1 | /* |
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2 | Copyright (C) 2003-2015 Paul Brossier <piem@aubio.org> |
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3 | |
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4 | This file is part of aubio. |
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5 | |
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6 | aubio is free software: you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation, either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |
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11 | aubio is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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18 | |
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19 | */ |
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20 | |
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21 | #ifndef AUBIO_CVEC_H |
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22 | #define AUBIO_CVEC_H |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif |
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27 | |
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28 | /** \file |
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29 | |
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30 | Vector of complex-valued data, stored in polar coordinates |
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31 | |
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32 | This file specifies the ::cvec_t buffer type, which is used throughout aubio |
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33 | to store complex data. Complex values are stored in terms of ::cvec_t.phas |
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34 | and norm, within 2 vectors of ::smpl_t of size (size/2+1) each. |
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35 | |
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36 | \example test-cvec.c |
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37 | |
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38 | */ |
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39 | |
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40 | /** Vector of real-valued phase and spectrum data |
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41 | |
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42 | \code |
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43 | |
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44 | uint_t buffer_size = 1024; |
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45 | |
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46 | // create a complex vector of 512 values |
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47 | cvec_t * input = new_cvec (buffer_size); |
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48 | |
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49 | // set some values of the vector |
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50 | input->norm[23] = 2.; |
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51 | input->phas[23] = M_PI; |
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52 | // .. |
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53 | |
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54 | // compute the mean of the vector |
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55 | mean = cvec_mean(input); |
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56 | |
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57 | // destroy the vector |
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58 | del_cvec (input); |
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59 | |
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60 | \endcode |
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61 | |
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62 | */ |
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63 | typedef struct { |
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64 | uint_t length; /**< length of buffer = (requested length)/2 + 1 */ |
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65 | smpl_t *norm; /**< norm array of size ::cvec_t.length */ |
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66 | smpl_t *phas; /**< phase array of size ::cvec_t.length */ |
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67 | } cvec_t; |
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68 | |
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69 | /** cvec_t buffer creation function |
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70 | |
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71 | This function creates a cvec_t structure holding two arrays of size |
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72 | [length/2+1], corresponding to the norm and phase values of the |
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73 | spectral frame. The length stored in the structure is the actual size of both |
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74 | arrays, not the length of the complex and symmetrical vector, specified as |
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75 | creation argument. |
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76 | |
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77 | \param length the length of the buffer to create |
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78 | |
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79 | */ |
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80 | cvec_t * new_cvec(uint_t length); |
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81 | |
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82 | /** cvec_t buffer deletion function |
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83 | |
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84 | \param s buffer to delete as returned by new_cvec() |
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85 | |
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86 | */ |
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87 | void del_cvec(cvec_t *s); |
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88 | |
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89 | /** write norm value in a complex buffer |
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90 | |
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91 | This is equivalent to: |
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92 | \code |
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93 | s->norm[position] = val; |
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94 | \endcode |
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95 | |
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96 | \param s vector to write to |
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97 | \param val norm value to write in s->norm[position] |
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98 | \param position sample position to write to |
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99 | |
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100 | */ |
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101 | void cvec_norm_set_sample (cvec_t *s, smpl_t val, uint_t position); |
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102 | |
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103 | /** write phase value in a complex buffer |
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104 | |
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105 | This is equivalent to: |
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106 | \code |
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107 | s->phas[position] = val; |
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108 | \endcode |
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109 | |
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110 | \param s vector to write to |
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111 | \param val phase value to write in s->phas[position] |
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112 | \param position sample position to write to |
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113 | |
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114 | */ |
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115 | void cvec_phas_set_sample (cvec_t *s, smpl_t val, uint_t position); |
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116 | |
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117 | /** read norm value from a complex buffer |
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118 | |
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119 | This is equivalent to: |
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120 | \code |
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121 | smpl_t foo = s->norm[position]; |
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122 | \endcode |
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123 | |
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124 | \param s vector to read from |
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125 | \param position sample position to read from |
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126 | |
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127 | */ |
