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Diffstat (limited to 'src/signalProcessing/lev/dleva.c')
-rw-r--r-- | src/signalProcessing/lev/dleva.c | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/src/signalProcessing/lev/dleva.c b/src/signalProcessing/lev/dleva.c deleted file mode 100644 index 49f757c8..00000000 --- a/src/signalProcessing/lev/dleva.c +++ /dev/null @@ -1,70 +0,0 @@ -/* - * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab - * Copyright (C) 2008 - INRIA - Arnaud TORSET - * - * 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 - * - */ - - -/*Resolve the Yule-Walker equations: - - |r(0) r(1) ... r(N-1)|| a(1) | |sigma2| - |r(1) r(0) ... r(n-1)|| a(2) | | 0 | - | : : ... : || : |=| 0 | - | : : ... : || : | | 0 | - |r(N-1) r(N-2) ... r(0) ||a(N-1)| | 0 | - - using Levinson's algorithm. - r :Correlation coefficients - ar :Auto-Regressive model parameters - sigma2 :Scale constant - rc :Reflection coefficients -*/ - - -#include "lev.h" -#include "malloc.h" -#include "stdlib.h" - - -double dleva(double* in,int size, double* ar, double* rc){ - int i=0, j=0; - double accu=0; - double* ak1; - double sigma2; - - /* FIXME : malloc here */ - ak1=(double*)malloc((unsigned int)size*sizeof(double)); - - /* initialize levinson's algorithm */ - ar[0]=-in[1]/in[0]; - rc[0]=ar[0]; - sigma2=(1-ar[0]*ar[0])*in[0]; - ak1[0]=0; - - /* iterative solution to yule-walker equations */ - for (i=1;i<size-1;i++){ - accu=0; - for (j=0;j<i;j++){ - accu+=ar[j]*in[i-j]; - } - ak1[i]=-(in[i+1]+accu)/(sigma2); - rc[i]=ak1[i]; - for (j=0;j<i;j++){ - ak1[j] = ar[j]+ak1[i]*ar[i-1-j]; - } - sigma2=(1-ak1[i]*ak1[i])*(sigma2); - for (j=0;j<=i;j++){ - ar[j]=ak1[j]; - } - } - free(ak1); - return sigma2; -} - - |