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2 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
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3 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
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4 @prefix dc: <http://purl.org/dc/elements/1.1/> .
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5 @prefix mo: <http://purl.org/ontology/mo/> .
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6 @prefix af: <http://purl.org/ontology/af/> .
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7 @prefix event: <http://purl.org/NET/c4dm/event.owl#> .
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8 @prefix tl: <http://purl.org/NET/c4dm/timeline.owl#> .
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9 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
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10 @prefix : <#> .
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11
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12
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13 # Describe the signal we're annotating, and associate it with a
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14 # timeline (the timeline is named as :base_timeline but never given
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15 # any attributes in this document). Any feature that is associated
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16 # with the same timeline will be taken as derived from this signal.
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17
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18 :audio_signal a mo:Signal ;
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19 mo:available_as <file:///path/to/myfile.wav> ;
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20 mo:time :signal_interval .
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21
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22 :signal_interval a tl:Interval ;
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23 tl:onTimeLine :base_timeline ;
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24 tl:beginsAt "PT0"^^xsd:duration .
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25
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26
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27 # A sparse feature event.
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28
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29 :event0 a af:Onset ;
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30 event:time :time0 .
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31
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32 :time0 a tl:Instant ;
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33 tl:onTimeLine :base_timeline ;
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34 tl:at "PT0.185759637S"^^xsd:duration .
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35
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36 # Alternatively we could write that with a blank node.
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37
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38 :event1 a af:Onset ;
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39 event:time [
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40 a tl:Instant ;
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41 tl:onTimeLine :base_timeline ;
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42 tl:at "PT0.510839002S"^^xsd:duration ;
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43 ] .
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44
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45
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46 # For a dense feature, we need an appropriately sampled, windowed timeline.
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47
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48 :feature_timeline a tl:DiscreteTimeLine .
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49
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50 :feature_timeline_map a tl:UniformSamplingWindowingMap ;
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51 tl:rangeTimeLine :feature_timeline ;
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52 tl:domainTimeLine :base_timeline ;
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53 tl:sampleRate "44100"^^xsd:int ;
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54 tl:windowLength "1024"^^xsd:int ;
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55 tl:hopSize "512"^^xsd:int .
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56
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57
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58 # ... and an interval, defined in terms of hops (the discrete steps of
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59 # the windowed timeline).
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60
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61 :feature_interval a tl:Interval ;
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62 tl:onTimeLine :feature_timeline ;
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63 tl:beginsAt "0"^^xsd:int ;
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64 tl:duration "5634"^^xsd:int .
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65
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66
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67 # Then our feature is a signal that is on the interval we just
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68 # described. We associate it explicitly with the original audio
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69 # signal, although presumably we could leave the association implicit,
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70 # to be derived from the relationships between timelines, just as it
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71 # is for the sparse features above.
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72
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73 :audio_signal af:signal_feature :feature1 .
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74
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75 :feature_signal_type rdfs:subClassOf af:DetectionFunction ;
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76 dc:title "Detection Function from Simple Percussion Onset Detector" .
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77
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78 :feature1 a :feature_signal_type ;
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79 mo:time :feature_interval ;
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80 af:dimensions "12 12345" ;
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81 af:value "0 0 0 0 0 0 0 1 2 3 1 24 236 123213 (etc)" .
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82
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