PK_2I_D32F32C14G11_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 "PK_2I_D32F32CssGss_TRC_WRA_01_Private.h"
29#include "LVM_Macros.h"
30
31/**************************************************************************
32 ASSUMPTIONS:
33 COEFS-
34 pBiquadState->coefs[0] is A0,
35 pBiquadState->coefs[1] is -B2,
36 pBiquadState->coefs[2] is -B1, these are in Q14 format
37 pBiquadState->coefs[3] is Gain, in Q11 format
38
39
40 DELAYS-
41 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
42 pBiquadState->pDelays[1] is x(n-1)R in Q0 format
43 pBiquadState->pDelays[2] is x(n-2)L in Q0 format
44 pBiquadState->pDelays[3] is x(n-2)R in Q0 format
45 pBiquadState->pDelays[4] is y(n-1)L in Q0 format
46 pBiquadState->pDelays[5] is y(n-1)R in Q0 format
47 pBiquadState->pDelays[6] is y(n-2)L in Q0 format
48 pBiquadState->pDelays[7] is y(n-2)R in Q0 format
49***************************************************************************/
50void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_Instance_t       *pInstance,
51                                     LVM_INT32               *pDataIn,
52                                     LVM_INT32               *pDataOut,
53                                     LVM_INT16               NrSamples)
54    {
55        LVM_INT32 ynL,ynR,ynLO,ynRO,templ;
56        LVM_INT16 ii;
57        PFilter_State pBiquadState = (PFilter_State) pInstance;
58
59         for (ii = NrSamples; ii != 0; ii--)
60         {
61
62
63            /**************************************************************************
64                            PROCESSING OF THE LEFT CHANNEL
65            ***************************************************************************/
66            /* ynL= (A0 (Q14) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>14)  in Q0*/
67            templ=(*pDataIn)-pBiquadState->pDelays[2];
68            MUL32x16INTO32(templ,pBiquadState->coefs[0],ynL,14)
69
70            /* ynL+= ((-B2 (Q14) * y(n-2)L (Q0) ) >>14) in Q0*/
71            MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,14)
72            ynL+=templ;
73
74            /* ynL+= ((-B1 (Q14) * y(n-1)L (Q0) ) >>14) in Q0 */
75            MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,14)
76            ynL+=templ;
77
78            /* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/
79            MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11)
80
81            /* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/
82            ynLO+= (*pDataIn);
83
84            /**************************************************************************
85                            PROCESSING OF THE RIGHT CHANNEL
86            ***************************************************************************/
87            /* ynR= (A0 (Q14) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>14)   in Q0*/
88            templ=(*(pDataIn+1))-pBiquadState->pDelays[3];
89            MUL32x16INTO32(templ,pBiquadState->coefs[0],ynR,14)
90
91            /* ynR+= ((-B2 (Q14) * y(n-2)R (Q0) ) >>14)  in Q0*/
92            MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,14)
93            ynR+=templ;
94
95            /* ynR+= ((-B1 (Q14) * y(n-1)R (Q0) ) >>14)  in Q0 */
96            MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,14)
97            ynR+=templ;
98
99            /* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/
100            MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11)
101
102            /* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/
103            ynRO+= (*(pDataIn+1));
104
105            /**************************************************************************
106                            UPDATING THE DELAYS
107            ***************************************************************************/
108            pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
109            pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
110            pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
111            pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
112            pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/
113            pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/
114            pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
115            pDataIn++;
116            pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
117            pDataIn++;
118
119            /**************************************************************************
120                            WRITING THE OUTPUT
121            ***************************************************************************/
122            *pDataOut=ynLO; /* Write Left output in Q0*/
123            pDataOut++;
124            *pDataOut=ynRO; /* Write Right ouput in Q0*/
125            pDataOut++;
126
127        }
128
129    }
130
131