| /* |
| * 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++; |
| |
| |
| } |
| |
| } |
| |