Chris@0: 
Chris@0: @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
Chris@0: @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
Chris@0: @prefix dc: <http://purl.org/dc/elements/1.1/> .
Chris@0: @prefix mo: <http://purl.org/ontology/mo/> .
Chris@0: @prefix af: <http://purl.org/ontology/af/> .
Chris@0: @prefix event: <http://purl.org/NET/c4dm/event.owl#> .
Chris@0: @prefix tl: <http://purl.org/NET/c4dm/timeline.owl#> .
Chris@0: @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
Chris@0: @prefix : <#> .
Chris@0: 
Chris@0: 
Chris@0: # Describe the signal we're annotating, and associate it with a
Chris@0: # timeline (the timeline is named as :base_timeline but never given
Chris@0: # any attributes in this document).  Any feature that is associated
Chris@0: # with the same timeline will be taken as derived from this signal.
Chris@0: 
Chris@0: :audio_signal a mo:Signal ;
Chris@0:         mo:available_as <file:///path/to/myfile.wav> ;
Chris@0:         mo:time :signal_interval .
Chris@0: 
Chris@0: :signal_interval a tl:Interval ;
Chris@0:                  tl:onTimeLine :base_timeline ;
Chris@0:                  tl:beginsAt "PT0"^^xsd:duration .
Chris@0: 
Chris@0: 
Chris@0: # A sparse feature event.
Chris@0: 
Chris@0: :event0 a af:Onset ;
Chris@0:         event:time :time0 .
Chris@0: 
Chris@0: :time0 a tl:Instant ;
Chris@0:        tl:onTimeLine :base_timeline ;
Chris@0:        tl:at "PT0.185759637S"^^xsd:duration .
Chris@0: 
Chris@0: # Alternatively we could write that with a blank node.
Chris@0: 
Chris@0: :event1 a af:Onset ;
Chris@0:         event:time [
Chris@0:                    a tl:Instant ;
Chris@0:                    tl:onTimeLine :base_timeline ;
Chris@0:                    tl:at "PT0.510839002S"^^xsd:duration ;
Chris@0:                    ] .
Chris@0: 
Chris@0: 
Chris@0: # For a dense feature, we need an appropriately sampled, windowed timeline.
Chris@0: 
Chris@0: :feature_timeline a tl:DiscreteTimeLine .
Chris@0: 
Chris@0: :feature_timeline_map a tl:UniformSamplingWindowingMap ;
Chris@0:                tl:rangeTimeLine :feature_timeline ;
Chris@0:                tl:domainTimeLine :base_timeline ;
Chris@0:                tl:sampleRate "44100"^^xsd:int ;
Chris@0:                tl:windowLength "1024"^^xsd:int ;
Chris@0:                tl:hopSize "512"^^xsd:int .
Chris@0: 
Chris@0: 
Chris@0: # ... and an interval, defined in terms of hops (the discrete steps of
Chris@0: # the windowed timeline).
Chris@0: 
Chris@0: :feature_interval a tl:Interval ;
Chris@0:                   tl:onTimeLine :feature_timeline ;
Chris@0:                   tl:beginsAt "0"^^xsd:int ;
Chris@0:                   tl:duration "5634"^^xsd:int .
Chris@0: 
Chris@0: 
Chris@0: # Then our feature is a signal that is on the interval we just
Chris@0: # described.  We associate it explicitly with the original audio
Chris@0: # signal, although presumably we could leave the association implicit,
Chris@0: # to be derived from the relationships between timelines, just as it
Chris@0: # is for the sparse features above.
Chris@0: 
Chris@0: :audio_signal af:signal_feature :feature1 .
Chris@0: 
Chris@0: :feature_signal_type rdfs:subClassOf af:DetectionFunction ;
Chris@0:           dc:title "Detection Function from Simple Percussion Onset Detector" .
Chris@0: 
Chris@0: :feature1 a :feature_signal_type ;
Chris@0:           mo:time :feature_interval ;
Chris@0:           af:dimensions "12 12345" ;
Chris@0:           af:value "0 0 0 0 0 0 0 1 2 3 1 24 236 123213 (etc)" .
Chris@0: