FreeCalypso > hg > efr-experiments
annotate src/e_homing.c @ 0:56410792419a
src: original EFR source from ETSI
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 03 Apr 2024 05:31:37 +0000 |
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56410792419a
src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
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1 /************************************************************************** |
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2 * |
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3 * File Name: e_homing.c |
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4 * |
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5 * Purpose: |
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6 * This file contains the following functions: |
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7 * |
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8 * encoder_homing_frame_test() checks if a frame of input samples |
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9 * matches the Encoder Homing Frame pattern. |
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10 * |
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11 * encoder_reset() called by reset_enc() to reset all |
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12 * the state variables for the encoder. |
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13 * |
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14 * reset_enc() calls functions to reset the state |
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15 * variables for the encoder and VAD, and |
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16 * for the transmit DTX and Comfort Noise. |
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17 * |
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18 **************************************************************************/ |
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19 |
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20 #include "typedef.h" |
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21 #include "cnst.h" |
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22 #include "vad.h" |
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23 #include "dtx.h" |
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24 #include "codec.h" |
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25 #include "sig_proc.h" |
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26 #include "e_homing.h" |
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27 |
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28 /*************************************************************************** |
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29 * |
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30 * FUNCTION NAME: encoder_homing_frame_test |
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31 * |
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32 * PURPOSE: |
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33 * Checks if a frame of input samples matches the Encoder Homing Frame |
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34 * pattern, which is 0x0008 for all 160 samples in the frame. |
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35 * |
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36 * INPUT: |
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37 * input_frame[] one frame of speech samples |
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38 * |
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39 * OUTPUT: |
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40 * None |
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41 * |
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42 * RETURN: |
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43 * 0 input frame does not match the Encoder Homing Frame pattern. |
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44 * 1 input frame matches the Encoder Homing Frame pattern. |
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45 * |
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46 **************************************************************************/ |
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47 |
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48 Word16 encoder_homing_frame_test (Word16 input_frame[]) |
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49 { |
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50 Word16 i, j; |
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51 |
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52 for (i = 0; i < L_FRAME; i++) |
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53 { |
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54 j = input_frame[i] ^ EHF_MASK; |
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55 |
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56 if (j) |
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57 break; |
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58 } |
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59 |
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60 return !j; |
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61 } |
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62 |
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63 /*************************************************************************** |
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64 * |
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65 * FUNCTION NAME: encoder_reset |
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66 * |
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67 * PURPOSE: |
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68 * resets all of the state variables for the encoder |
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69 * |
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70 * INPUT: |
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71 * None |
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72 * |
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73 * OUTPUT: |
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74 * None |
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75 * |
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76 * RETURN: |
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77 * None |
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78 * |
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79 **************************************************************************/ |
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80 |
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81 void encoder_reset (void) |
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82 { |
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83 /* External declarations for encoder variables which need to be reset */ |
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84 |
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85 /* Variables defined in levinson.c */ |
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86 /* ------------------------------- */ |
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87 extern Word16 old_A[M + 1]; /* Last A(z) for case of unstable filter */ |
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88 |
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89 /* Variables defined in q_gains.c */ |
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90 /* ------------------------------- */ |
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91 /* Memories of gain quantization: */ |
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92 extern Word16 past_qua_en[4], pred[4]; |
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93 |
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94 /* Variables defined in q_plsf_5.c */ |
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95 /* ------------------------------- */ |
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96 /* Past quantized prediction error */ |
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97 extern Word16 past_r2_q[M]; |
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98 |
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99 Word16 i; |
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100 |
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101 /* reset all the encoder state variables */ |
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102 /* ------------------------------------- */ |
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103 |
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104 /* Variables in cod_12k2.c: */ |
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105 Init_Coder_12k2 (); |
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106 |
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107 /* Variables in levinson.c: */ |
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108 old_A[0] = 4096; /* Last A(z) for case of unstable filter */ |
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109 for (i = 1; i < M + 1; i++) |
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110 { |
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111 old_A[i] = 0; |
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112 } |
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113 |
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114 /* Variables in pre_proc.c: */ |
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115 Init_Pre_Process (); |
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116 |
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117 /* Variables in q_gains.c: */ |
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118 for (i = 0; i < 4; i++) |
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119 { |
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120 past_qua_en[i] = -2381; /* past quantized energies */ |
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121 } |
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122 |
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123 pred[0] = 44; /* MA prediction coeff */ |
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124 pred[1] = 37; /* MA prediction coeff */ |
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125 pred[2] = 22; /* MA prediction coeff */ |
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126 pred[3] = 12; /* MA prediction coeff */ |
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127 |
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128 /* Variables in q_plsf_5.c: */ |
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129 for (i = 0; i < M; i++) |
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130 { |
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131 past_r2_q[i] = 0; /* Past quantized prediction error */ |
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132 } |
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133 |
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134 return; |
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135 } |
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136 |
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137 /*************************************************************************** |
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138 * |
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139 * FUNCTION NAME: reset_enc |
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140 * |
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141 * PURPOSE: |
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142 * resets all of the state variables for the encoder and VAD, and for |
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143 * the transmit DTX and Comfort Noise. |
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144 * |
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145 * INPUT: |
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146 * None |
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147 * |
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148 * OUTPUT: |
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149 * None |
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150 * |
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151 * RETURN: |
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152 * None |
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153 * |
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154 **************************************************************************/ |
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155 |
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156 void reset_enc (void) |
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157 { |
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158 encoder_reset (); /* reset all the state variables in the speech encoder*/ |
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159 vad_reset (); /* reset all the VAD state variables */ |
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160 reset_tx_dtx (); /* reset all the transmit DTX and CN variables */ |
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161 |
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162 return; |
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163 } |