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annotate libgsmefr/pstfilt2.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +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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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 }