FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/pstfilt.c @ 478:936a08cc73ce

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 59655481e45b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
401
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * R99 Version 3.3.0
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * REL-4 Version 4.1.0
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 * File : pstfilt.c
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 * Purpose : Performs adaptive postfiltering on the synthesis
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 * : speech
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 /*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 * MODULE INCLUDE FILE AND VERSION ID
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 #include "namespace.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 #include "pstfilt.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 /*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 * INCLUDE FILES
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 #include "tw_amr.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 #include "typedef.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 #include "basic_op.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 #include "memops.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 #include "weight_a.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 #include "residu.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 #include "syn_filt.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 #include "preemph.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 #include "no_count.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 #include "cnst.h"
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 /*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 * LOCAL VARIABLES AND TABLES
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 /*---------------------------------------------------------------*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 * Postfilter constant parameters (defined in "cnst.h") *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 *---------------------------------------------------------------*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 * L_FRAME : Frame size. *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 * L_SUBFR : Sub-frame size. *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 * M : LPC order. *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 * MP1 : LPC order+1 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 * MU : Factor for tilt compensation filter *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 * AGC_FAC : Factor for automatic gain control *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 *---------------------------------------------------------------*/
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 #define L_H 22 /* size of truncated impulse response of A(z/g1)/A(z/g2) */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 /* Spectral expansion factors */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 static const Word16 gamma3_MR122[M] = {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 22938, 16057, 11240, 7868, 5508,
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 3856, 2699, 1889, 1322, 925
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 };
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 static const Word16 gamma3[M] = {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 18022, 9912, 5451, 2998, 1649, 907, 499, 274, 151, 83
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 };
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 static const Word16 gamma4_MR122[M] = {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 24576, 18432, 13824, 10368, 7776,
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 5832, 4374, 3281, 2461, 1846
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 };
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 static const Word16 gamma4[M] = {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 22938, 16057, 11240, 7868, 5508, 3856, 2699, 1889, 1322, 925
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 };
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 /*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 * PUBLIC PROGRAM CODE
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 ********************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 /*************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 * Function: Post_Filter_reset
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 * Purpose: Initializes state memory to zero
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 **************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 void Post_Filter_reset (Post_FilterState *state)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 Set_zero (state->mem_syn_pst, M);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93 Set_zero (state->res2, L_SUBFR);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 Set_zero (state->synth_buf, L_FRAME + M);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 agc_reset(&state->agc_state);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 preemphasis_reset(&state->preemph_state);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 /*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 **************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 * Function: Post_Filter
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 * Purpose: postfiltering of synthesis speech.
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 * Description:
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 * The postfiltering process is described as follows:
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 * - inverse filtering of syn[] through A(z/0.7) to get res2[]
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 * - tilt compensation filtering; 1 - MU*k*z^-1
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 * - synthesis filtering through 1/A(z/0.75)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 * - adaptive gain control
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 **************************************************************************
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 int Post_Filter (
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 Post_FilterState *st, /* i/o : post filter states */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 enum Mode mode, /* i : AMR mode */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 )
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 /*-------------------------------------------------------------------*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 * Declaration of parameters *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 *-------------------------------------------------------------------*/
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 Word16 Ap3[MP1], Ap4[MP1]; /* bandwidth expanded LP parameters */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 Word16 *Az; /* pointer to Az_4: */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 /* LPC parameters in each subframe */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 Word16 i_subfr; /* index for beginning of subframe */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 Word16 h[L_H];
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 Word16 i;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 Word16 temp1, temp2;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 Word32 L_tmp;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 Word16 *syn_work = &st->synth_buf[M]; move16 ();
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 /*-----------------------------------------------------*
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 * Post filtering *
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 *-----------------------------------------------------*/
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 Copy (syn, syn_work , L_FRAME);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 Az = Az_4;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 /* Find weighted filter coefficients Ap3[] and ap[4] */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 test (); test ();
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 if (sub(mode, MR122) == 0 || sub(mode, MR102) == 0)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 Weight_Ai (Az, gamma3_MR122, Ap3);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 Weight_Ai (Az, gamma4_MR122, Ap4);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 else
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 Weight_Ai (Az, gamma3, Ap3);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 Weight_Ai (Az, gamma4, Ap4);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 /* filtering of synthesis speech by A(z/0.7) to find res2[] */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 Residu (Ap3, &syn_work[i_subfr], st->res2, L_SUBFR);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 /* tilt compensation filter */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 /* impulse response of A(z/0.7)/A(z/0.75) */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 Copy (Ap3, h, M + 1);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 Set_zero (&h[M + 1], L_H - M - 1);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 Syn_filt (Ap4, h, h, L_H, &h[M + 1], 0);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 /* 1st correlation of h[] */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 L_tmp = L_mult (h[0], h[0]);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 for (i = 1; i < L_H; i++)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 L_tmp = L_mac (L_tmp, h[i], h[i]);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 temp1 = extract_h (L_tmp);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 L_tmp = L_mult (h[0], h[1]);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 for (i = 1; i < L_H - 1; i++)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 L_tmp = L_mac (L_tmp, h[i], h[i + 1]);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 temp2 = extract_h (L_tmp);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 test ();
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 if (temp2 <= 0)
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 temp2 = 0; move16 ();
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 else
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 temp2 = mult (temp2, MU);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 temp2 = div_s (temp2, temp1);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 preemphasis (&st->preemph_state, st->res2, temp2, L_SUBFR);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 /* filtering through 1/A(z/0.75) */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 Syn_filt (Ap4, st->res2, &syn[i_subfr], L_SUBFR, st->mem_syn_pst, 1);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 /* scale output to input */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 agc (&st->agc_state, &syn_work[i_subfr], &syn[i_subfr],
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 AGC_FAC, L_SUBFR);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 Az += MP1;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 /* update syn_work[] buffer */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 Copy (&syn_work[L_FRAME - M], &syn_work[-M], M);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 return 0;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 }