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annotate src/cs/layer1/gtt_include/ctm/tonedemod.h @ 11:b493d3857f4e

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helpers: initial import from Magnetite (pruned)
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 15 Jul 2018 21:24:44 +0000
parents b6a5e36de839
children
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1 /*
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2 *******************************************************************************
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3 *
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4 * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
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5 * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
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6 *
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7 * The program(s) may be used and/or copied only with the
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8 * written permission from Ericsson or in accordance
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9 * with the terms and conditions stipulated in the agreement or
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10 * contract under which the program(s) have been supplied.
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11 *
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12 *******************************************************************************
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13 *
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14 * File : tonedemod.h
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15 * Purpose : Demodulator for the Cellular Text Telephone Modem
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16 * 1-out-of-4 tones (400, 600, 800, 1000 Hz)
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17 * for the coding of each pair of two adjacent bits
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18 *
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19 * Definition of the type demod_state_t and of the
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20 * functions init_tonedemod() and tonedemod()
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21 *
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22 *******************************************************************************
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23 */
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24
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25 #ifndef tonedemod_h
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26 #define tonedemod_h "$Id: $"
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27
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28 /*
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29 *******************************************************************************
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30 * INCLUDE FILES
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31 *******************************************************************************
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32 */
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33
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34 #include "ctm_defines.h"
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35
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36 /*
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37 *******************************************************************************
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38 * DECLARATION OF PROTOTYPES
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39 *******************************************************************************
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40 */
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41
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42 typedef struct {
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43 WORD16 buffer_tone_rx[3*SYMB_LEN];
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44 WORD16 xcorr_t0[2*SYMB_LEN];
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45 WORD16 xcorr_t1[2*SYMB_LEN];
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46 WORD16 xcorr_t2[2*SYMB_LEN];
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47 WORD16 xcorr_t3[2*SYMB_LEN];
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48 WORD16 xcorr_wb[2*SYMB_LEN];
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49 WORD16 lowpass[SYMB_LEN];
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50 WORD16 waveform_t0[SYMB_LEN];
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51 WORD16 waveform_t1[SYMB_LEN];
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52 WORD16 waveform_t2[SYMB_LEN];
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53 WORD16 waveform_t3[SYMB_LEN];
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54 WORD16 diff_smooth[SYMB_LEN];
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55 } demod_state_t;
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56
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57
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58 /* ----------------------------------------------------------------------- */
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59 /* FUNCTION tonedemod() */
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60 /* ******************** */
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61 /* Tone Demodulator for the Cellular Text Telephone Modem */
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62 /* using one out of four tones for coding two bits in parallel within a */
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63 /* frame of 40 samples (5 ms). */
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64 /* */
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65 /* The function has to be called for every frame of 40 samples of the */
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66 /* received tone sequence. However, in order to track a non-ideal */
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67 /* of the transmitter's and the receiver's clock frequencies, one frame */
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68 /* might be shorter (only 39 samples) or longer (41 samples). The */
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69 /* of the following frame is indicated by the variable */
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70 /* *sampling_correction, which is calculated and returned by this function.*/
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71 /* */
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72 /* input variables: */
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73 /* bits_out contains the 39, 40 or 41 actual samples of the */
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74 /* received tones; the bits are soft bits, i.e. they */
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75 /* are in the range between -1.0 and 1.0, where the */
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76 /* magnitude serves as reliability information */
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77 /* num_in_samples number of valid samples in bits_out */
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78 /* */
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79 /* output variables: */
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80 /* bits_out contains the two actual decoded soft bits */
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81 /* sampling_correction is either -1, 0, or 1 and indicates whether the */
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82 /* next frame shall contain 39, 40, or 41 samples */
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83 /* demod_state contains all the memory of tonedemod. Must be */
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84 /* initialized using the function init_tonedemod() */
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85 /* ----------------------------------------------------------------------- */
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86
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87 void tonedemod(WORD16 *bits_out,
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88 WORD16 *rx_tone_vec,
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89 WORD16 num_in_samples,
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90 WORD16 *ptr_sampling_correction,
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91 demod_state_t *demod_state);
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92
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93
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94 /* ----------------------------------------------------------------------- */
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95 /* FUNCTION init_tonedemod() */
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96 /* ************************* */
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97 /* Initialization of one instance of the Tone Demodulator. The argument */
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98 /* must contain a pointer to a variable of type demod_state_t, which */
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99 /* contains all the memory of the tone demodulator. Each instance of */
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100 /* tonedemod must have its own variable. */
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101 /* ----------------------------------------------------------------------- */
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102
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103 void init_tonedemod(demod_state_t *demod_state);
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104
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105 #endif
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106