FreeCalypso > hg > fc-magnetite

annotate src/cs/layer1/gtt_include/ctm/tonedemod.h @ 597:f18b29e27be5

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First attempt at MCSI voice path automatic switching The function is implemented at the ACI level in both aci2 and aci3, successfully avoids triggering the DSP bug on the first call, but the shutdown of MCSI upon call completion is not working properly yet in either version.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Mar 2019 22:18:35 +0000
parents 945cf7f506b2
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