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 "BQ_1I_D16F16Css_TRC_WRA_01_Private.h" 202c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "LVM_Macros.h" 212c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 222c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent/************************************************************************** 232c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ASSUMPTIONS: 242c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent COEFS- 252c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 262c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 272c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[4] is -B1, these are in Q15 format 282c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 292c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent DELAYS- 302c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0] is x(n-1)L in Q0 format 312c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1] is x(n-2)L in Q0 format 322c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[2] is y(n-1)L in Q0 format 332c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[3] is y(n-2)L in Q0 format 342c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent***************************************************************************/ 352c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 362c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurentvoid BQ_1I_D16F16C15_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 372c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 *pDataIn, 382c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 *pDataOut, 392c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 NrSamples) 402c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 412c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 ynL; 422c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 ii; 432c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 442c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 452c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent for (ii = NrSamples; ii != 0; ii--) 462c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 472c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 482c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 492c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 502c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PROCESSING OF THE LEFT CHANNEL 512c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 522c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL=A2 (Q15) * x(n-2)L (Q0) in Q15 532c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[1]; 542c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 552c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+=A1 (Q15) * x(n-1)L (Q0) in Q15 562c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; 572c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 582c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+=A0 (Q15) * x(n)L (Q0) in Q15 592c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); 602c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 612c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+= (-B2 (Q15) * y(n-2)L (Q0) ) in Q15 622c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[3]; 632c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 642c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+= (-B1 (Q15) * y(n-1)L (Q0) ) in Q15 652c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[2]; 662c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 672c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL=ynL>>15; // ynL in Q0 format 682c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 692c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent UPDATING THE DELAYS 702c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 712c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 722c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 732c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0 742c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 752c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 762c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 772c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent WRITING THE OUTPUT 782c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 792c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent *pDataOut++=(LVM_INT16)ynL; // Write Left output in Q0 802c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 812c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 822c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 832c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 842c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 852c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 86