FreeCalypso > hg > efr-experiments
annotate src/agc_amr.c @ 8:8b17df8f6340 default tip
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author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 17 Apr 2024 17:30:25 +0000 |
parents | c511bfb36c2a |
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rev | line source |
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2
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1 /* |
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2 ***************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ***************************************************************************** |
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9 * |
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10 * File : agc.c |
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11 * |
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12 ***************************************************************************** |
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13 */ |
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14 |
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15 /* |
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16 ***************************************************************************** |
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17 * MODULE INCLUDE FILE AND VERSION ID |
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18 ***************************************************************************** |
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19 */ |
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20 #if 0 |
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21 #include "agc.h" |
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22 const char agc_id[] = "@(#)$Id $" agc_h; |
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23 #endif |
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24 |
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25 /* |
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26 ***************************************************************************** |
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27 * INCLUDE FILES |
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28 ***************************************************************************** |
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29 */ |
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30 #include <stdlib.h> |
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31 #include <stdio.h> |
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32 #include "typedef.h" |
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33 #include "basic_op.h" |
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34 #include "count.h" |
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35 #include "sig_proc.h" |
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36 #include "cnst.h" |
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37 |
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38 Word16 past_gain; /* initial value of past_gain = 1.0 */ |
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39 |
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40 /* |
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41 ***************************************************************************** |
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42 * LOCAL PROGRAM CODE |
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43 ***************************************************************************** |
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44 */ |
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45 |
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46 static Word32 energy_old( /* o : return energy of signal */ |
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47 Word16 in[], /* i : input signal (length l_trm) */ |
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48 Word16 l_trm /* i : signal length */ |
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49 ) |
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50 { |
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51 Word32 s; |
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52 Word16 i, temp; |
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53 |
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54 temp = shr (in[0], 2); |
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55 s = L_mult (temp, temp); |
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56 |
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57 for (i = 1; i < l_trm; i++) |
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58 { |
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59 temp = shr (in[i], 2); |
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60 s = L_mac (s, temp, temp); |
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61 } |
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62 |
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63 return s; |
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64 } |
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65 |
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66 static Word32 energy_new( /* o : return energy of signal */ |
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67 Word16 in[], /* i : input signal (length l_trm) */ |
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68 Word16 l_trm /* i : signal length */ |
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69 ) |
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70 { |
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71 Word32 s; |
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72 Word16 i; |
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73 Flag ov_save; |
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74 |
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75 ov_save = Overflow; move16 (); /* save overflow flag in case energy_old */ |
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76 /* must be called */ |
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77 s = L_mult(in[0], in[0]); |
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78 for (i = 1; i < l_trm; i++) |
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79 { |
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80 s = L_mac(s, in[i], in[i]); |
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81 } |
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82 |
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83 /* check for overflow */ |
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84 test (); |
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85 if (L_sub (s, MAX_32) == 0L) |
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86 { |
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87 Overflow = ov_save; move16 (); /* restore overflow flag */ |
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88 s = energy_old (in, l_trm); move32 (); /* function result */ |
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89 } |
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90 else |
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91 { |
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92 s = L_shr(s, 4); |
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93 } |
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94 |
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95 return s; |
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96 } |
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97 /* |
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98 ***************************************************************************** |
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99 * PUBLIC PROGRAM CODE |
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100 ***************************************************************************** |
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101 */ |
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102 |
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103 /* |
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104 ************************************************************************** |
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105 * |
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106 * Function : agc |
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107 * Purpose : Scales the postfilter output on a subframe basis |
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108 * |
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109 ************************************************************************** |
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110 */ |
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111 void agc ( |
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112 Word16 *sig_in, /* i : postfilter input signal (l_trm) */ |
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113 Word16 *sig_out, /* i/o : postfilter output signal (l_trm) */ |
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114 Word16 agc_fac, /* i : AGC factor */ |
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115 Word16 l_trm /* i : subframe size */ |
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116 ) |
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117 { |
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118 Word16 i, exp; |
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119 Word16 gain_in, gain_out, g0, gain; |
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120 Word32 s; |
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121 |
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122 /* calculate gain_out with exponent */ |
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123 s = energy_new(sig_out, l_trm); move32 (); /* function result */ |
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124 |
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125 test (); |
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126 if (s == 0) |
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127 { |
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128 past_gain = 0; move16 (); |
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129 return; |
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130 } |
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131 exp = sub (norm_l (s), 1); |
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132 gain_out = round (L_shl (s, exp)); |
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133 |
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134 /* calculate gain_in with exponent */ |
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135 s = energy_new(sig_in, l_trm); move32 (); /* function result */ |
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136 |
