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-rw-r--r--src/signalProcessing/lev/cleva2.c85
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diff --git a/src/signalProcessing/lev/cleva2.c b/src/signalProcessing/lev/cleva2.c
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--- a/src/signalProcessing/lev/cleva2.c
+++ /dev/null
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-/*
- * 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"
-#include "conj.h"
-#include "multiplication.h"
-#include "addition.h"
-#include "division.h"
-#include "subtraction.h"
-
-
-floatComplex cleva2(floatComplex* in,int size, floatComplex* ar){
- int i=0, j=0;
- floatComplex accu=FloatComplex(0,0);
- floatComplex* ak1;
- floatComplex temp;
- floatComplex sigma2;
-
- /* FIXME : malloc here */
- ak1=(floatComplex*)malloc((unsigned int)size*sizeof(floatComplex));
-
- /* initialize levinson's algorithm */
- temp=crdivs(in[1],in[0]);
- ar[0]=FloatComplex(-creals(temp),-cimags(temp));
-
- temp = cmuls(ar[0],cconjs(ar[0]));
- sigma2=cmuls(cdiffs(FloatComplex(1,0), temp), in[0]);
-
- ak1[0]=FloatComplex(0,0);
-
- /* iterative solution to yule-walker equations */
- for (i=1;i<size-1;i++){
- accu=FloatComplex(0,0);
- for (j=0;j<i;j++){
- temp = cmuls(cconjs(ar[j]),cconjs(in[i-j]));
- accu=cadds(accu, temp);
- }
- temp = cadds(in[i+1],accu);
- temp = crdivs(temp,sigma2);
- ak1[i]=FloatComplex(-creals(temp),-cimags(temp));
-
-
- for (j=0;j<i;j++){
- temp = cmuls(ak1[i], cconjs(ar[i-1-j]));
- ak1[j] = cadds(ar[j],temp);
- }
-
- temp = cmuls(ak1[i], cconjs(ak1[i]));
- temp = cdiffs(FloatComplex(1,0),temp);
- sigma2 = cmuls(temp,sigma2);
- for (j=0;j<=i;j++){
- ar[j]=FloatComplex(creals(ak1[j]),cimags(ak1[j]));
- }
- }
- free(ak1);
- return sigma2;
-}