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annotate libtwamr/pstfilt.c @ 515:bb36ef735f25

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author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 30 Aug 2024 08:05:07 +0000
parents 59655481e45b
children
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1 /*************************************************************************
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2 *
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3 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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4 * R99 Version 3.3.0
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5 * REL-4 Version 4.1.0
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6 *
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7 ********************************************************************************
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8 *
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9 * File : pstfilt.c
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10 * Purpose : Performs adaptive postfiltering on the synthesis
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11 * : speech
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12 *
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13 ********************************************************************************
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14 */
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15
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "pstfilt.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "tw_amr.h"
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "memops.h"
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33 #include "weight_a.h"
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34 #include "residu.h"
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35 #include "syn_filt.h"
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36 #include "preemph.h"
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37 #include "no_count.h"
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38 #include "cnst.h"
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39
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40 /*
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41 ********************************************************************************
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42 * LOCAL VARIABLES AND TABLES
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43 ********************************************************************************
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44 */
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45 /*---------------------------------------------------------------*
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46 * Postfilter constant parameters (defined in "cnst.h") *
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47 *---------------------------------------------------------------*
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48 * L_FRAME : Frame size. *
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49 * L_SUBFR : Sub-frame size. *
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50 * M : LPC order. *
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51 * MP1 : LPC order+1 *
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52 * MU : Factor for tilt compensation filter *
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53 * AGC_FAC : Factor for automatic gain control *
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54 *---------------------------------------------------------------*/
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55
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56 #define L_H 22 /* size of truncated impulse response of A(z/g1)/A(z/g2) */
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57
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58 /* Spectral expansion factors */
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59 static const Word16 gamma3_MR122[M] = {
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60 22938, 16057, 11240, 7868, 5508,
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61 3856, 2699, 1889, 1322, 925
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62 };
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63
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64 static const Word16 gamma3[M] = {
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65 18022, 9912, 5451, 2998, 1649, 907, 499, 274, 151, 83
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66 };
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67
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68 static const Word16 gamma4_MR122[M] = {
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69 24576, 18432, 13824, 10368, 7776,
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70 5832, 4374, 3281, 2461, 1846
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71 };
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72
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73 static const Word16 gamma4[M] = {
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74 22938, 16057, 11240, 7868, 5508, 3856, 2699, 1889, 1322, 925
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75 };
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76
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77 /*
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78 ********************************************************************************
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79 * PUBLIC PROGRAM CODE
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80 ********************************************************************************
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81 */
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82
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83 /*************************************************************************
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84 *
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85 * Function: Post_Filter_reset
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86 * Purpose: Initializes state memory to zero
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87 *
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88 **************************************************************************
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89 */
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90 void Post_Filter_reset (Post_FilterState *state)
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91 {
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92 Set_zero (state->mem_syn_pst, M);
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93 Set_zero (state->res2, L_SUBFR);
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94 Set_zero (state->synth_buf, L_FRAME + M);
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95 agc_reset(&state->agc_state);
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96 preemphasis_reset(&state->preemph_state);
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97 }
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98
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99 /*
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100 **************************************************************************
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101 * Function: Post_Filter
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102 * Purpose: postfiltering of synthesis speech.
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103 * Description:
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104 * The postfiltering process is described as follows:
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105 *
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106 * - inverse filtering of syn[] through A(z/0.7) to get res2[]
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107 * - tilt compensation filtering; 1 - MU*k*z^-1
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108 * - synthesis filtering through 1/A(z/0.75)
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109 * - adaptive gain control
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110 *
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111 **************************************************************************
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112 */
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113 int Post_Filter (
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114 Post_FilterState *st, /* i/o : post filter states */
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115 enum Mode mode, /* i : AMR mode */
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116 Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */
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117 Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */
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118 )
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119 {
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120 /*-------------------------------------------------------------------*
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121 * Declaration of parameters *
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122 *-------------------------------------------------------------------*/
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123
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124 Word16 Ap3[MP1], Ap4[MP1]; /* bandwidth expanded LP parameters */
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125 Word16 *Az; /* pointer to Az_4: */
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126 /* LPC parameters in each subframe */
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127 Word16 i_subfr; /* index for beginning of subframe */
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128 Word16 h[L_H];
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129
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130 Word16 i;
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131 Word16 temp1, temp2;
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132 Word32 L_tmp;
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133 Word16 *syn_work = &st->synth_buf[M]; move16 ();
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134
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135 /*-----------------------------------------------------*
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136 * Post filtering *
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137 *-----------------------------------------------------*/
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138
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139 Copy (syn, syn_work , L_FRAME);
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140
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 Az = Az_4;
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Mychaela Falconia <falcon@freecalypso.org>
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142
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Mychaela Falconia <falcon@freecalypso.org>
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143 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
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144 {
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145 /* Find weighted filter coefficients Ap3[] and ap[4] */
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146
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Mychaela Falconia <falcon@freecalypso.org>
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147 test (); test ();
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148 if (sub(mode, MR122) == 0 || sub(mode, MR102) == 0)
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149 {
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150 Weight_Ai (Az, gamma3_MR122, Ap3);
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151 Weight_Ai (Az, gamma4_MR122, Ap4);
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152 }
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parents:
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153 else
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parents:
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154 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 Weight_Ai (Az, gamma3, Ap3);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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156 Weight_Ai (Az, gamma4, Ap4);
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157 }
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158
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Mychaela Falconia <falcon@freecalypso.org>
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159 /* filtering of synthesis speech by A(z/0.7) to find res2[] */
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160
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Mychaela Falconia <falcon@freecalypso.org>
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161 Residu (Ap3, &syn_work[i_subfr], st->res2, L_SUBFR);
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parents:
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162
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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163 /* tilt compensation filter */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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164
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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165 /* impulse response of A(z/0.7)/A(z/0.75) */
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parents:
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166
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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167 Copy (Ap3, h, M + 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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168 Set_zero (&h[M + 1], L_H - M - 1);
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parents:
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169 Syn_filt (Ap4, h, h, L_H, &h[M + 1], 0);
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parents:
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170
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parents:
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171 /* 1st correlation of h[] */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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172
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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173 L_tmp = L_mult (h[0], h[0]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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174 for (i = 1; i < L_H; i++)
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parents:
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175 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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176 L_tmp = L_mac (L_tmp, h[i], h[i]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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177 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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178 temp1 = extract_h (L_tmp);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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180 L_tmp = L_mult (h[0], h[1]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 for (i = 1; i < L_H - 1; i++)
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parents:
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182 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 L_tmp = L_mac (L_tmp, h[i], h[i + 1]);
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parents:
diff changeset
184 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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185 temp2 = extract_h (L_tmp);
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parents:
diff changeset
186
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 test ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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188 if (temp2 <= 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 temp2 = 0; move16 ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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191 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 else
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 {
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 temp2 = mult (temp2, MU);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 temp2 = div_s (temp2, temp1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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196 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 preemphasis (&st->preemph_state, st->res2, temp2, L_SUBFR);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199
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parents:
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200 /* filtering through 1/A(z/0.75) */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 Syn_filt (Ap4, st->res2, &syn[i_subfr], L_SUBFR, st->mem_syn_pst, 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 /* scale output to input */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 agc (&st->agc_state, &syn_work[i_subfr], &syn[i_subfr],
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 AGC_FAC, L_SUBFR);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 Az += MP1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 }
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 /* update syn_work[] buffer */
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 Copy (&syn_work[L_FRAME - M], &syn_work[-M], M);
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 return 0;
59655481e45b libtwamr: integrate pstfilt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 }