lecs.cpp

The line echo canceller (LEC) is designed to provide the maximum attainable transparent voice qualit

/*-------------------------------------------------------------------------*
*                                                                         *
*   THIS IS AN UNPUBLISHED WORK CONTAINING CONFIDENTIAL AND PROPRIETARY   *
*   INFORMATION.  IF PUBLICATION OCCURS, THE FOLLOWING NOTICE APPLIES:    *
*      "COPYRIGHT 2001 MIKET DSP SOLUTIONS, ALL RIGHTS RESERVED"          *
*                                                                         *
*-------------------------------------------------------------------------*/
#if ! defined (_dsp)
#include <stdlib.h> // abs()
#endif

#include "stddefs.h"
#include "leci.h"

/*--------------------- local defs ----------------------------------------*/

/*--------------------- public vars ---------------------------------------*/
/*--------------------- local vars ----------------------------------------*/
/*--------------------- local functions -----------------------------------*/

/*-------------------------------------------------------------------------*/
void 					lec_rshift_adf
/*-------------------------------------------------------------------------*/
(
S16 *psAdf,
S16 sShift // > 0
)
{
    S16 k;
    S16 coef = (S16)(0x8000L >> sShift);
    S32 ac0;

    for (k = 0; k < LEC_FLT2_SZ; k++)
    {
        ac0 = psAdf[k] * (S32) coef;
        ac0 += 0x4000;
        psAdf[k] = (S16)(ac0 >> 15);
    }
}