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diff --git a/2.3-1/src/c/signalProcessing/includes/lpc2cep.h b/2.3-1/src/c/signalProcessing/includes/lpc2cep.h
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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
+ *
+ */
+
+#ifndef __LPC2CEP_H__
+#define __LPC2CEP_H__
+
+#include "dynlib_signalprocessing.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+/* Matrices on input are squared because matricial logarithm 
+   works only with squared matrices (and logm is used in lcp2cep)
+   So we just have to pass one parametre on input for the size of
+   the input matrix, this parametre is size and it's the numbers of
+   rows(or columns)
+*/
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+EXTERN_SIGPROC void slpc2cepa(float* in, int size, float* out);
+
+EXTERN_SIGPROC void dlpc2cepa(double* in, int size, double* out);
+
+EXTERN_SIGPROC void clpc2cepa(floatComplex* in, int size, floatComplex* out);
+
+EXTERN_SIGPROC void zlpc2cepa(doubleComplex* in, int size, doubleComplex* out);
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*__LPC2CEP_H__*/
+