void BQ_1I_D16F32C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
LVM_INT16 *pDataIn,
LVM_INT16 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 ynL,templ;
LVM_INT16 ii;
PFilter_State pBiquadState = (PFilter_State) pInstance;
for (ii = NrSamples; ii != 0; ii--)
{
/**************************************************************************
PROCESSING OF THE LEFT CHANNEL
***************************************************************************/
// ynL=A2 (Q14) * x(n-2)L (Q0) in Q14
ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[1];
// ynL+=A1 (Q14) * x(n-1)L (Q0) in Q14
ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0];
// ynL+=A0 (Q14) * x(n)L (Q0) in Q14
ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn);
// ynL+= ( (-B2 (Q14) * y(n-2)L (Q16) )>>16) in Q14
MUL32x16INTO32(pBiquadState->pDelays[3],pBiquadState->coefs[3],templ,16)
ynL+=templ;
// ynL+= ( (-B1 (Q14) * y(n-1)L (Q16) )>>16) in Q14
MUL32x16INTO32(pBiquadState->pDelays[2],pBiquadState->coefs[4],templ,16)
ynL+=templ;
/**************************************************************************
UPDATING THE DELAYS
***************************************************************************/
pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L
pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L
pBiquadState->pDelays[2]=ynL<<2; // Update y(n-1)L in Q16
pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0
/**************************************************************************
WRITING THE OUTPUT
***************************************************************************/
*pDataOut++=(LVM_INT16)(ynL>>14); // Write Left output in Q0
}
}
void BQ_2I_D16F32C15_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
LVM_INT16 *pDataIn,
LVM_INT16 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 ynL,ynR,templ;
LVM_INT16 ii;
PFilter_State pBiquadState = (PFilter_State) pInstance;
for (ii = NrSamples; ii != 0; ii--)
{
/**************************************************************************
PROCESSING OF THE LEFT CHANNEL
***************************************************************************/
/* ynL=A2 (Q15) * x(n-2)L (Q0) in Q15*/
ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2];
/* ynL+=A1 (Q15) * x(n-1)L (Q0) in Q15*/
ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0];
/* ynL+=A0 (Q15) * x(n)L (Q0) in Q15*/
ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn);
/* ynL+= ( (-B2 (Q15) * y(n-2)L (Q16) )>>16) in Q15 */
MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16)
ynL+=templ;
/* ynL+=( (-B1 (Q15) * y(n-1)L (Q16) )>>16) in Q15 */
MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16)
ynL+=templ;
/**************************************************************************
PROCESSING OF THE RIGHT CHANNEL
***************************************************************************/
/* ynR=A2 (Q15) * x(n-2)R (Q0) in Q15*/
ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3];
/* ynR+=A1 (Q15) * x(n-1)R (Q0) in Q15*/
ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1];
/* ynR+=A0 (Q15) * x(n)R (Q0) in Q15*/
ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1));
/* ynR+= ( (-B2 (Q15) * y(n-2)R (Q16) )>>16) in Q15 */
MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16)
ynR+=templ;
/* ynR+=( (-B1 (Q15) * y(n-1)R (Q16) )>>16) in Q15 */
MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16)
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]=ynR<<1; /* Update y(n-1)R in Q16*/
pBiquadState->pDelays[4]=ynL<<1; /* Update y(n-1)L in Q16*/
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_INT16)(ynL>>15); /* Write Left output in Q0*/
pDataOut++;
*pDataOut=(LVM_INT16)(ynR>>15); /* Write Right ouput in Q0*/
pDataOut++;
}
}
void FO_2I_D16F32C15_LShx_TRC_WRA_01(Biquad_Instance_t *pInstance,
LVM_INT16 *pDataIn,
LVM_INT16 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 ynL,ynR;
LVM_INT32 Temp;
LVM_INT32 NegSatValue;
LVM_INT16 ii;
LVM_INT16 Shift;
PFilter_State pBiquadState = (PFilter_State) pInstance;
NegSatValue = LVM_MAXINT_16 +1;
NegSatValue = -NegSatValue;
Shift = pBiquadState->Shift;
for (ii = NrSamples; ii != 0; ii--)
{
/**************************************************************************
PROCESSING OF THE LEFT CHANNEL
***************************************************************************/
// ynL =A1 (Q15) * x(n-1)L (Q15) in Q30
ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[0];
// ynR =A1 (Q15) * x(n-1)R (Q15) in Q30
ynR=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2];
// ynL+=A0 (Q15) * x(n)L (Q15) in Q30
ynL+=(LVM_INT32)pBiquadState->coefs[1]* (*pDataIn);
// ynR+=A0 (Q15) * x(n)L (Q15) in Q30
ynR+=(LVM_INT32)pBiquadState->coefs[1]* (*(pDataIn+1));
// ynL += (-B1 (Q15) * y(n-1)L (Q30) ) in Q30
MUL32x16INTO32(pBiquadState->pDelays[1],pBiquadState->coefs[2],Temp,15);
ynL +=Temp;
// ynR += (-B1 (Q15) * y(n-1)R (Q30) ) in Q30
MUL32x16INTO32(pBiquadState->pDelays[3],pBiquadState->coefs[2],Temp,15);
ynR +=Temp;
/**************************************************************************
UPDATING THE DELAYS
***************************************************************************/
pBiquadState->pDelays[1]=ynL; // Update y(n-1)L in Q30
pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q15
pBiquadState->pDelays[3]=ynR; // Update y(n-1)R in Q30
pBiquadState->pDelays[2]=(*pDataIn++); // Update x(n-1)R in Q15
/**************************************************************************
WRITING THE OUTPUT
***************************************************************************/
/*Apply shift: Instead of left shift on 16-bit result, right shift of (15-shift) is applied
for better SNR*/
ynL = ynL>>(15-Shift);
ynR = ynR>>(15-Shift);
/*Saturate results*/
if(ynL > LVM_MAXINT_16)
{
ynL = LVM_MAXINT_16;
}
else
{
if(ynL < NegSatValue)
{
ynL = NegSatValue;
}
}
if(ynR > LVM_MAXINT_16)
{
ynR = LVM_MAXINT_16;
}
else
{
if(ynR < NegSatValue)
{
ynR = NegSatValue;
}
}
*pDataOut++=(LVM_INT16)ynL;
*pDataOut++=(LVM_INT16)ynR;
}
}
