FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/agc.c @ 91:de9dc80c1312
libgsmefr: residu.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 17:51:46 +0000 |
parents | 7b11cbe99a0e |
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rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: agc |
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4 * |
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5 * PURPOSE: Scales the postfilter output on a subframe basis by automatic |
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6 * control of the subframe gain. |
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7 * |
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8 * DESCRIPTION: |
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9 * sig_out[n] = sig_out[n] * gain[n]; |
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10 * where gain[n] is the gain at the nth sample given by |
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11 * gain[n] = agc_fac * gain[n-1] + (1 - agc_fac) g_in/g_out |
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12 * g_in/g_out is the square root of the ratio of energy at the input |
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13 * and output of the postfilter. |
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14 * |
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15 *************************************************************************/ |
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16 |
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17 #include "gsm_efr.h" |
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18 #include "typedef.h" |
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19 #include "namespace.h" |
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20 #include "basic_op.h" |
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21 #include "no_count.h" |
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22 #include "cnst.h" |
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23 #include "dec_state.h" |
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24 #include "sig_proc.h" |
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25 |
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26 void agc ( |
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27 struct EFR_decoder_state *st, |
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28 Word16 *sig_in, /* (i) : postfilter input signal */ |
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29 Word16 *sig_out, /* (i/o) : postfilter output signal */ |
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30 Word16 agc_fac, /* (i) : AGC factor */ |
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31 Word16 l_trm /* (i) : subframe size */ |
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32 ) |
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33 { |
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34 Word16 i, exp; |
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35 Word16 gain_in, gain_out, g0, gain; |
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36 Word32 s; |
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37 |
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38 Word16 temp; |
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39 |
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40 /* calculate gain_out with exponent */ |
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41 |
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42 temp = shr (sig_out[0], 2); |
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43 s = L_mult (temp, temp); |
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44 |
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45 for (i = 1; i < l_trm; i++) |
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46 { |
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47 temp = shr (sig_out[i], 2); |
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48 s = L_mac (s, temp, temp); |
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49 } |
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50 |
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51 if (s == 0) |
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52 { |
54
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53 st->past_gain = 0; |
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54 return; |
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55 } |
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56 exp = sub (norm_l (s), 1); |
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57 gain_out = round (L_shl (s, exp)); |
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58 |
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59 /* calculate gain_in with exponent */ |
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60 |
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61 temp = shr (sig_in[0], 2); |
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62 s = L_mult (temp, temp); |
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63 |
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64 for (i = 1; i < l_trm; i++) |
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65 { |
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66 temp = shr (sig_in[i], 2); |
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67 s = L_mac (s, temp, temp); |
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68 } |
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69 |
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70 if (s == 0) |
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71 { |
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72 g0 = 0; |
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73 } |
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74 else |
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75 { |
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76 i = norm_l (s); |
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77 gain_in = round (L_shl (s, i)); |
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78 exp = sub (exp, i); |
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79 |
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80 /*---------------------------------------------------* |
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81 * g0 = (1-agc_fac) * sqrt(gain_in/gain_out); * |
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82 *---------------------------------------------------*/ |
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83 |
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84 s = L_deposit_l (div_s (gain_out, gain_in)); |
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85 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
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86 s = L_shr (s, exp); /* add exponent */ |
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87 |
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88 s = Inv_sqrt (s); |
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89 i = round (L_shl (s, 9)); |
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90 |
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91 /* g0 = i * (1-agc_fac) */ |
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92 g0 = mult (i, sub (32767, agc_fac)); |
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93 } |
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94 |
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95 /* compute gain[n] = agc_fac * gain[n-1] |
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96 + (1-agc_fac) * sqrt(gain_in/gain_out) */ |
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97 /* sig_out[n] = gain[n] * sig_out[n] */ |
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98 |
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99 gain = st->past_gain; |
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100 |
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101 for (i = 0; i < l_trm; i++) |
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102 { |
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103 gain = mult (gain, agc_fac); |
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104 gain = add (gain, g0); |
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105 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], gain), 3)); |
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106 } |
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107 |
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108 st->past_gain = gain; |
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109 |
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110 return; |
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111 } |
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112 |
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113 void agc2 ( |
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114 Word16 *sig_in, /* (i) : postfilter input signal */ |
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115 Word16 *sig_out, /* (i/o) : postfilter output signal */ |
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116 Word16 l_trm /* (i) : subframe size */ |
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117 ) |
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118 { |
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119 Word16 i, exp; |
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120 Word16 gain_in, gain_out, g0; |
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121 Word32 s; |
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122 |
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123 Word16 temp; |
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124 |
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125 /* calculate gain_out with exponent */ |
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126 |
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127 temp = shr (sig_out[0], 2); |
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128 s = L_mult (temp, temp); |
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129 for (i = 1; i < l_trm; i++) |
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130 { |
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131 temp = shr (sig_out[i], 2); |
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132 s = L_mac (s, temp, temp); |
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133 } |
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134 |
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135 test (); |
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136 if (s == 0) |
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137 { |
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138 return; |
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139 } |
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140 exp = sub (norm_l (s), 1); |
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141 gain_out = round (L_shl (s, exp)); |
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142 |
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143 /* calculate gain_in with exponent */ |
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144 |
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145 temp = shr (sig_in[0], 2); |
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146 s = L_mult (temp, temp); |
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147 for (i = 1; i < l_trm; i++) |
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148 { |
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149 temp = shr (sig_in[i], 2); |
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150 s = L_mac (s, temp, temp); |
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151 } |
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152 |
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153 test (); |
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154 if (s == 0) |
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155 { |
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156 g0 = 0; move16 (); |
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157 } |
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158 else |
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159 { |
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160 i = norm_l (s); |
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161 gain_in = round (L_shl (s, i)); |
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162 exp = sub (exp, i); |
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163 |
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164 /*---------------------------------------------------* |
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165 * g0 = sqrt(gain_in/gain_out); * |
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166 *---------------------------------------------------*/ |
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167 |
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168 s = L_deposit_l (div_s (gain_out, gain_in)); |
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169 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
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170 s = L_shr (s, exp); /* add exponent */ |
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171 |
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172 s = Inv_sqrt (s); |
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173 g0 = round (L_shl (s, 9)); |
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174 } |
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175 |
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176 /* sig_out(n) = gain(n) sig_out(n) */ |
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177 |
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178 for (i = 0; i < l_trm; i++) |
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179 { |
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180 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], g0), 3)); |
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181 move16 (); |
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182 } |
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183 |
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184 return; |
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185 } |