?? vdecode.c
字號:
/**************************************************************************
*
* ROUTINE
* vdecode
*
* FUNCTION
*
* create excitation vector from code book index and decoded gain
*
* SYNOPSIS
* subroutine vdecode(decodedgain, l, vdecoded)
*
* formal
*
* data I/O
* name type type function
* -------------------------------------------------------------------
* decodedgain r i decoded gain value
* l i i pitch&code frame length
* vdecoded r o decoded excitation array
*
* external
* data I/O
* name type type function
* -------------------------------------------------------------------
* x[] float i
*
***************************************************************************
*
* CALLED BY
*
* celp
*
* CALLS
*
*
*
**************************************************************************/
#include "ccsub.h"
extern int cbindex, frame;
extern float x[MAXCODE];
void vdecode(decodedgain, l, vdecoded)
int l;
float decodedgain, vdecoded[];
{
int i, codeword;
/* *copy selected vector to excitation array */
codeword = 2 * (MAXNCSIZE - cbindex);
if (codeword < 0)
{
printf("vdecode: cbindex > MAXNCSIZE at frame %d\n", frame);
codeword = 0;
}
for (i = 0; i < l; i++)
vdecoded[i] = x[i + codeword] * decodedgain;
}
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