annotate libtwamr/syn_filt.c @ 394:2af94ba0c075

libtwamr: integrate syn_filt.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 18:49:17 +0000
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
394
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * R99 Version 3.3.0
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 * REL-4 Version 4.1.0
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 * File : syn_filt.c
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 * Purpose : Perform synthesis filtering through 1/A(z).
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 * MODULE INCLUDE FILE AND VERSION ID
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 #include "namespace.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 #include "syn_filt.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 * INCLUDE FILES
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 #include "typedef.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 #include "basic_op.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 #include "no_count.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 #include "cnst.h"
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 * LOCAL VARIABLES AND TABLES
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 *--------------------------------------*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 * Constants (defined in cnst.h *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 *--------------------------------------*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 * M : LPC order *
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 *--------------------------------------*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 /*
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 * PUBLIC PROGRAM CODE
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 ********************************************************************************
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 void Syn_filt (
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 Word16 a[], /* (i) : a[M+1] prediction coefficients (M=10) */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 Word16 x[], /* (i) : input signal */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 Word16 y[], /* (o) : output signal */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 Word16 lg, /* (i) : size of filtering */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 Word16 mem[], /* (i/o) : memory associated with this filtering. */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 Word16 update /* (i) : 0=no update, 1=update of memory. */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 )
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 Word16 i, j;
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 Word32 s;
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 Word16 tmp[80]; /* This is usually done by memory allocation (lg+M) */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 Word16 *yy;
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 /* Copy mem[] to yy[] */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 yy = tmp; move16 ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 for (i = 0; i < M; i++)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 *yy++ = mem[i]; move16 ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 /* Do the filtering. */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 for (i = 0; i < lg; i++)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 s = L_mult (x[i], a[0]);
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 for (j = 1; j <= M; j++)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 s = L_msu (s, a[j], yy[-j]);
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 s = L_shl (s, 3);
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 *yy++ = round (s); move16 ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 for (i = 0; i < lg; i++)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 y[i] = tmp[i + M]; move16 ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 /* Update of memory if update==1 */
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 test ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 if (update != 0)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 for (i = 0; i < M; i++)
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 {
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 mem[i] = y[lg - M + i]; move16 ();
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 }
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 return;
2af94ba0c075 libtwamr: integrate syn_filt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 }