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annotate libgsmefr/pstfilt2.c @ 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 41d8e8f4058d
children
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1 /*************************************************************************
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2 *
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3 * FILE NAME: pstfilt2.c
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4 *
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5 * Performs adaptive postfiltering on the synthesis speech
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6 *
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7 * FUNCTIONS INCLUDED: Init_Post_Filter() and Post_Filter()
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8 *
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9 *************************************************************************/
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10
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11 #include "gsm_efr.h"
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12 #include "typedef.h"
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13 #include "namespace.h"
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14 #include "basic_op.h"
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15 #include "sig_proc.h"
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16 #include "memops.h"
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17 #include "no_count.h"
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18 #include "codec.h"
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19 #include "cnst.h"
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20 #include "dec_state.h"
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21
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22 /*---------------------------------------------------------------*
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23 * Postfilter constant parameters (defined in "cnst.h") *
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24 *---------------------------------------------------------------*
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25 * L_FRAME : Frame size. *
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26 * L_SUBFR : Sub-frame size. *
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27 * M : LPC order. *
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28 * MP1 : LPC order+1 *
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29 * MU : Factor for tilt compensation filter *
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30 * AGC_FAC : Factor for automatic gain control *
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31 *---------------------------------------------------------------*/
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32
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33 #define L_H 22 /* size of truncated impulse response of A(z/g1)/A(z/g2) */
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34
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35 /*------------------------------------------------------------*
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36 * static vectors *
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37 *------------------------------------------------------------*/
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38
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39 /* Spectral expansion factors */
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40
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41 const Word16 F_gamma3[M] =
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42 {
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43 22938, 16057, 11240, 7868, 5508,
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44 3856, 2699, 1889, 1322, 925
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45 };
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46 const Word16 F_gamma4[M] =
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47 {
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48 24576, 18432, 13824, 10368, 7776,
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49 5832, 4374, 3281, 2461, 1846
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50 };
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51
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52 /*************************************************************************
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53 *
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54 * FUNCTION: Init_Post_Filter
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55 *
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56 * PURPOSE: Initializes the postfilter parameters.
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57 *
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58 *************************************************************************/
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59
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60 void Init_Post_Filter (struct EFR_decoder_state *st)
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61 {
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62 Set_zero (st->mem_syn_pst, M);
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63
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64 Set_zero (st->res2, L_SUBFR);
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66 return;
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67 }
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69 /*************************************************************************
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70 * FUNCTION: Post_Filter()
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71 *
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72 * PURPOSE: postfiltering of synthesis speech.
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73 *
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74 * DESCRIPTION:
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75 * The postfiltering process is described as follows:
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76 *
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77 * - inverse filtering of syn[] through A(z/0.7) to get res2[]
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78 * - tilt compensation filtering; 1 - MU*k*z^-1
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79 * - synthesis filtering through 1/A(z/0.75)
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80 * - adaptive gain control
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81 *
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82 *************************************************************************/
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83
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84 void Post_Filter (
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85 struct EFR_decoder_state *st,
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86 Word16 *syn, /* in/out: synthesis speech (postfiltered is output) */
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87 Word16 *Az_4 /* input: interpolated LPC parameters in all subframes */
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88 )
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89 {
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90 /*-------------------------------------------------------------------*
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91 * Declaration of parameters *
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92 *-------------------------------------------------------------------*/
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93
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94 Word16 syn_pst[L_FRAME]; /* post filtered synthesis speech */
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95 Word16 Ap3[MP1], Ap4[MP1]; /* bandwidth expanded LP parameters */
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96 Word16 *Az; /* pointer to Az_4: */
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97 /* LPC parameters in each subframe */
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98 Word16 i_subfr; /* index for beginning of subframe */
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99 Word16 h[L_H];
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100
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101 Word16 i;
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102 Word16 temp1, temp2;
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103 Word32 L_tmp;
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104
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105 /*-----------------------------------------------------*
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106 * Post filtering *
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107 *-----------------------------------------------------*/
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108
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109 Az = Az_4;
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110
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111 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
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112 {
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113 /* Find weighted filter coefficients Ap3[] and ap[4] */
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114
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115 Weight_Ai (Az, F_gamma3, Ap3);
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116 Weight_Ai (Az, F_gamma4, Ap4);
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117
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118 /* filtering of synthesis speech by A(z/0.7) to find res2[] */
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119
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120 Residu (Ap3, &syn[i_subfr], st->res2, L_SUBFR);
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121
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122 /* tilt compensation filter */
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123
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124 /* impulse response of A(z/0.7)/A(z/0.75) */
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125
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126 Copy (Ap3, h, M + 1);
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127 Set_zero (&h[M + 1], L_H - M - 1);
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128 Syn_filt (Ap4, h, h, L_H, &h[M + 1], 0);
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129
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130 /* 1st correlation of h[] */
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131
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132 L_tmp = L_mult (h[0], h[0]);
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133 for (i = 1; i < L_H; i++)
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134 {
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135 L_tmp = L_mac (L_tmp, h[i], h[i]);
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136 }
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137 temp1 = extract_h (L_tmp);
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138
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139 L_tmp = L_mult (h[0], h[1]);
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140 for (i = 1; i < L_H - 1; i++)
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141 {
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142 L_tmp = L_mac (L_tmp, h[i], h[i + 1]);
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143 }
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144 temp2 = extract_h (L_tmp);
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145
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146 test ();
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147 if (temp2 <= 0)
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148 {
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149 temp2 = 0; move16 ();
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150 }
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151 else
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152 {
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153 temp2 = mult (temp2, MU);
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154 temp2 = div_s (temp2, temp1);
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155 }
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156
87
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157 preemphasis (st, st->res2, temp2, L_SUBFR);
53
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158
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159 /* filtering through 1/A(z/0.75) */
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160
87
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161 Syn_filt (Ap4, st->res2, &syn_pst[i_subfr], L_SUBFR,
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162 st->mem_syn_pst, 1);
53
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163
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164 /* scale output to input */
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165
87
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166 agc (st, &syn[i_subfr], &syn_pst[i_subfr], AGC_FAC, L_SUBFR);
53
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167
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168 Az += MP1;
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169 }
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170
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171 /* update syn[] buffer */
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172
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173 Copy (&syn[L_FRAME - M], &syn[-M], M);
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174
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175 /* overwrite synthesis speech by postfiltered synthesis speech */
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176
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177 Copy (syn_pst, syn, L_FRAME);
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178
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179 return;
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180 }