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 "BP_1I_D32F32Cll_TRC_WRA_02_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 A0, 272c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[1] is -B2, 282c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->coefs[2] is -B1, these are in Q30 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-2)L in Q0 format 332c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2] is y(n-1)L in Q0 format 342c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3] is y(n-2)L in Q0 format 352c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent***************************************************************************/ 362c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 372c87e9c923b0362fabf8c97ff63997542394c428Eric Laurentvoid BP_1I_D32F32C30_TRC_WRA_02 ( Biquad_Instance_t *pInstance, 382c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 *pDataIn, 392c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 *pDataOut, 402c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 NrSamples) 412c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 422c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT32 ynL,templ; 432c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent LVM_INT16 ii; 442c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 452c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 462c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent for (ii = NrSamples; ii != 0; ii--) 472c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent { 482c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 492c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 502c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 512c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent PROCESSING OF THE LEFT CHANNEL 522c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 532c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0 542c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent templ=(*pDataIn)-pBiquadState->pDelays[1]; 552c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x32INTO32(pBiquadState->coefs[0],templ,ynL,30) 562c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 572c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0 582c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[3],templ,30) 592c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=templ; 602c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 612c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent // ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0 622c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[2],templ,30) 632c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ynL+=templ; 642c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 652c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 662c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent UPDATING THE DELAYS 672c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 682c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 692c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 702c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0 712c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 722c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 732c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent /************************************************************************** 742c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent WRITING THE OUTPUT 752c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent ***************************************************************************/ 762c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent *pDataOut++=ynL; // Write Left output in Q0 772c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 782c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 792c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 802c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent } 812c87e9c923b0362fabf8c97ff63997542394c428Eric Laurent 82