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137 test (); |
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138 if (s == 0) |
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139 { |
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140 g0 = 0; move16 (); |
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141 } |
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142 else |
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143 { |
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144 i = norm_l (s); |
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145 gain_in = round (L_shl (s, i)); |
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146 exp = sub (exp, i); |
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147 |
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148 /*---------------------------------------------------* |
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149 * g0 = (1-agc_fac) * sqrt(gain_in/gain_out); * |
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150 *---------------------------------------------------*/ |
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151 |
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152 s = L_deposit_l (div_s (gain_out, gain_in)); |
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153 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
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154 s = L_shr (s, exp); /* add exponent */ |
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155 |
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|
156 s = Inv_sqrt (s); move32 (); /* function result */ |
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|
157 i = round (L_shl (s, 9)); |
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|
158 |
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|
159 /* g0 = i * (1-agc_fac) */ |
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parents:
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|
160 g0 = mult (i, sub (32767, agc_fac)); |
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|
161 } |
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162 |
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163 /* compute gain[n] = agc_fac * gain[n-1] |
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|
164 + (1-agc_fac) * sqrt(gain_in/gain_out) */ |
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parents:
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|
165 /* sig_out[n] = gain[n] * sig_out[n] */ |
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|
166 |
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|
167 gain = past_gain; move16 (); |
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|
168 |
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|
169 for (i = 0; i < l_trm; i++) |
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diff
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|
170 { |
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|
171 gain = mult (gain, agc_fac); |
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|
172 gain = add (gain, g0); |
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|
173 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], gain), 3)); |
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parents:
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|
174 move16 (); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
175 } |
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parents:
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|
176 |
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parents:
diff
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|
177 past_gain = gain; move16 (); |
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|
178 } |
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|
179 |
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|
180 /* |
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parents:
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|
181 ************************************************************************** |
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|
182 * |
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|
183 * Function : agc2 |
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Mychaela Falconia <falcon@freecalypso.org>
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|
184 * Purpose : Scales the excitation on a subframe basis |
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|
185 * |
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|
186 ************************************************************************** |
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|
187 */ |
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|
188 void agc2 ( |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
189 Word16 *sig_in, /* i : postfilter input signal */ |
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beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
190 Word16 *sig_out, /* i/o : postfilter output signal */ |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
191 Word16 l_trm /* i : subframe size */ |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
192 ) |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
193 { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
194 Word16 i, exp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
195 Word16 gain_in, gain_out, g0; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
196 Word32 s; |
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|
197 |
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parents:
diff
changeset
|
198 /* calculate gain_out with exponent */ |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
199 s = energy_new(sig_out, l_trm); move32 (); /* function result */ |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
200 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
201 test (); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
202 if (s == 0) |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
203 { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
204 return; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
205 } |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
206 exp = sub (norm_l (s), 1); |
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parents:
diff
changeset
|
207 gain_out = round (L_shl (s, exp)); |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
208 |
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parents:
diff
changeset
|
209 /* calculate gain_in with exponent */ |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
210 s = energy_new(sig_in, l_trm); move32 (); /* function result */ |
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Mychaela Falconia <falcon@freecalypso.org>
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diff
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|
211 |
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parents:
diff
changeset
|
212 test (); |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
213 if (s == 0) |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
214 { |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
215 g0 = 0; move16 (); |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
216 } |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
217 else |
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parents:
diff
changeset
|
218 { |
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beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
219 i = norm_l (s); |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
220 gain_in = round (L_shl (s, i)); |
c511bfb36c2a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
221 exp = sub (exp, i); |
c511bfb36c2a
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parents:
diff
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|
222 |
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parents:
diff
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|
223 /*---------------------------------------------------* |
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parents:
diff
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|
224 * g0 = sqrt(gain_in/gain_out); * |
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beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
225 *---------------------------------------------------*/ |
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beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
226 |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
227 s = L_deposit_l (div_s (gain_out, gain_in)); |
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beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
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228 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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229 s = L_shr (s, exp); /* add exponent */ |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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230 |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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231 s = Inv_sqrt (s); move32 (); /* function result */ |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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232 g0 = round (L_shl (s, 9)); |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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233 } |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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234 |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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235 /* sig_out(n) = gain(n) sig_out(n) */ |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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236 |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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237 for (i = 0; i < l_trm; i++) |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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238 { |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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239 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], g0), 3)); |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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240 move16 (); |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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241 } |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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242 |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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243 return; |
c511bfb36c2a
beginning of EFR2 decoder, using AMR version of AGC module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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244 } |