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128 | smpl_t cvec_norm_get_sample (cvec_t *s, uint_t position); |
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129 | |
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130 | /** read phase value from a complex buffer |
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131 | |
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132 | This is equivalent to: |
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133 | \code |
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134 | smpl_t foo = s->phas[position]; |
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135 | \endcode |
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136 | |
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137 | \param s vector to read from |
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138 | \param position sample position to read from |
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139 | \returns the value of the sample at position |
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140 | |
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141 | */ |
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142 | smpl_t cvec_phas_get_sample (cvec_t *s, uint_t position); |
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143 | |
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144 | /** read norm data from a complex buffer |
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145 | |
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146 | \code |
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147 | smpl_t *data = s->norm; |
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148 | \endcode |
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149 | |
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150 | \param s vector to read from |
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151 | |
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152 | */ |
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153 | smpl_t * cvec_norm_get_data (const cvec_t *s); |
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154 | |
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155 | /** read phase data from a complex buffer |
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156 | |
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157 | This is equivalent to: |
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158 | \code |
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159 | smpl_t *data = s->phas; |
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160 | \endcode |
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161 | |
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162 | \param s vector to read from |
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163 | |
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164 | */ |
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165 | smpl_t * cvec_phas_get_data (const cvec_t *s); |
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166 | |
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167 | /** print out cvec data |
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168 | |
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169 | \param s vector to print out |
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170 | |
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171 | */ |
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172 | void cvec_print(const cvec_t *s); |
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173 | |
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174 | /** make a copy of a vector |
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175 | |
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176 | \param s source vector |
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177 | \param t vector to copy to |
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178 | |
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179 | */ |
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180 | void cvec_copy(const cvec_t *s, cvec_t *t); |
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181 | |
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182 | /** set all norm elements to a given value |
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183 | |
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184 | \param s vector to modify |
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185 | \param val value to set elements to |
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186 | |
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187 | */ |
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188 | void cvec_norm_set_all (cvec_t *s, smpl_t val); |
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189 | |
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190 | /** set all norm elements to zero |
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191 | |
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192 | \param s vector to modify |
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193 | |
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194 | */ |
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195 | void cvec_norm_zeros(cvec_t *s); |
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196 | |
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197 | /** set all norm elements to one |
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198 | |
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199 | \param s vector to modify |
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200 | |
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201 | */ |
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202 | void cvec_norm_ones(cvec_t *s); |
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203 | |
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204 | /** set all phase elements to a given value |
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205 | |
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206 | \param s vector to modify |
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207 | \param val value to set elements to |
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208 | |
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209 | */ |
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210 | void cvec_phas_set_all (cvec_t *s, smpl_t val); |
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211 | |
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212 | /** set all phase elements to zero |
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213 | |
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214 | \param s vector to modify |
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215 | |
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216 | */ |
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217 | void cvec_phas_zeros(cvec_t *s); |
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218 | |
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219 | /** set all phase elements to one |
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220 | |
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221 | \param s vector to modify |
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222 | |
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223 | */ |
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224 | void cvec_phas_ones(cvec_t *s); |
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225 | |
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226 | /** set all norm and phas elements to zero |
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227 | |
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228 | \param s vector to modify |
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229 | |
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230 | */ |
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231 | void cvec_zeros(cvec_t *s); |
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232 | |
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233 | /** take logarithmic magnitude |
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234 | |
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235 | \param s input cvec to compress |
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236 | \param lambda value to use for normalisation |
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237 | |
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238 | \f$ S_k = log( \lambda * S_k + 1 ) \f$ |
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239 | |
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240 | */ |
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241 | void cvec_logmag(cvec_t *s, smpl_t lambda); |
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242 | |
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243 | #ifdef __cplusplus |
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244 | } |
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245 | #endif |
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246 | |
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247 | #endif /* AUBIO_CVEC_H */ |
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