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 #include "BIQUAD.h"
19 #include "BP_1I_D32F32Cll_TRC_WRA_02_Private.h"
20 #include "LVM_Macros.h"
21
22
23 /**************************************************************************
24 ASSUMPTIONS:
25 COEFS-
26 pBiquadState->coefs[0] is A0,
27 pBiquadState->coefs[1] is -B2,
28 pBiquadState->coefs[2] is -B1, these are in Q30 format
29
30 DELAYS-
31 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
32 pBiquadState->pDelays[1] is x(n-2)L in Q0 format
33 pBiquadState->pDelays[2] is y(n-1)L in Q0 format
34 pBiquadState->pDelays[3] is y(n-2)L in Q0 format
35 ***************************************************************************/
36
BP_1I_D32F32C30_TRC_WRA_02(Biquad_Instance_t * pInstance,LVM_INT32 * pDataIn,LVM_INT32 * pDataOut,LVM_INT16 NrSamples)37 void BP_1I_D32F32C30_TRC_WRA_02 ( Biquad_Instance_t *pInstance,
38 LVM_INT32 *pDataIn,
39 LVM_INT32 *pDataOut,
40 LVM_INT16 NrSamples)
41 {
42 LVM_INT32 ynL,templ;
43 LVM_INT16 ii;
44 PFilter_State pBiquadState = (PFilter_State) pInstance;
45
46 for (ii = NrSamples; ii != 0; ii--)
47 {
48
49
50 /**************************************************************************
51 PROCESSING OF THE LEFT CHANNEL
52 ***************************************************************************/
53 // ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0
54 templ=(*pDataIn)-pBiquadState->pDelays[1];
55 MUL32x32INTO32(pBiquadState->coefs[0],templ,ynL,30)
56
57 // ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0
58 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[3],templ,30)
59 ynL+=templ;
60
61 // ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0
62 MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[2],templ,30)
63 ynL+=templ;
64
65 /**************************************************************************
66 UPDATING THE DELAYS
67 ***************************************************************************/
68 pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L
69 pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L
70 pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0
71 pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0
72
73 /**************************************************************************
74 WRITING THE OUTPUT
75 ***************************************************************************/
76 *pDataOut++=ynL; // Write Left output in Q0
77
78 }
79
80 }
81
82