FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/b_cn_cod.h @ 358:7bea058d0640
libtwamr: integrate dec_lag6.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 05 May 2024 22:44:00 +0000 |
parents | 07f936338de1 |
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1 /* |
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2 ******************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ******************************************************************************** |
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9 * |
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10 * File : b_cn_cod.h |
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11 * Purpose : Contains function for comfort noise generation. |
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12 * |
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13 ******************************************************************************** |
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14 */ |
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15 #ifndef b_cn_cod_h |
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16 #define b_cn_cod_h "$Id $" |
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17 |
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18 /* |
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19 ******************************************************************************** |
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20 * INCLUDE FILES |
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21 ******************************************************************************** |
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22 */ |
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23 #include "typedef.h" |
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24 |
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25 /* |
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26 ******************************************************************************** |
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27 * DEFINITION OF DATA TYPES |
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28 ******************************************************************************** |
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29 */ |
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30 |
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31 /* |
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32 ******************************************************************************** |
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33 * DECLARATION OF PROTOTYPES |
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34 ******************************************************************************** |
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35 */ |
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36 |
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37 /************************************************************************* |
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38 * |
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39 * FUNCTION NAME: pseudonoise |
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40 * |
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41 * PURPOSE: Generate a random integer value to use in comfort noise |
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42 * generation. The algorithm uses polynomial x^31 + x^3 + 1 |
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43 * (length of PN sequence is 2^31 - 1). |
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44 * |
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45 * INPUTS: *shift_reg Old CN generator shift register state |
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46 * |
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47 * |
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48 * OUTPUTS: *shift_reg Updated CN generator shift register state |
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49 * |
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50 * RETURN VALUE: Generated random integer value |
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51 * |
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52 *************************************************************************/ |
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53 |
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54 Word16 pseudonoise ( |
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55 Word32 *shift_reg, /* i/o : Old CN generator shift register state */ |
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56 Word16 no_bits /* i : Number of bits */ |
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57 ); |
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58 |
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59 /************************************************************************* |
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60 * |
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61 * FUNCTION NAME: build_CN_code |
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62 * |
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63 * PURPOSE: Compute the comfort noise fixed codebook excitation. The |
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64 * gains of the pulses are always +/-1. |
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65 * |
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66 * INPUTS: *seed Old CN generator shift register state |
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67 * |
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68 * OUTPUTS: cod[0..39] Generated comfort noise fixed codebook vector |
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69 * *seed Updated CN generator shift register state |
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70 * |
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71 * RETURN VALUE: none |
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72 * |
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73 *************************************************************************/ |
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74 void build_CN_code ( |
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75 Word32 *seed, /* i/o : Old CN generator shift register state */ |
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76 Word16 cod[] /* o : Generated CN fixed codebook vector */ |
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77 ); |
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78 |
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79 /************************************************************************* |
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80 * |
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81 * FUNCTION NAME: build_CN_param |
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82 * |
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83 * PURPOSE: Randomize the speech parameters. So that they |
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84 * do not produce tonal artifacts if used by ECU. |
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85 * |
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86 * INPUTS: *seed Old CN generator shift register state |
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87 * n_param, Number of parameters to randomize |
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88 * parm_size_table, |
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89 * |
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90 * |
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91 * OUTPUTS: parm CN Generated Parameters |
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92 * *seed Updated CN generator shift register state |
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93 * |
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94 * RETURN VALUE: none |
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95 * |
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96 *************************************************************************/ |
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97 void build_CN_param ( |
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98 Word16 *seed, /* i/o : Old CN generator shift register state */ |
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99 const Word16 n_param, /* i : number of params */ |
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100 const Word16 param_size_table[], /* i : size of params */ |
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101 Word16 parm[] /* o : CN Generated Params*/ |
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102 ); |
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103 |
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104 #endif |