+
−/*
+
−********************************************************************************
+
−*
+
−*      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             : hp_max.h
+
−*      Purpose          : Find the maximum correlation of scal_sig[] in a given
+
−*                         delay range.
+
−*
+
−********************************************************************************
+
−*/
+
−#ifndef hp_max_h
+
−#define hp_max_h "$Id $"
+
− 
+
−/*
+
−********************************************************************************
+
−*                         INCLUDE FILES
+
−********************************************************************************
+
−*/
+
−#include "typedef.h"
+
−
+
−/*
+
−********************************************************************************
+
−*                         DECLARATION OF PROTOTYPES
+
−********************************************************************************
+
−*/
+
−/*************************************************************************
+
− *
+
− *  FUNCTION:  hp_max
+
− *
+
− *  PURPOSE: Find the maximum high-pass filtered correlation of
+
− *           signal scal_sig[] in a given delay range.
+
− *
+
− *  DESCRIPTION:
+
− *      The correlation is given by
+
− *           corr[t] = <scal_sig[n],scal_sig[n-t]>,  t=lag_min,...,lag_max
+
− *      The functions outputs the maximum high-pass filtered correlation
+
− *      after normalization.
+
− *
+
− *************************************************************************/
+
−Word16 hp_max (   
+
−    Word32 corr[],      /* i   : correlation vector.                      */
+
−    Word16 scal_sig[],  /* i   : scaled signal.                           */
+
−    Word16 L_frame,     /* i   : length of frame to compute pitch         */
+
−    Word16 lag_max,     /* i   : maximum lag                              */
+
−    Word16 lag_min,     /* i   : minimum lag                              */
+
−    Word16 *cor_hp_max  /* o   : max high-pass filtered norm. correlation */
+
−    );
+
−#endif