1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright (C) 2004-2010 NXP Software
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/************************************************************************/
/* */
/* Project:: */
/* $Author: beq07716 $*/
/* $Revision: 1000 $*/
/* $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $*/
/* */
/************************************************************************/
#include "BIQUAD.h"
#include "PK_2I_D32F32CllGss_TRC_WRA_01_Private.h"
#include "LVM_Macros.h"
/**************************************************************************
ASSUMPTIONS:
COEFS-
pBiquadState->coefs[0] is A0,
pBiquadState->coefs[1] is -B2,
pBiquadState->coefs[2] is -B1, these are in Q30 format
pBiquadState->coefs[3] is Gain, in Q11 format
DELAYS-
pBiquadState->pDelays[0] is x(n-1)L in Q0 format
pBiquadState->pDelays[1] is x(n-1)R in Q0 format
pBiquadState->pDelays[2] is x(n-2)L in Q0 format
pBiquadState->pDelays[3] is x(n-2)R in Q0 format
pBiquadState->pDelays[4] is y(n-1)L in Q0 format
pBiquadState->pDelays[5] is y(n-1)R in Q0 format
pBiquadState->pDelays[6] is y(n-2)L in Q0 format
pBiquadState->pDelays[7] is y(n-2)R in Q0 format
***************************************************************************/
void PK_2I_D32F32C30G11_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
LVM_INT32 *pDataIn,
LVM_INT32 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 ynL,ynR,ynLO,ynRO,templ;
LVM_INT16 ii;
PFilter_State pBiquadState = (PFilter_State) pInstance;
for (ii = NrSamples; ii != 0; ii--)
{
/**************************************************************************
PROCESSING OF THE LEFT CHANNEL
***************************************************************************/
/* ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0*/
templ=(*pDataIn)-pBiquadState->pDelays[2];
MUL32x32INTO32(templ,pBiquadState->coefs[0],ynL,30)
/* ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0*/
MUL32x32INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,30)
ynL+=templ;
/* ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0 */
MUL32x32INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,30)
ynL+=templ;
/* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/
MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11)
/* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/
ynLO+= (*pDataIn);
/**************************************************************************
PROCESSING OF THE RIGHT CHANNEL
***************************************************************************/
/* ynR= (A0 (Q30) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>30) in Q0*/
templ=(*(pDataIn+1))-pBiquadState->pDelays[3];
MUL32x32INTO32(templ,pBiquadState->coefs[0],ynR,30)
/* ynR+= ((-B2 (Q30) * y(n-2)R (Q0) ) >>30) in Q0*/
MUL32x32INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,30)
ynR+=templ;
/* ynR+= ((-B1 (Q30) * y(n-1)R (Q0) ) >>30) in Q0 */
MUL32x32INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,30)
ynR+=templ;
/* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/
MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11)
/* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/
ynRO+= (*(pDataIn+1));
/**************************************************************************
UPDATING THE DELAYS
***************************************************************************/
pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/
pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/
pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
pDataIn++;
pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
pDataIn++;
/**************************************************************************
WRITING THE OUTPUT
***************************************************************************/
*pDataOut=ynLO; /* Write Left output in Q0*/
pDataOut++;
*pDataOut=ynRO; /* Write Right ouput in Q0*/
pDataOut++;
}
}
|
