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annotate libtwamr/lsp_az.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 2ed325c9a507
children
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2ed325c9a507 libtwamr: integrate lsp_az.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 : lsp_az.c
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11 * Purpose : Converts from the line spectral pairs (LSP) to
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12 * : LP coefficients, for a 10th order filter.
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13 * Description :
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14 * - Find the coefficients of F1(z) and F2(z) (see Get_lsp_pol)
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15 * - Multiply F1(z) by 1+z^{-1} and F2(z) by 1-z^{-1}
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16 * - A(z) = ( F1(z) + F2(z) ) / 2
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17 *
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18 ********************************************************************************
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19 */
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20 /*
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21 ********************************************************************************
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22 * MODULE INCLUDE FILE AND VERSION ID
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23 ********************************************************************************
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24 */
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25 #include "namespace.h"
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26 #include "lsp_az.h"
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27 /*
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28 ********************************************************************************
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29 * INCLUDE FILES
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30 ********************************************************************************
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31 */
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32 #include "typedef.h"
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33 #include "basic_op.h"
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34 #include "oper_32b.h"
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35 #include "no_count.h"
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36
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37 /*
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38 ********************************************************************************
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39 * LOCAL VARIABLES AND TABLES
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40 ********************************************************************************
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41 */
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42
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43 /*
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44 ********************************************************************************
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45 * LOCAL PROGRAM CODE
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46 ********************************************************************************
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47 */
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48 /*************************************************************************
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49 *
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50 * FUNCTION: Get_lsp_pol
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51 *
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52 * PURPOSE: Find the polynomial F1(z) or F2(z) from the LSPs.
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53 * If the LSP vector is passed at address 0 F1(z) is computed
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54 * and if it is passed at address 1 F2(z) is computed.
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55 *
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56 * DESCRIPTION:
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57 * This is performed by expanding the product polynomials:
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58 *
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59 * F1(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 )
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60 * i=0,2,4,6,8
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61 * F2(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 )
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62 * i=1,3,5,7,9
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63 *
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64 * where lsp[] is the LSP vector in the cosine domain.
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65 *
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66 * The expansion is performed using the following recursion:
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67 *
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68 * f[0] = 1
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69 * b = -2.0 * lsp[0]
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70 * f[1] = b
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71 * for i=2 to 5 do
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72 * b = -2.0 * lsp[2*i-2];
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73 * f[i] = b*f[i-1] + 2.0*f[i-2];
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74 * for j=i-1 down to 2 do
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75 * f[j] = f[j] + b*f[j-1] + f[j-2];
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76 * f[1] = f[1] + b;
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77 *
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78 *************************************************************************/
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79
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80 static void Get_lsp_pol (Word16 *lsp, Word32 *f)
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81 {
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82 Word16 i, j, hi, lo;
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83 Word32 t0;
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84
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85 /* f[0] = 1.0; */
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86 *f = L_mult (4096, 2048); move32 ();
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87 f++; move32 ();
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88 *f = L_msu ((Word32) 0, *lsp, 512); /* f[1] = -2.0 * lsp[0]; */
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89 f++; move32 ();
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90 lsp += 2; /* Advance lsp pointer */
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91
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92 for (i = 2; i <= 5; i++)
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93 {
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94 *f = f[-2]; move32 ();
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95
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96 for (j = 1; j < i; j++, f--)
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97 {
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98 L_Extract (f[-1], &hi, &lo);
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99 t0 = Mpy_32_16 (hi, lo, *lsp); /* t0 = f[-1] * lsp */
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100 t0 = L_shl (t0, 1);
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101 *f = L_add (*f, f[-2]); move32 (); /* *f += f[-2] */
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102 *f = L_sub (*f, t0);move32 (); /* *f -= t0 */
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103 }
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104 *f = L_msu (*f, *lsp, 512); move32 (); /* *f -= lsp<<9 */
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105 f += i; /* Advance f pointer */
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106 lsp += 2; /* Advance lsp pointer */
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107 }
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108
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109 return;
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110 }
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111
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112 /*
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113 ********************************************************************************
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114 * PUBLIC PROGRAM CODE
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115 ********************************************************************************
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116 */
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117 /*************************************************************************
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118 *
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119 * FUNCTION: Lsp_Az
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120 *
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121 * PURPOSE: Converts from the line spectral pairs (LSP) to
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122 * LP coefficients, for a 10th order filter.
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123 *
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124 * DESCRIPTION:
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125 * - Find the coefficients of F1(z) and F2(z) (see Get_lsp_pol)
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126 * - Multiply F1(z) by 1+z^{-1} and F2(z) by 1-z^{-1}
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127 * - A(z) = ( F1(z) + F2(z) ) / 2
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128 *
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129 *************************************************************************/
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130 void Lsp_Az (
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131 Word16 lsp[], /* (i) : line spectral frequencies */
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132 Word16 a[] /* (o) : predictor coefficients (order = 10) */
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133 )
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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134 {
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 Word16 i, j;
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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136 Word32 f1[6], f2[6];
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 Word32 t0;
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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138
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 Get_lsp_pol (&lsp[0], f1);
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 Get_lsp_pol (&lsp[1], f2);
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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141
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 for (i = 5; i > 0; i--)
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 {
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 f1[i] = L_add (f1[i], f1[i - 1]); move32 (); /* f1[i] += f1[i-1]; */
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 f2[i] = L_sub (f2[i], f2[i - 1]); move32 (); /* f2[i] -= f2[i-1]; */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 }
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 a[0] = 4096; move16 ();
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 for (i = 1, j = 10; i <= 5; i++, j--)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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150 {
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 t0 = L_add (f1[i], f2[i]); /* f1[i] + f2[i] */
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 a[i] = extract_l (L_shr_r (t0, 13)); move16 ();
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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153 t0 = L_sub (f1[i], f2[i]); /* f1[i] - f2[i] */
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 a[j] = extract_l (L_shr_r (t0, 13)); move16 ();
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 }
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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156
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 return;
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 }
2ed325c9a507 libtwamr: integrate lsp_az.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159