FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/int_lpc.c @ 381:32bc48faec4b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libtwamr: integrate int_lpc.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 05:35:21 +0000
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
381
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * R99 Version 3.3.0
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 * REL-4 Version 4.1.0
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 * File : int_lpc.c
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 * MODULE INCLUDE FILE AND VERSION ID
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 #include "namespace.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 #include "int_lpc.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 * INCLUDE FILES
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 #include "typedef.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 #include "basic_op.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 #include "no_count.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 #include "cnst.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 #include "lsp_az.h"
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 * LOCAL VARIABLES AND TABLES
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 *--------------------------------------*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 * Constants (defined in cnst.h) *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 *--------------------------------------*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 * M : LPC order *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 * MP1 : LPC order + 1 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 *--------------------------------------*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 * PUBLIC PROGRAM CODE
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 ********************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 **************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 * Function : Int_lpc_1and3
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 * Purpose : Interpolates the LSPs and converts to LPC parameters
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 * to get a different LP filter in each subframe.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 * Description : The 20 ms speech frame is divided into 4 subframes.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 * The LSPs are quantized and transmitted at the 2nd and
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 * 4th subframes (twice per frame) and interpolated at the
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 * 1st and 3rd subframe.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 * |------|------|------|------|
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 * sf1 sf2 sf3 sf4
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 * F0 Fm F1
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 * sf2: Fm sf4: F1
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 * Returns : void
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 **************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 void Int_lpc_1and3 (
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 present frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 present frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 Word16 Az[] /* o : interpolated LP parameters in all subfr.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 (AZ_SIZE) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 )
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 Word16 i;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 Word16 lsp[M];
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 for (i = 0; i < M; i++)
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_old[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 Lsp_Az (lsp, Az); /* Subframe 1 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 Lsp_Az (lsp_mid, Az); /* Subframe 2 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 for (i = 0; i < M; i++)
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_new[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 Lsp_Az (lsp, Az); /* Subframe 3 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 Lsp_Az (lsp_new, Az); /* Subframe 4 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 return;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 /*
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 **************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 * Function : Int_lpc_1and3_2
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 * function but we do not recompute Az() for subframe 2 and
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 * 4 because it is already available.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 * Returns : void
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 **************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 void Int_lpc_1and3_2 (
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 present frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 Word16 lsp_new[], /* i : LSP vector at the 4th subframe of
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 present frame (M) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 Word16 Az[] /* o :interpolated LP parameters
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 in subframes 1 and 3 (AZ_SIZE) */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 )
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 Word16 i;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 Word16 lsp[M];
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 for (i = 0; i < M; i++)
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_old[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 Lsp_Az (lsp, Az); /* Subframe 1 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 Az += MP1 * 2; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 for (i = 0; i < M; i++)
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_new[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 Lsp_Az (lsp, Az); /* Subframe 3 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 return;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 /*************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 * FUNCTION: Int_lpc_1to3()
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 * PURPOSE: Interpolates the LSPs and convert to LP parameters to get
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 * a different LP filter in each subframe.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 * DESCRIPTION:
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 * The 20 ms speech frame is divided into 4 subframes.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 * The LSPs are quantized and transmitted at the 4th subframe
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 * (once per frame) and interpolated at the 1st, 2nd and 3rd subframe.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 * |------|------|------|------|
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 * sf1 sf2 sf3 sf4
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 * F0 F1
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 * sf2: 1/2 F0 + 1/2 F1 sf4: F1
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 *
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 *************************************************************************/
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 void Int_lpc_1to3(
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 Word16 Az[] /* output: interpolated LP parameters in all SFs */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 )
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 Word16 i;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 Word16 lsp[M];
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 lsp[i] = add(shr(lsp_new[i], 2), sub(lsp_old[i], shr(lsp_old[i], 2)));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 Lsp_Az(lsp, Az); /* Subframe 1 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 lsp[i] = add(shr(lsp_old[i], 1), shr(lsp_new[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 Lsp_Az(lsp, Az); /* Subframe 2 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 lsp[i] = add(shr(lsp_old[i], 2), sub(lsp_new[i], shr(lsp_new[i], 2)));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 Lsp_Az(lsp, Az); /* Subframe 3 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 Lsp_Az(lsp_new, Az); /* Subframe 4 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 return;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 /*************************************************************************
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 * Function Int_lpc_1to3_2()
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 * Interpolation of the LPC parameters.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 * Same as the previous function but we do not recompute Az() for
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 * subframe 4 because it is already available.
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 *************************************************************************/
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 void Int_lpc_1to3_2(
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 Word16 Az[] /* output: interpolated LP parameters in SFs 1,2,3 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 )
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 Word16 i;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 Word16 lsp[M];
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 lsp[i] = add(shr(lsp_new[i], 2), sub(lsp_old[i], shr(lsp_old[i], 2)));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 Lsp_Az(lsp, Az); /* Subframe 1 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 lsp[i] = add(shr(lsp_old[i], 1), shr(lsp_new[i], 1));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 Lsp_Az(lsp, Az); /* Subframe 2 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 Az += MP1; move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 for (i = 0; i < M; i++) {
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 lsp[i] = add(shr(lsp_old[i], 2), sub(lsp_new[i], shr(lsp_new[i], 2)));
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 move16 ();
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 }
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 Lsp_Az(lsp, Az); /* Subframe 3 */
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 return;
32bc48faec4b libtwamr: integrate int_lpc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
256 }