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1 <?xml version="1.0" encoding="UTF-8"?>
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2 <rdf:RDF
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3 xmlns:dc="http://purl.org/dc/elements/1.1/"
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4 xmlns:local="http://sovarr.c4dm.eecs.qmul.ac.uk/features/"
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5 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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6 >
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7 <rdf:Description rdf:about="Mean">
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8 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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9 <dc:description>the mean value of the absolute value of the audio samples amplitude</dc:description>
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10 <local:tag>Audio</local:tag>
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11 </rdf:Description>
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12 <rdf:Description rdf:about="Variance">
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13 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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14 <dc:description>the variance of audio samples amplitude</dc:description>
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15 <local:tag>Audio</local:tag>
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16 </rdf:Description>
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17 <rdf:Description rdf:about="TemporalCentroid">
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18 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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19 <dc:description>time where signal energy is "concentrated"</dc:description>
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20 <local:tag>Audio</local:tag>
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21 </rdf:Description>
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22 <rdf:Description rdf:about="LogAttackTime">
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23 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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24 <dc:description>the base 10 logarithm of the rise time</dc:description>
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25 <local:tag>Audio</local:tag>
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26 </rdf:Description>
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27 <rdf:Description rdf:about="Energy">
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28 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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29 <dc:description>the squared sum of audio samples amplitudes</dc:description>
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30 <local:tag>Audio</local:tag>
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31 </rdf:Description>
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32 <rdf:Description rdf:about="ZeroCrossingRate">
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33 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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34 <dc:description>a measure of the number of time the signal value cross the zero axe, averaged over the whole signal</dc:description>
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35 <local:tag>Audio</local:tag>
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36 </rdf:Description>
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37 <rdf:Description rdf:about="RiseTime">
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38 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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39 <dc:description>the time duration between the signal reached 2% of it maximum value to the time it reaches 80% of its maximum value</dc:description>
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40 <local:tag>Audio</local:tag>
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41 </rdf:Description>
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42 <rdf:Description rdf:about="Decrease">
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43 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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44 <dc:description>a measure of the amount of decrease in the signal energy</dc:description>
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45 <local:tag>Audio</local:tag>
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46 </rdf:Description>
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47 <rdf:Description rdf:about="SpectralMean">
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48 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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49 <dc:description>the spectral power mean value.</dc:description>
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50 <local:tag>Spectral</local:tag>
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51 </rdf:Description>
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52 <rdf:Description rdf:about="GeometricMean">
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53 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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54 <dc:description>the geometric mean for the spectral power values sequence</dc:description>
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55 <local:tag>Spectral</local:tag>
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56 </rdf:Description>
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57 <rdf:Description rdf:about="Energy">
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58 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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59 <dc:description>the squared sum of spectral power distribution values</dc:description>
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60 <local:tag>Spectral</local:tag>
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61 </rdf:Description>
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62 <rdf:Description rdf:about="SpectralCentroid">
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63 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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64 <dc:description>the frequency where the center of mass of the spectral power distribution lies</dc:description>
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65 <local:tag>Spectral</local:tag>
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66 </rdf:Description>
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67 <rdf:Description rdf:about="SpectralFlatness">
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68 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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69 <local:tag>Spectral</local:tag>
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70 </rdf:Description>
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71 <rdf:Description rdf:about="MagnitudeKurtosis">
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72 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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73 <local:tag>Spectral</local:tag>
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74 </rdf:Description>
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75 <rdf:Description rdf:about="MFCC">
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76 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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77 <local:tag>Spectral</local:tag>
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78 </rdf:Description>
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79 <rdf:Description rdf:about="MaxMagFreq">
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80 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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81 <dc:description>frequency of the maximum magnitude of the spectrum</dc:description>
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82 <local:tag>Spectral</local:tag>
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83 </rdf:Description>
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84 <rdf:Description rdf:about="LowFreqEnergyRelation">
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85 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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86 <dc:description>the ratio between the energy over 0-100 Hz band and the whole spectrum energy</dc:description>
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87 <local:tag>Spectral</local:tag>
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88 </rdf:Description>
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89 <rdf:Description rdf:about="SpectralSpread">
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90 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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91 <dc:description>the variation of the spectrum around its mean value.</dc:description>
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92 <local:tag>Spectral</local:tag>
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93 </rdf:Description>
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94 <rdf:Description rdf:about="MagnitudeSkewness">
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95 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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96 <local:tag>Spectral</local:tag>
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97 </rdf:Description>
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98 <rdf:Description rdf:about="Rolloff">
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99 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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100 <dc:description>The spectral roll-off point is the frequency value so that the 85% of the spectral energy is contained below it</dc:description>
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101 <local:tag>Spectral</local:tag>
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102 </rdf:Description>
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103 <rdf:Description rdf:about="SpectralSlope">
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nothing@0
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104 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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105 <dc:description>the amount of decreasing of the spectral magnitude</dc:description>
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106 <local:tag>Spectral</local:tag>
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107 </rdf:Description>
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108 <rdf:Description rdf:about="HighFrequencyContent">
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109 <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
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nothing@0
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110 <dc:description>sum of the squared spectrum magnitude multiplied by the wave number of the bin</dc:description>
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111 <local:tag>Spectral</local:tag>
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112 </rdf:Description>
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113 </rdf:RDF>
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