12c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent/* 22c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Copyright (C) 2004-2010 NXP Software 32c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Copyright (C) 2010 The Android Open Source Project 42c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 52c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Licensed under the Apache License, Version 2.0 (the "License"); 62c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * you may not use this file except in compliance with the License. 72c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * You may obtain a copy of the License at 82c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 92c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * http://www.apache.org/licenses/LICENSE-2.0 102c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 112c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Unless required by applicable law or agreed to in writing, software 122c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * distributed under the License is distributed on an "AS IS" BASIS, 132c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 142c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * See the License for the specific language governing permissions and 152c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * limitations under the License. 162c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent */ 172c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 182c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "BIQUAD.h" 192c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "BP_1I_D32F32Cll_TRC_WRA_02_Private.h" 202c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "LVM_Macros.h" 212c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 222c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 232c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent/************************************************************************** 242c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ASSUMPTIONS: 252c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent COEFS- 262c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[0] is A0, 272c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[1] is -B2, 282c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[2] is -B1, these are in Q30 format 292c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 302c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent DELAYS- 312c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0] is x(n-1)L in Q0 format 322c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1] is x(n-2)L in Q0 format 332c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[2] is y(n-1)L in Q0 format 342c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[3] is y(n-2)L in Q0 format 352c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent***************************************************************************/ 362c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 372c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurentvoid BP_1I_D32F32C30_TRC_WRA_02 ( Biquad_Instance_t *pInstance, 382c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 *pDataIn, 392c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 *pDataOut, 402c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 NrSamples) 412c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 422c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 ynL,templ; 432c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 ii; 442c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 452c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 462c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent for (ii = NrSamples; ii != 0; ii--) 472c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 482c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 492c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 502c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 512c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PROCESSING OF THE LEFT CHANNEL 522c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 532c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0 542c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent templ=(*pDataIn)-pBiquadState->pDelays[1]; 552c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[0],templ,ynL,30) 562c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 572c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0 582c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[3],templ,30) 592c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=templ; 602c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 612c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0 622c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[2],templ,30) 632c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=templ; 642c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 652c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 662c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent UPDATING THE DELAYS 672c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 682c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 692c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 702c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0 712c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 722c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 732c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 742c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent WRITING THE OUTPUT 752c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 762c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent *pDataOut++=ynL; // Write Left output in Q0 772c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 782c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 792c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 802c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 812c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 82