1/*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18/*-------------------------------------------------------------------------*/
19#include "BIQUAD.h"
20#include "BP_1I_D16F32Cll_TRC_WRA_01_Private.h"
21
22
23/*-------------------------------------------------------------------------*/
24/* FUNCTION:                                                               */
25/*   BP_1I_D16F32Cll_TRC_WRA_01_Init                                       */
26/*                                                                         */
27/* DESCRIPTION:                                                            */
28/*   These functions initializes a Band pass filter (BIQUAD)               */
29/*   biquadratic Filter Sections.                                          */
30/*                                                                         */
31/* PARAMETERS:                                                             */
32/*   pInstance    - output, returns the pointer to the State Variable      */
33/*                   This state pointer must be passed to any subsequent   */
34/*                   call to "Biquad" functions.                           */
35/*   pTaps         - input, pointer to the taps memory                     */
36/*   pCoef         - input, pointer to the coefficient structure           */
37/*   N             - M coefficient factor of QM.N                          */
38/*                                                                         */
39/*        The coefficients are modified in the init() function such that lower               */
40/*        half word is right shifted by one and most significant bit of the lower            */
41/*        word is made to be zero.                                                           */
42/*                                                                                           */
43/*       Reason: For MIPS effciency,we are using DSP 32*16 multiplication                    */
44/*       instruction. But we have 32*32 multiplication. This can be realized by two 32*16    */
45/*       multiplication. But 16th bit in the 32 bit word is not a sign bit. So this is done  */
46/*       by putting 16th bit to zero and lossing one bit precision by division of lower      */
47/*       half word by 2.                                                                     */
48/* RETURNS:                                                                */
49/*   void return code                                                      */
50/*-------------------------------------------------------------------------*/
51void BP_1I_D16F32Cll_TRC_WRA_01_Init (   Biquad_Instance_t         *pInstance,
52                                         Biquad_1I_Order2_Taps_t   *pTaps,
53                                         BP_C32_Coefs_t            *pCoef)
54{
55  PFilter_State pBiquadState = (PFilter_State) pInstance;
56  pBiquadState->pDelays       =(LVM_INT32 *) pTaps;
57
58  pBiquadState->coefs[0] =  pCoef->A0;
59  pBiquadState->coefs[1] =  pCoef->B2;
60  pBiquadState->coefs[2] =  pCoef->B1;
61}
62/*-------------------------------------------------------------------------*/
63/* End Of File: BP_1I_D16F32Cll_TRC_WRA_01_Init.c                              */
64
65