FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/int_lpc.h @ 449:2af2b5c12268
Library-versions: libtwamr is officially version 1.0.0
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:43:05 +0000 |
parents | 32bc48faec4b |
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rev | line source |
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libtwamr: integrate int_lpc.c
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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 : int_lpc.h |
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11 * Purpose : Interpolates the LSPs and converts to LPC parameters |
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12 * |
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13 ******************************************************************************** |
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14 */ |
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15 #ifndef int_lpc_h |
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16 #define int_lpc_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 : Int_lpc_1and3 |
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40 * Purpose : Interpolates the LSPs and converts to LPC parameters |
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41 * to get a different LP filter in each subframe. |
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42 * Description : The 20 ms speech frame is divided into 4 subframes. |
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43 * The LSPs are quantized and transmitted at the 2nd and |
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44 * 4th subframes (twice per frame) and interpolated at the |
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45 * 1st and 3rd subframe. |
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46 * |
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47 * |------|------|------|------| |
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48 * sf1 sf2 sf3 sf4 |
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49 * F0 Fm F1 |
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50 * |
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51 * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm |
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52 * sf2: Fm sf4: F1 |
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53 * Returns : void |
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54 * |
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55 ************************************************************************** |
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56 */ |
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57 void Int_lpc_1and3 ( |
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58 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
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59 Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of |
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60 present frame (M) */ |
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61 Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of |
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62 present frame (M) */ |
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63 Word16 Az[] /* o : interpolated LP parameters in all subfr. |
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64 (AZ_SIZE) */ |
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65 ); |
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66 |
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67 /* |
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68 ************************************************************************** |
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69 * |
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70 * Function : Int_lpc_1and3_2 |
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71 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc |
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72 * function but we do not recompute Az() for subframe 2 and |
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73 * 4 because it is already available. |
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74 * Returns : void |
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75 * |
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76 ************************************************************************** |
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77 */ |
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78 void Int_lpc_1and3_2 ( |
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79 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
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80 Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of |
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81 present frame (M) */ |
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82 Word16 lsp_new[], /* i : LSP vector at the 4th subframe of |
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83 present frame (M) */ |
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84 Word16 Az[] /* o :interpolated LP parameters |
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85 in subframes 1 and 3 (AZ_SIZE) */ |
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86 ); |
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87 |
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88 /* |
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89 ************************************************************************** |
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90 * |
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91 * Function : Int_lpc_1to3 |
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92 * Purpose : Interpolates the LSPs and converts to LPC parameters |
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93 * to get a different LP filter in each subframe. |
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94 * Description : The 20 ms speech frame is divided into 4 subframes. |
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95 * The LSPs are quantized and transmitted at the 4th |
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96 * subframes (once per frame) and interpolated at the |
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97 * 1st, 2nd and 3rd subframe. |
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98 * |
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99 * |------|------|------|------| |
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100 * sf1 sf2 sf3 sf4 |
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101 * F0 F1 |
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102 * |
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103 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 |
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104 * sf2: 1/2 F0 + 1/2 F1 sf4: F1 |
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105 * Returns : void |
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106 * |
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107 ************************************************************************** |
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108 */ |
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109 void Int_lpc_1to3 ( |
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110 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ |
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111 Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */ |
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112 Word16 Az[] /* o : interpolated LP parameters in all SFs (AZ_SIZE) */ |
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113 ); |
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114 |
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115 /* |
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116 ************************************************************************** |
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117 * |
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118 * Function : Int_lpc_1to3_2 |
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119 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc |
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120 * function but we do not recompute Az() for subframe 4 |
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121 * because it is already available. |
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122 * Returns : void |
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123 * |
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124 ************************************************************************** |
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125 */ |
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126 void Int_lpc_1to3_2 ( |
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127 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ |
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128 Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */ |
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129 Word16 Az[] /* o :interpolated LP parameters in SFs 1, 2, 3 |
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130 (AZ_SIZE) */ |
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131 ); |
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132 |
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133 #endif |