www.pudn.com > CryptoPhone-src-031122.zip > con_stch.c

/* Copyright 2001,2002,2003 NAH6 
 * All Rights Reserved 
 * 
 * Parts Copyright DoD, Parts Copyright Starium 
 * 
 */ 
 
#include "main.h" 
#include "con_stch.h" 
#include  
 
extern float StochCB[1082];	/* This is defined in stoch.c */ 
 
/************************************************************************** 
*                                                                         * 
* ROUTINE 
*		CalcStoch 
* 
* FUNCTION 
*		Calculate Stochastic codebook contribution to synthesis 
*		from code book index and gain 
* 
* SYNOPSIS 
*		CalcStoch(s_index, s_gain, vector) 
* 
*   formal 
* 
*                       data    I/O 
*       name            type    type    function 
*       ------------------------------------------------------------------- 
*	s_index		int	 i	stochastic codebook index 
*	s_gain		int	 i	stochastic codebook gain 
*	vector		int	 o	vector from stochastic codebook 
* 
**************************************************************************/ 
void ConstructStochCW( 
int	s_index, 
float	s_gain, 
float	vector[SF_LEN]) 
{ 
 
int	codeword; 
int 	i; 
 
/*  Copy selected vector to excitation array */ 
	codeword = 2 * (MAX_STOCH_CB_SIZE - s_index); 
	if (codeword < 0) 
	{ 
	  printf("ConstructStochCW: Error in codeword calculation\n"); 
	  codeword = 0; 
	} 
	for (i = 0; i < SF_LEN; i++) 
	  vector[i] = StochCB[i + codeword] * s_gain; 
 
 
}