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_D16F16Css_TRC_WRA_01_Private.h" 202c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent#include "LVM_Macros.h" 212c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 222c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 232c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent/************************************************************************** 242c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ASSUMPTIONS: 252c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent COEFS- 262c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 272c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 282c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[4] is -B1, these are in Q14 format 292c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 302c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent DELAYS- 312c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0] is x(n-1)L in Q0 format 322c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1] is x(n-1)R in Q0 format 332c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2] is x(n-2)L in Q0 format 342c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3] is x(n-2)R in Q0 format 352c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[4] is y(n-1)L in Q0 format 362c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[5] is y(n-1)R in Q0 format 372c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[6] is y(n-2)L in Q0 format 382c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[7] is y(n-2)R in Q0 format 392c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent***************************************************************************/ 402c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 412c87e9c923b0362fabf8c97ff63997542394c428Eric Laurentvoid BQ_2I_D16F16C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 422c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataIn, 432c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataOut, 442c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 NrSamples) 452c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 462c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 ynL,ynR; 472c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 ii; 482c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 492c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 502c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent for (ii = NrSamples; ii != 0; ii--) 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 (Q0) ) in Q14 662c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[6]; 672c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 682c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+=( -B1 (Q14) * y(n-1)L (Q0) ) in Q14 692c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[4]; 702c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 712c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL=ynL>>14; // ynL in Q0 format 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 (Q0) ) in Q14 862c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[7]; 872c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 882c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynR+=( -B1 (Q14) * y(n-1)R (Q0) ) in Q14 892c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[5]; 902c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 912c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynR=ynR>>14; // ynL in Q0 format 922c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 932c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent UPDATING THE DELAYS 942c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 952c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; // y(n-2)R=y(n-1)R 962c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; // y(n-2)L=y(n-1)L 972c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; // x(n-2)R=x(n-1)R 982c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 992c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[5]=ynR; // Update y(n-1)R in Q0 1002c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[4]=ynL; // Update y(n-1)L in Q0 1012c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 1022c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1]=(*pDataIn++); // Update x(n-1)R in Q0 1032c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1042c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 1052c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent WRITING THE OUTPUT 1062c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 1072c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut++=(LVM_INT16)ynL; // Write Left output in Q0 1082c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut++=(LVM_INT16)ynR; // Write Right ouput in Q0 1092c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1102c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1112c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 1122c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 1132c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 1142c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 115