FreeCalypso > hg > fc-magnetite
annotate src/cs/layer1/gtt_include/ctm/tonemod.h @ 118:9737224b10e1
r2d_drv_int_ram.lib compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 06 Oct 2016 19:06:08 +0000 |
parents | 945cf7f506b2 |
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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 |