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annotate src/e_homing.c @ 8:8b17df8f6340 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 17 Apr 2024 17:30:25 +0000
parents 56410792419a
children
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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 }