlin/dfsfirlina.c new file mode 100644 index 0000000..d2079f4 --- /dev/null +++ b/src/c/signalProcessing/fsfirlin/dfsfirlina.c @@ -0,0 +1,144 @@ +/* Copyright (C) 2017 - IIT Bombay - FOSSEE + + This file must be used under the terms of the CeCILL. + This source file is licensed as described in the file COPYING, which + you should have received as part of this distribution. The terms + are also available at + http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt + Author: Ankit Raj + Organization: FOSSEE, IIT Bombay + Email: toolbox@scilab.in + */ + +#include<stdio.h> + +#include<math.h> +#include "sincd.h" +#include "fsfirlin.h" +//#define PI 3.14159265358979 + +void dfsfirlina(double* hd,int size,double flag,double* hst) +{ + int n1=size,n; + if( n1%2==0) + { + n=2*n1; + } + else + { + n=2*n1+1; + } + double scd[8*n+1]; + //STRAT SINCD + double npt=4*n; + int sz=4*n; + double PI=M_PI; + double pas=PI/npt; + double om[sz+1]; + int i; + for(i=0;i<=sz;i++) + { + om[i]=i*pas; + } + double eps=pow(-1,(n-1)); + double s1[sz+1],s2[sz+1]; + double s[2*(sz)+1]; + double sr[2*(sz)+1]; + if(flag==1) + { + int j,k; + for(j=0;j<=4*n;j++) + { + s1[j]=sin(n*om[j]); + s2[j]=sin(om[j]); + } + s1[0]=n; + s2[0]=1; + s1[sz]=n*eps; + s2[sz]=1; + + for(k=0;k<=4*n;k++) + { + s[k]=s1[k]/s2[k]; + } + + int x; + for(x=0;x<=4*n;x++) + { + scd[sz-x]=s[x]; + } + int l; + for(l=4*n+1;l<=8*n;l++) + { + scd[l]=s[l-(sz)]; + } + int m; + for(m=0;m<=8*n;m++) + { + scd[m]=scd[m]/n; + } + } + else + { + int a; + for(a=0;a<=4*n;a++) + { + om[a]=om[a]-(PI/(2*n)); + } + int j,k; + for(j=0;j<=4*n;j++) + { + s1[j]=sin(n*om[j]); + s2[j]=sin(om[j]); + } + s1[2]=n; + s2[2]=1; + for(k=0;k<=4*n;k++) + { + s[k]=s1[k]/s2[k]; + } + int m; + for(m=0;m<=4*n;m++) + { + scd[m]=(eps*s[m])/n; + } + int l; + for(l=4*n+1;l<=8*n;l++) + { + scd[l]=s[l-(sz)]/n; + } + } + //END SINCD + int ii; + for(ii=4*n;ii<=6*n;ii++) + { + hst[ii-(4*n)]=hd[0]*scd[ii]; + } + + int epsi; + epsi=pow(-1,n-1); + int jj; + for(jj=1;jj<=(n1-1);jj++) + { + double tp1[2*n+1]; + double tp2[2*n+1]; + int k,l; + for(k=(-4*jj+4*n);k<=(-4*jj+6*n);k++) + { + tp1[k-(-4*jj+4*n)]=hd[jj]*scd[k]; + } + + for(l=(4*jj);l<=(4*jj+2*n);l++) + { + tp2[l-(4*jj)]=hd[jj]*(epsi*scd[l]); + } + int m; + for(m=0;m<=2*n;m++) + { + hst[m]=hst[m]+(tp1[m]+tp2[m]); + } + + } + + +} |