/************************************************************************ Copyright (C) 2000-2005 Trolltech AS and its licensors.** All rights reserved.**** This file is part of the Qtopia Environment.**** This file may be distributed and/or modified under the terms of the** GNU General Public License version 2 as published by the Free Software** Foundation and appearing in the file LICENSE.GPL included in the** packaging of this file.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.**** See http://www.trolltech.com/gpl/ for GPL licensing information.** See below for additional copyright and license information**** Contact info@trolltech.com if any conditions of this licensing are** not clear to you.************************************************************************//***********************************************************************************      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001*                                R99   Version 3.3.0                *                                REL-4 Version 4.1.0                ***********************************************************************************      File             : autocorr.h*      Purpose          : Compute autocorrelations of signal with windowing**********************************************************************************/#ifndef autocorr_h#define autocorr_h "$Id $" /**********************************************************************************                         INCLUDE FILES*********************************************************************************/#include "typedef.h" /**********************************************************************************                         DEFINITION OF DATA TYPES*********************************************************************************/ /**********************************************************************************                         DECLARATION OF PROTOTYPES*********************************************************************************//*****************************************************************************  Function    : autocorr*  Purpose     : Compute autocorrelations of signal with windowing*  Description : - Windowing of input speech:   s'[n] = s[n] * w[n]*                - Autocorrelations of input speech:*                  r[k] = sum_{i=k}^{239} s'[i]*s'[i-k]    k=0,...,10*                The autocorrelations are expressed in normalized *                double precision format.*  Returns     : Autocorrelation****************************************************************************/Word16 Autocorr (    Word16 x[],        /* (i)    : Input signal (L_WINDOW)             */    Word16 m,          /* (i)    : LPC order                           */    Word16 r_h[],      /* (o)    : Autocorrelations  (msb)  (MP1)      */    Word16 r_l[],      /* (o)    : Autocorrelations  (lsb)  (MP1)      */    const Word16 wind[]/* (i)    : window for LPC analysis. (L_WINDOW) */); #endif