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diff --git a/libFDK/include/autocorr2nd.h b/libFDK/include/autocorr2nd.h
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+/***************************  Fraunhofer IIS FDK Tools  ***********************
+
+                        (C) Copyright Fraunhofer IIS (2006)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):   M. Lohwasser
+   Description: fixed point abs definitions
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#ifndef _AUTOCORR_2ND_H
+#define _AUTOCORR_2ND_H
+
+
+
+#include "common_fix.h"
+
+typedef struct {
+  FIXP_DBL  r00r;
+  FIXP_DBL  r11r;
+  FIXP_DBL  r22r;
+  FIXP_DBL  r01r;
+  FIXP_DBL  r02r;
+  FIXP_DBL  r12r;
+  FIXP_DBL  r01i;
+  FIXP_DBL  r02i;
+  FIXP_DBL  r12i;
+  FIXP_DBL  det;
+  int det_scale;
+} ACORR_COEFS;
+
+#define LPC_ORDER 2
+
+
+INT
+autoCorr2nd_real (ACORR_COEFS *ac,          /*!< Pointer to autocorrelation coeffs */
+                  const FIXP_DBL *reBuffer, /*!< Pointer to to real part of spectrum */
+                  const int len             /*!< Number of qmf slots */
+                 );
+INT
+autoCorr2nd_cplx (ACORR_COEFS *ac,           /*!< Pointer to autocorrelation coeffs */
+                  const FIXP_DBL *reBuffer,  /*!< Pointer to to real part of spectrum */
+                  const FIXP_DBL *imBuffer,  /*!< Pointer to imag part of spectrum */
+                  const int len              /*!< Number of qmf slots */
+                 );
+
+
+#endif /* _AUTOCORR_2ND_H */