+
−/*
+
−********************************************************************************
+
−*
+
−*      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             : lsp.h
+
−*      Purpose          : Conversion from A(z) to LSP. Quantization and
+
−*                         interpolation of LSPs.
+
−*
+
−********************************************************************************
+
−*/
+
−#ifndef lsp_h
+
−#define lsp_h "$Id $"
+
− 
+
−/*
+
−********************************************************************************
+
−*                         INCLUDE FILES
+
−********************************************************************************
+
−*/
+
−#include "tw_amr.h"
+
−#include "typedef.h"
+
−#include "q_plsf.h"
+
−
+
−/*
+
−********************************************************************************
+
−*                         LOCAL VARIABLES AND TABLES
+
−********************************************************************************
+
−*/
+
−
+
−/*
+
−********************************************************************************
+
−*                         DEFINITION OF DATA TYPES
+
−********************************************************************************
+
−*/
+
−typedef struct {
+
−   /* Past LSPs */
+
−   Word16 lsp_old[M];
+
−   Word16 lsp_old_q[M];
+
−
+
−   /* Quantization state */
+
−   Q_plsfState qSt;
+
−} lspState;
+
−
+
−/*
+
−********************************************************************************
+
−*                         DECLARATION OF PROTOTYPES
+
−********************************************************************************
+
−*/
+
− 
+
−/*
+
−**************************************************************************
+
−*
+
−*  Function    : lsp_reset
+
−*  Purpose     : Resets state memory
+
−*  Returns     : 0 on success
+
−*
+
−**************************************************************************
+
−*/
+
−void lsp_reset (lspState *st);
+
−
+
−/*
+
−**************************************************************************
+
−*
+
−*  Function    : lsp
+
−*  Purpose     : Conversion from LP coefficients to LSPs.
+
−*                Quantization of LSPs.
+
−*  Description : Generates 2 sets of LSPs from 2 sets of
+
−*                LP coefficients for mode 12.2. For the other
+
−*                modes 1 set of LSPs is generated from 1 set of
+
−*                LP coefficients. These LSPs are quantized with
+
−*                Matrix/Vector quantization (depending on the mode)
+
−*                and interpolated for the subframes not yet having
+
−*                their own LSPs.
+
−*                
+
−**************************************************************************
+
−*/
+
−int lsp(lspState *st,        /* i/o : State struct                            */
+
−        enum Mode req_mode,  /* i   : requested coder mode                    */
+
−        enum Mode used_mode, /* i   : used coder mode                         */        
+
−        Word16 az[],         /* i/o : interpolated LP parameters Q12          */
+
−        Word16 azQ[],        /* o   : quantization interpol. LP parameters Q12*/
+
−        Word16 lsp_new[],    /* o   : new lsp vector                          */ 
+
−        Word16 **anap        /* o   : analysis parameters                     */
+
−        );
+
−
+
−#endif