FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/agc.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
parents | 7b11cbe99a0e |
children |
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 { |
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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 |
54
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108 st->past_gain = gain; |
53
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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 } |