FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/levinson.h @ 488:6724fbb01a09 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
PACKAGING: grammar fix
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 22:02:36 +0000
parents c713061b6edf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
385
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 *
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * R99 Version 3.3.0
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 * REL-4 Version 4.1.0
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 *
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 *
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 * File : levinson.h
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 * Purpose : Levinson-Durbin algorithm in double precision.
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 * : To compute the LP filter parameters from the
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 * : speech autocorrelations.
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 *
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 #ifndef levinson_h
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 #define levinson_h "$Id $"
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 /*
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 * INCLUDE FILES
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 #include "typedef.h"
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 #include "cnst.h"
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 /*
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 * LOCAL VARIABLES AND TABLES
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 /*
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 * DEFINITION OF DATA TYPES
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 typedef struct {
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 Word16 old_A[M + 1]; /* Last A(z) for case of unstable filter */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 } LevinsonState;
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 /*
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 * DECLARATION OF PROTOTYPES
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 ********************************************************************************
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 void Levinson_reset (LevinsonState *st);
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 /* reset of pre processing state (i.e. set state memory to zero)
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 returns 0 on success
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 int Levinson (
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 LevinsonState *st,
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 Word16 Rh[], /* i : Rh[m+1] Vector of autocorrelations (msb) */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 Word16 Rl[], /* i : Rl[m+1] Vector of autocorrelations (lsb) */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 Word16 A[], /* o : A[m] LPC coefficients (m = 10) */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 Word16 rc[] /* o : rc[4] First 4 reflection coefficients */
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 );
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61
c713061b6edf libtwamr: integrate levinson.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 #endif