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_1I_D16F16Css_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 Q15 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-2)L in Q0 format 322c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2] is y(n-1)L in Q0 format 332c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3] is y(n-2)L in Q0 format 342c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent***************************************************************************/ 352c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 362c87e9c923b0362fabf8c97ff63997542394c428Eric Laurentvoid BQ_1I_D16F16C15_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 372c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataIn, 382c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 *pDataOut, 392c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 NrSamples) 402c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 412c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 ynL; 422c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 ii; 432c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 442c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 452c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent for (ii = NrSamples; ii != 0; ii--) 462c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 472c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 482c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 492c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 502c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PROCESSING OF THE LEFT CHANNEL 512c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 522c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL=A2 (Q15) * x(n-2)L (Q0) in Q15 532c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[1]; 542c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 552c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+=A1 (Q15) * x(n-1)L (Q0) in Q15 562c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; 572c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 582c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+=A0 (Q15) * x(n)L (Q0) in Q15 592c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); 602c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 612c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+= (-B2 (Q15) * y(n-2)L (Q0) ) in Q15 622c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[3]; 632c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 642c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+= (-B1 (Q15) * y(n-1)L (Q0) ) in Q15 652c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[2]; 662c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 672c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL=ynL>>15; // ynL in Q0 format 682c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 692c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent UPDATING THE DELAYS 702c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 712c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 722c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 732c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0 742c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 752c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 762c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 772c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent WRITING THE OUTPUT 782c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 792c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut++=(LVM_INT16)ynL; // Write Left output in Q0 802c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 812c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 822c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 832c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 842c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 852c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 86