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/*
* Copyright (C) 2004-2010 NXP Software
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "BIQUAD.h"
#include "BQ_2I_D32F32Cll_TRC_WRA_01_Private.h"
#include "LVM_Macros.h"
/**************************************************************************
ASSUMPTIONS:
COEFS-
pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1
pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2
pBiquadState->coefs[4] is -B1, these are in Q30 format
DELAYS-
pBiquadState->pDelays[0] is x(n-1)L in Q0 format
pBiquadState->pDelays[1] is x(n-1)R in Q0 format
pBiquadState->pDelays[2] is x(n-2)L in Q0 format
pBiquadState->pDelays[3] is x(n-2)R in Q0 format
pBiquadState->pDelays[4] is y(n-1)L in Q0 format
pBiquadState->pDelays[5] is y(n-1)R in Q0 format
pBiquadState->pDelays[6] is y(n-2)L in Q0 format
pBiquadState->pDelays[7] is y(n-2)R in Q0 format
***************************************************************************/
void BQ_2I_D32F32C30_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
LVM_INT32 *pDataIn,
LVM_INT32 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 ynL,ynR,templ,tempd;
LVM_INT16 ii;
PFilter_State pBiquadState = (PFilter_State) pInstance;
for (ii = NrSamples; ii != 0; ii--)
{
/**************************************************************************
PROCESSING OF THE LEFT CHANNEL
***************************************************************************/
/* ynL= ( A2 (Q30) * x(n-2)L (Q0) ) >>30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[2],ynL,30)
/* ynL+= ( A1 (Q30) * x(n-1)L (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[0],templ,30)
ynL+=templ;
/* ynL+= ( A0 (Q30) * x(n)L (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[2],*pDataIn,templ,30)
ynL+=templ;
/* ynL+= (-B2 (Q30) * y(n-2)L (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[6],templ,30)
ynL+=templ;
/* ynL+= (-B1 (Q30) * y(n-1)L (Q0) ) >> 30 in Q0 */
MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[4],templ,30)
ynL+=templ;
/**************************************************************************
PROCESSING OF THE RIGHT CHANNEL
***************************************************************************/
/* ynR= ( A2 (Q30) * x(n-2)R (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[3],ynR,30)
/* ynR+= ( A1 (Q30) * x(n-1)R (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[1],templ,30)
ynR+=templ;
/* ynR+= ( A0 (Q30) * x(n)R (Q0) ) >> 30 in Q0*/
tempd=*(pDataIn+1);
MUL32x32INTO32(pBiquadState->coefs[2],tempd,templ,30)
ynR+=templ;
/* ynR+= (-B2 (Q30) * y(n-2)R (Q0) ) >> 30 in Q0*/
MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[7],templ,30)
ynR+=templ;
/* ynR+= (-B1 (Q30) * y(n-1)R (Q0) ) >> 30 in Q0 */
MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[5],templ,30)
ynR+=templ;
/**************************************************************************
UPDATING THE DELAYS
***************************************************************************/
pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
pBiquadState->pDelays[5]=(LVM_INT32)ynR; /* Update y(n-1)R in Q0*/
pBiquadState->pDelays[4]=(LVM_INT32)ynL; /* Update y(n-1)L in Q0*/
pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
pDataIn++;
pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
pDataIn++;
/**************************************************************************
WRITING THE OUTPUT
***************************************************************************/
*pDataOut=(LVM_INT32)ynL; /* Write Left output in Q0*/
pDataOut++;
*pDataOut=(LVM_INT32)ynR; /* Write Right ouput in Q0*/
pDataOut++;
}
}
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