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comparison src/cs/layer1/gtt_include/ctm/tonemod.h @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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1 /*
2 *******************************************************************************
3 *
4 * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
5 * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
6 *
7 * The program(s) may be used and/or copied only with the
8 * written permission from Ericsson or in accordance
9 * with the terms and conditions stipulated in the agreement or
10 * contract under which the program(s) have been supplied.
11 *
12 * Changes since October 13, 2000:
13 * - The type mod_state_t includes a new member txbits_fifo_state now.
14 *
15 *******************************************************************************
16 *
17 * File : tonemod.h
18 * Purpose : header file for tonemod.c
19 *
20 *******************************************************************************
21 */
22
23 #ifndef tonemod_h
24 #define tonemod_h "$Id: $"
25
26 /*
27 *******************************************************************************
28 * INCLUDE FILES
29 *******************************************************************************
30 */
31
32 #include <fifo.h>
33
34 /*
35 *******************************************************************************
36 * DECLARATION OF PROTOTYPES
37 *******************************************************************************
38 */
39
40
41 /* Define a type for the state variable of the function tonemod() */
42
43 typedef struct {
44 WORD16 cntModulatedSamples;
45 WORD16 actualBits[2];
46 fifo_state_t txbits_fifo_state;
47 } mod_state_t;
48
49
50 /* ---------------------------------------------------------------------- */
51 /* Function init_tonemod() */
52 /* *********************** */
53 /* This function has to be executed before tonemod() can be used. */
54 /* ---------------------------------------------------------------------- */
55
56 void init_tonemod(mod_state_t *mod_state);
57
58
59 /* ---------------------------------------------------------------------- */
60 /* Function tonemod() */
61 /* ****************** */
62 /* Modulator of the Cellular Text Telephone Modem. */
63 /* The input vector bits_in must contain the bits that have to be */
64 /* transmitted. The length of bits_in must be even because always two */
65 /* bits are coded in parallel. */
66 /* Bits are either unipolar (i.e. {0, 1}) or bipolar (i.e. {-1, +1)}. */
67 /* The length of the output vector tones_out must be 20 times longer than */
68 /* the length of bits_in, since each pair of two bits is coded within a */
69 /* frame of 40 audio samples. */
70 /* ---------------------------------------------------------------------- */
71
72 void tonemod(WORD16 *tones_out,
73 WORD16 *bits_in,
74 WORD16 num_samples_tones_out,
75 WORD16 num_bits_in,
76 mod_state_t *mod_state);
77
78 #endif