FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/pstfilt2.c @ 66:824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 03:52:39 +0000 |
parents | 49dd1ac8e75b |
children | 41d8e8f4058d |
rev | line source |
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libgsmefr: import most *.c files from ETSI source
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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 "typedef.h" |
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12 #include "basic_op.h" |
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13 #include "sig_proc.h" |
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14 #include "count.h" |
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15 #include "codec.h" |
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16 #include "cnst.h" |
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17 |
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18 /*---------------------------------------------------------------* |
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19 * Postfilter constant parameters (defined in "cnst.h") * |
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20 *---------------------------------------------------------------* |
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21 * L_FRAME : Frame size. * |
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22 * L_SUBFR : Sub-frame size. * |
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23 * M : LPC order. * |
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24 * MP1 : LPC order+1 * |
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25 * MU : Factor for tilt compensation filter * |
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26 * AGC_FAC : Factor for automatic gain control * |
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27 *---------------------------------------------------------------*/ |
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28 |
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29 #define L_H 22 /* size of truncated impulse response of A(z/g1)/A(z/g2) */ |
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30 |
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31 /*------------------------------------------------------------* |
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32 * static vectors * |
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33 *------------------------------------------------------------*/ |
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34 |
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35 /* inverse filtered synthesis */ |
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36 |
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37 static Word16 res2[L_SUBFR]; |
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38 |
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39 /* memory of filter 1/A(z/0.75) */ |
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40 |
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41 static Word16 mem_syn_pst[M]; |
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42 |
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43 /* Spectral expansion factors */ |
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44 |
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45 const Word16 F_gamma3[M] = |
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46 { |
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47 22938, 16057, 11240, 7868, 5508, |
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48 3856, 2699, 1889, 1322, 925 |
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49 }; |
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50 const Word16 F_gamma4[M] = |
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51 { |
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52 24576, 18432, 13824, 10368, 7776, |
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53 5832, 4374, 3281, 2461, 1846 |
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54 }; |
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55 |
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56 /************************************************************************* |
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57 * |
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58 * FUNCTION: Init_Post_Filter |
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59 * |
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60 * PURPOSE: Initializes the postfilter parameters. |
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61 * |
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62 *************************************************************************/ |
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63 |
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64 void Init_Post_Filter (void) |
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65 { |
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66 Set_zero (mem_syn_pst, M); |
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67 |
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68 Set_zero (res2, L_SUBFR); |
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69 |
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70 return; |
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71 } |
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72 |
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73 /************************************************************************* |
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74 * FUNCTION: Post_Filter() |
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75 * |
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76 * PURPOSE: postfiltering of synthesis speech. |
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77 * |
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78 * DESCRIPTION: |
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79 * The postfiltering process is described as follows: |
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80 * |
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81 * - inverse filtering of syn[] through A(z/0.7) to get res2[] |
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82 * - tilt compensation filtering; 1 - MU*k*z^-1 |
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83 * - synthesis filtering through 1/A(z/0.75) |
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84 * - adaptive gain control |
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85 * |
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86 *************************************************************************/ |
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87 |
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88 void Post_Filter ( |
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89 Word16 *syn, /* in/out: synthesis speech (postfiltered is output) */ |
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90 Word16 *Az_4 /* input: interpolated LPC parameters in all subframes */ |
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91 ) |
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92 { |
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93 /*-------------------------------------------------------------------* |
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94 * Declaration of parameters * |
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95 *-------------------------------------------------------------------*/ |
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96 |
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97 Word16 syn_pst[L_FRAME]; /* post filtered synthesis speech */ |
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98 Word16 Ap3[MP1], Ap4[MP1]; /* bandwidth expanded LP parameters */ |
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99 Word16 *Az; /* pointer to Az_4: */ |
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100 /* LPC parameters in each subframe */ |
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101 Word16 i_subfr; /* index for beginning of subframe */ |
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102 Word16 h[L_H]; |
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103 |
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104 Word16 i; |
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105 Word16 temp1, temp2; |
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106 Word32 L_tmp; |
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107 |
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108 /*-----------------------------------------------------* |
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109 * Post filtering * |
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110 *-----------------------------------------------------*/ |
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111 |
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112 Az = Az_4; |
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113 |
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114 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR) |
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115 { |
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116 /* Find weighted filter coefficients Ap3[] and ap[4] */ |
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117 |
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118 Weight_Ai (Az, F_gamma3, Ap3); |
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119 Weight_Ai (Az, F_gamma4, Ap4); |
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120 |
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121 /* filtering of synthesis speech by A(z/0.7) to find res2[] */ |
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122 |
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123 Residu (Ap3, &syn[i_subfr], res2, L_SUBFR); |
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124 |
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125 /* tilt compensation filter */ |
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126 |
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127 /* impulse response of A(z/0.7)/A(z/0.75) */ |
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128 |
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129 Copy (Ap3, h, M + 1); |
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130 Set_zero (&h[M + 1], L_H - M - 1); |
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131 Syn_filt (Ap4, h, h, L_H, &h[M + 1], 0); |
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132 |
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133 /* 1st correlation of h[] */ |
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134 |
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135 L_tmp = L_mult (h[0], h[0]); |
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136 for (i = 1; i < L_H; i++) |
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137 { |
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138 L_tmp = L_mac (L_tmp, h[i], h[i]); |
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139 } |
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140 temp1 = extract_h (L_tmp); |
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141 |
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142 L_tmp = L_mult (h[0], h[1]); |
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143 for (i = 1; i < L_H - 1; i++) |
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144 { |
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145 L_tmp = L_mac (L_tmp, h[i], h[i + 1]); |
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146 } |
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147 temp2 = extract_h (L_tmp); |
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148 |
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149 test (); |
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150 if (temp2 <= 0) |
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151 { |
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152 temp2 = 0; move16 (); |
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153 } |
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154 else |
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155 { |
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156 temp2 = mult (temp2, MU); |
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157 temp2 = div_s (temp2, temp1); |
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158 } |
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159 |
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160 preemphasis (res2, temp2, L_SUBFR); |
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161 |
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162 /* filtering through 1/A(z/0.75) */ |
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163 |
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164 Syn_filt (Ap4, res2, &syn_pst[i_subfr], L_SUBFR, mem_syn_pst, 1); |
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165 |
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166 /* scale output to input */ |
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167 |
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168 agc (&syn[i_subfr], &syn_pst[i_subfr], AGC_FAC, L_SUBFR); |
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169 |
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170 Az += MP1; |
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171 } |
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172 |
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173 /* update syn[] buffer */ |
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174 |
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175 Copy (&syn[L_FRAME - M], &syn[-M], M); |
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176 |
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177 /* overwrite synthesis speech by postfiltered synthesis speech */ |
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178 |
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179 Copy (syn_pst, syn, L_FRAME); |
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180 |
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181 return; |
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182 } |