Example translated from MIREX 2005

From Music Ontology Wiki

This example translates in RDF a small part of the MIREX 2005 database. This describes parts of an audio file with singing voice, and the corresponding fundamental frequencies for frames within it.

Hightlighted source

@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix event: <http://purl.org/NET/c4dm/event.owl#>.
@prefix tl: <http://purl.org/NET/c4dm/timeline.owl#>.
@prefix mo: <http://purl.org/ontology/mo/>.
@prefix db: <http://ismir.net/2004/db/>. # Fix that?
@prefix : <#>.


# Linking our annotations to the audio file

db:opera_male5 
	a mo:AudioFile;
	mo:encodes :sig.

:sig 
	a mo:Signal;
	mo:time [tl:timeline :tl]. # :tl is the anchor timeline for our annotations

# Defining our "classifiers"

:SingEvent
	a owl:Class;
	rdfs:subClassOf event:Event;
	rdfs:label "Classify regions as holding some singing voice";
	.

:FreqEvent
	a owl:Class;
	rdfs:subClassOf event:Event;
	rdfs:label "Attach a frequency of the singing voice to a region";
	.

:freq 
	rdfs:subPropertyOf event:literal_factor;
	rdfs:label "Actual value of the frequency";
	rdfs:domain :FreqEvent;
	.

# And annotate... We define events on the timeline :tl

:e1
	a :SingEvent;
	event:time [tl:start "PT0.017S"; tl:end "PT3.291S"; tl:timeline :tl]
	.

:f1
	a :FreqEvent;
	event:time [tl:at "PT0.017S"];
	:freq "192.662";
	.

:f2 
	a :FreqEvent;
	event:time [tl:at "PT0.023S"];
	:freq "183.918";
	.

:f3
	a :FreqEvent;
	event:time [tl:at "PT0.029S"];
	:freq "173.222";
	.