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annotate libtwamr/int_lpc.h @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 32bc48faec4b
children
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32bc48faec4b 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