BQ_2I_D32F32C30_TRC_WRA_01.c revision 2c8e5cab3faa6d360e222b7a6c40a80083d021ac 
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/*                                                                      */
20/*     Project::                                                        */
21/*     $Author: beq07716 $*/
22/*     $Revision: 1000 $*/
23/*     $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $*/
24/*                                                                      */
25/************************************************************************/
26
27#include "BIQUAD.h"
28#include "BQ_2I_D32F32Cll_TRC_WRA_01_Private.h"
29#include "LVM_Macros.h"
30
31/**************************************************************************
32 ASSUMPTIONS:
33 COEFS-
34 pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1
35 pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2
36 pBiquadState->coefs[4] is -B1, these are in Q30 format
37
38 DELAYS-
39 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
40 pBiquadState->pDelays[1] is x(n-1)R in Q0 format
41 pBiquadState->pDelays[2] is x(n-2)L in Q0 format
42 pBiquadState->pDelays[3] is x(n-2)R in Q0 format
43 pBiquadState->pDelays[4] is y(n-1)L in Q0 format
44 pBiquadState->pDelays[5] is y(n-1)R in Q0 format
45 pBiquadState->pDelays[6] is y(n-2)L in Q0 format
46 pBiquadState->pDelays[7] is y(n-2)R in Q0 format
47***************************************************************************/
48
49void BQ_2I_D32F32C30_TRC_WRA_01 (           Biquad_Instance_t       *pInstance,
50                                            LVM_INT32                    *pDataIn,
51                                            LVM_INT32                    *pDataOut,
52                                            LVM_INT16                    NrSamples)
53
54
55    {
56        LVM_INT32 ynL,ynR,templ,tempd;
57        LVM_INT16 ii;
58        PFilter_State pBiquadState = (PFilter_State) pInstance;
59
60         for (ii = NrSamples; ii != 0; ii--)
61         {
62
63
64            /**************************************************************************
65                            PROCESSING OF THE LEFT CHANNEL
66            ***************************************************************************/
67            /* ynL= ( A2 (Q30) * x(n-2)L (Q0) ) >>30 in Q0*/
68            MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[2],ynL,30)
69
70            /* ynL+= ( A1 (Q30) * x(n-1)L (Q0) ) >> 30 in Q0*/
71            MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[0],templ,30)
72            ynL+=templ;
73
74            /* ynL+= ( A0 (Q30) * x(n)L (Q0) ) >> 30 in Q0*/
75            MUL32x32INTO32(pBiquadState->coefs[2],*pDataIn,templ,30)
76            ynL+=templ;
77
78             /* ynL+= (-B2 (Q30) * y(n-2)L (Q0) ) >> 30 in Q0*/
79            MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[6],templ,30)
80            ynL+=templ;
81
82            /* ynL+= (-B1 (Q30) * y(n-1)L (Q0) ) >> 30 in Q0 */
83            MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[4],templ,30)
84            ynL+=templ;
85
86            /**************************************************************************
87                            PROCESSING OF THE RIGHT CHANNEL
88            ***************************************************************************/
89            /* ynR= ( A2 (Q30) * x(n-2)R (Q0) ) >> 30 in Q0*/
90            MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[3],ynR,30)
91
92            /* ynR+= ( A1 (Q30) * x(n-1)R (Q0) ) >> 30  in Q0*/
93            MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[1],templ,30)
94            ynR+=templ;
95
96            /* ynR+= ( A0 (Q30) * x(n)R (Q0) ) >> 30 in Q0*/
97            tempd=*(pDataIn+1);
98            MUL32x32INTO32(pBiquadState->coefs[2],tempd,templ,30)
99            ynR+=templ;
100
101            /* ynR+= (-B2 (Q30) * y(n-2)R (Q0) ) >> 30 in Q0*/
102            MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[7],templ,30)
103            ynR+=templ;
104
105            /* ynR+= (-B1 (Q30) * y(n-1)R (Q0) ) >> 30 in Q0 */
106            MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[5],templ,30)
107            ynR+=templ;
108
109            /**************************************************************************
110                            UPDATING THE DELAYS
111            ***************************************************************************/
112            pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
113            pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
114            pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
115            pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
116            pBiquadState->pDelays[5]=(LVM_INT32)ynR; /* Update y(n-1)R in Q0*/
117            pBiquadState->pDelays[4]=(LVM_INT32)ynL; /* Update y(n-1)L in Q0*/
118            pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
119            pDataIn++;
120            pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
121            pDataIn++;
122
123            /**************************************************************************
124                            WRITING THE OUTPUT
125            ***************************************************************************/
126            *pDataOut=(LVM_INT32)ynL; /* Write Left output in Q0*/
127            pDataOut++;
128            *pDataOut=(LVM_INT32)ynR; /* Write Right ouput in Q0*/
129            pDataOut++;
130
131
132        }
133
134    }
135
136