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annotate src/cs/layer1/gtt_include/ctm/tonemod.h @ 1:5a26a267684f

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targets: new minimal headers created
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:45:24 +0000
parents 92470e5d0b9e
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 * Changes since October 13, 2000:
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13 * - The type mod_state_t includes a new member txbits_fifo_state now.
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14 *
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15 *******************************************************************************
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16 *
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17 * File : tonemod.h
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18 * Purpose : header file for tonemod.c
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19 *
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20 *******************************************************************************
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21 */
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22
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23 #ifndef tonemod_h
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24 #define tonemod_h "$Id: $"
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25
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26 /*
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27 *******************************************************************************
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28 * INCLUDE FILES
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29 *******************************************************************************
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30 */
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31
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32 #include <fifo.h>
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33
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34 /*
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35 *******************************************************************************
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36 * DECLARATION OF PROTOTYPES
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37 *******************************************************************************
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38 */
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39
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40
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41 /* Define a type for the state variable of the function tonemod() */
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42
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43 typedef struct {
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44 WORD16 cntModulatedSamples;
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45 WORD16 actualBits[2];
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46 fifo_state_t txbits_fifo_state;
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47 } mod_state_t;
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48
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49
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50 /* ---------------------------------------------------------------------- */
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51 /* Function init_tonemod() */
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52 /* *********************** */
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53 /* This function has to be executed before tonemod() can be used. */
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54 /* ---------------------------------------------------------------------- */
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55
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56 void init_tonemod(mod_state_t *mod_state);
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57
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58
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59 /* ---------------------------------------------------------------------- */
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60 /* Function tonemod() */
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61 /* ****************** */
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62 /* Modulator of the Cellular Text Telephone Modem. */
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63 /* The input vector bits_in must contain the bits that have to be */
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64 /* transmitted. The length of bits_in must be even because always two */
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65 /* bits are coded in parallel. */
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66 /* Bits are either unipolar (i.e. {0, 1}) or bipolar (i.e. {-1, +1)}. */
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67 /* The length of the output vector tones_out must be 20 times longer than */
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68 /* the length of bits_in, since each pair of two bits is coded within a */
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69 /* frame of 40 audio samples. */
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70 /* ---------------------------------------------------------------------- */
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71
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72 void tonemod(WORD16 *tones_out,
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73 WORD16 *bits_in,
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74 WORD16 num_samples_tones_out,
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75 WORD16 num_bits_in,
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76 mod_state_t *mod_state);
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77
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78 #endif