12c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent/* 22c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * Copyright (C) 2004-2010 NXP Software 32c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * Copyright (C) 2010 The Android Open Source Project 42c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * 52c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * Licensed under the Apache License, Version 2.0 (the "License"); 62c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * you may not use this file except in compliance with the License. 72c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * You may obtain a copy of the License at 82c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * 92c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * http://www.apache.org/licenses/LICENSE-2.0 102c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * 112c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * Unless required by applicable law or agreed to in writing, software 122c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * distributed under the License is distributed on an "AS IS" BASIS, 132c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 142c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * See the License for the specific language governing permissions and 152c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent * limitations under the License. 162c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent */ 172c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 182c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent#include "BIQUAD.h" 192c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent#include "BQ_2I_D16F32Css_TRC_WRA_01_Private.h" 202c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent#include "LVM_Macros.h" 212c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 222c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent/************************************************************************** 232c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ASSUMPTIONS: 242c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent COEFS- 252c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 262c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 272c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[4] is -B1, these are in Q14 format 282c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 292c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent DELAYS- 302c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0] is x(n-1)L in Q0 format 312c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1] is x(n-1)R in Q0 format 322c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2] is x(n-2)L in Q0 format 332c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3] is x(n-2)R in Q0 format 342c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[4] is y(n-1)L in Q16 format 352c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[5] is y(n-1)R in Q16 format 362c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[6] is y(n-2)L in Q16 format 372c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[7] is y(n-2)R in Q16 format 382c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent***************************************************************************/ 392c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 402c87e9c923b0362fabf8c97ff63997542394c428Eric Laurentvoid BQ_2I_D16F32C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 412c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataIn, 422c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataOut, 432c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 NrSamples) 442c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 452c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 ynL,ynR,templ; 462c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 ii; 472c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 482c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 492c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent for (ii = NrSamples; ii != 0; ii--) 502c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 512c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 522c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 532c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 542c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PROCESSING OF THE LEFT CHANNEL 552c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 562c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynL=A2 (Q14) * x(n-2)L (Q0) in Q14*/ 572c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2]; 582c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 592c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynL+=A1 (Q14) * x(n-1)L (Q0) in Q14*/ 602c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; 612c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 622c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynL+=A0 (Q14) * x(n)L (Q0) in Q14*/ 632c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); 642c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 652c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynL+= ( (-B2 (Q14) * y(n-2)L (Q16) )>>16) in Q14 */ 662c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16) 672c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=templ; 682c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 692c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynL+=( (-B1 (Q14) * y(n-1)L (Q16) )>>16) in Q14 */ 702c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16) 712c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=templ; 722c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 732c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 742c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PROCESSING OF THE RIGHT CHANNEL 752c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 762c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynR=A2 (Q14) * x(n-2)R (Q0) in Q14*/ 772c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3]; 782c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 792c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynR+=A1 (Q14) * x(n-1)R (Q0) in Q14*/ 802c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1]; 812c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 822c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynR+=A0 (Q14) * x(n)R (Q0) in Q14*/ 832c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1)); 842c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 852c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynR+= ( (-B2 (Q14) * y(n-2)R (Q16) )>>16) in Q14*/ 862c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16) 872c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=templ; 882c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 892c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /* ynR+=( (-B1 (Q14) * y(n-1)R (Q16) )>>16) in Q14 */ 902c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16) 912c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=templ; 922c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 932c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 942c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent UPDATING THE DELAYS 952c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 962c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 972c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 982c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 992c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 1002c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[5]=ynR<<2; /* Update y(n-1)R in Q16*/ 1012c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[4]=ynL<<2; /* Update y(n-1)L in Q16*/ 1022c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 1032c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pDataIn++; 1042c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 1052c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pDataIn++; 1062c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1072c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 1082c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent WRITING THE OUTPUT 1092c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 1102c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut=(LVM_INT16)(ynL>>14); /* Write Left output in Q0*/ 1112c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pDataOut++; 1122c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut=(LVM_INT16)(ynR>>14); /* Write Right ouput in Q0*/ 1132c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pDataOut++; 1142c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 1152c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1162c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 1172c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 118