FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/cor_h.c @ 480:332397bc80aa
doc/AMR-library-API: document public const data items
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 19 May 2024 23:18:17 +0000 |
parents | 5401aaf7acb0 |
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rev | line source |
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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 : cor_h.c |
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11 * Purpose : correlation functions for codebook search |
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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 #include "namespace.h" |
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21 #include "cor_h.h" |
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22 /* |
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23 ***************************************************************************** |
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24 * INCLUDE FILES |
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25 ***************************************************************************** |
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26 */ |
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27 #include "typedef.h" |
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28 #include "basic_op.h" |
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29 #include "no_count.h" |
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30 #include "inv_sqrt.h" |
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31 #include "cnst.h" |
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32 |
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33 /* |
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34 ***************************************************************************** |
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35 * PUBLIC PROGRAM CODE |
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36 ***************************************************************************** |
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37 */ |
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38 /************************************************************************* |
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39 * |
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40 * FUNCTION: cor_h_x() |
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41 * |
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42 * PURPOSE: Computes correlation between target signal "x[]" and |
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43 * impulse response"h[]". |
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44 * |
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45 * DESCRIPTION: |
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46 * The correlation is given by: |
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47 * d[n] = sum_{i=n}^{L-1} x[i] h[i-n] n=0,...,L-1 |
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48 * |
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49 * d[n] is normalized such that the sum of 5 maxima of d[n] corresponding |
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50 * to each position track does not saturate. |
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51 * |
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52 *************************************************************************/ |
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53 void cor_h_x ( |
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54 Word16 h[], /* (i): impulse response of weighted synthesis filter */ |
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55 Word16 x[], /* (i): target */ |
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56 Word16 dn[], /* (o): correlation between target and h[] */ |
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57 Word16 sf /* (i): scaling factor: 2 for 12.2, 1 for others */ |
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58 ) |
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59 { |
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60 cor_h_x2(h, x, dn, sf, NB_TRACK, STEP); |
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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: cor_h_x2() |
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66 * |
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67 * PURPOSE: Computes correlation between target signal "x[]" and |
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68 * impulse response"h[]". |
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69 * |
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70 * DESCRIPTION: |
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71 * See cor_h_x, d[n] can be normalized regards to sum of the |
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72 * five MR122 maxima or the four MR102 maxima. |
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73 * |
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74 *************************************************************************/ |
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75 void cor_h_x2 ( |
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76 Word16 h[], /* (i): impulse response of weighted synthesis filter */ |
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77 Word16 x[], /* (i): target */ |
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78 Word16 dn[], /* (o): correlation between target and h[] */ |
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79 Word16 sf, /* (i): scaling factor: 2 for 12.2, 1 for others */ |
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80 Word16 nb_track,/* (i): the number of ACB tracks */ |
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81 Word16 step /* (i): step size from one pulse position to the next |
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82 in one track */ |
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83 ) |
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84 { |
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85 Word16 i, j, k; |
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86 Word32 s, y32[L_CODE], max, tot; |
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87 |
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88 /* first keep the result on 32 bits and find absolute maximum */ |
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89 |
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90 tot = 5; move32 (); |
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91 |
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92 for (k = 0; k < nb_track; k++) |
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93 { |
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94 max = 0; move32 (); |
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95 for (i = k; i < L_CODE; i += step) |
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96 { |
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97 s = 0; move32 (); |
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98 for (j = i; j < L_CODE; j++) |
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99 s = L_mac (s, x[j], h[j - i]); |
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100 |
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101 y32[i] = s; move32 (); |
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102 |
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103 s = L_abs (s); |
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104 test (); |
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105 if (L_sub (s, max) > (Word32) 0L) |
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106 max = s; move32 (); |
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107 } |
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108 tot = L_add (tot, L_shr (max, 1)); |
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109 } |
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110 |
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111 j = sub (norm_l (tot), sf); |
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112 |
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113 for (i = 0; i < L_CODE; i++) |
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114 { |
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115 dn[i] = round (L_shl (y32[i], j)); move16 (); |
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116 } |
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117 } |
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118 |
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119 /************************************************************************* |
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120 * |
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121 * FUNCTION: cor_h() |
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122 * |
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123 * PURPOSE: Computes correlations of h[] needed for the codebook search; |
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124 * and includes the sign information into the correlations. |
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125 * |
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126 * DESCRIPTION: The correlations are given by |
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127 * rr[i][j] = sum_{n=i}^{L-1} h[n-i] h[n-j]; i>=j; i,j=0,...,L-1 |
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128 * |
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129 * and the sign information is included by |
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130 * rr[i][j] = rr[i][j]*sign[i]*sign[j] |
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131 * |
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132 *************************************************************************/ |
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133 |
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134 void cor_h ( |
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135 Word16 h[], /* (i) : impulse response of weighted synthesis |
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136 filter */ |
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137 Word16 sign[], /* (i) : sign of d[n] */ |
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138 Word16 rr[][L_CODE] /* (o) : matrix of autocorrelation */ |
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139 ) |
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140 { |
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141 Word16 i, j, k, dec, h2[L_CODE]; |
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142 Word32 s; |
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143 |
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144 /* Scaling for maximum precision */ |
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145 |
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146 s = 2; move32 (); |
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147 for (i = 0; i < L_CODE; i++) |
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148 s = L_mac (s, h[i], h[i]); |
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149 |
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150 j = sub (extract_h (s), 32767); |
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151 test (); |
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152 if (j == 0) |
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153 { |
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154 for (i = 0; i < L_CODE; i++) |
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155 { |
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156 h2[i] = shr (h[i], 1); move16 (); |
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157 } |
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158 } |
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159 else |
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160 { |
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161 s = L_shr (s, 1); |
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162 k = extract_h (L_shl (Inv_sqrt (s), 7)); |
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163 k = mult (k, 32440); /* k = 0.99*k */ |
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164 |
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165 for (i = 0; i < L_CODE; i++) |
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166 { |
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167 h2[i] = round (L_shl (L_mult (h[i], k), 9)); |
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168 move16 (); |
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169 } |
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170 } |
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171 |
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172 /* build matrix rr[] */ |
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173 s = 0; move32 (); |
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174 i = L_CODE - 1; |
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175 for (k = 0; k < L_CODE; k++, i--) |
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176 { |
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177 s = L_mac (s, h2[k], h2[k]); |
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178 rr[i][i] = round (s); move16 (); |
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179 } |
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180 |
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181 for (dec = 1; dec < L_CODE; dec++) |
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182 { |
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183 s = 0; move32 (); |
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184 j = L_CODE - 1; |
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185 i = sub (j, dec); |
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186 for (k = 0; k < (L_CODE - dec); k++, i--, j--) |
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187 { |
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188 s = L_mac (s, h2[k], h2[k + dec]); |
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189 rr[j][i] = mult (round (s), mult (sign[i], sign[j])); |
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190 move16 (); |
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191 rr[i][j] = rr[j][i]; move16 (); |
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192 } |
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193 } |
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194 } |