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Folie 1

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What is the essence of a melody? Tempo But can vary in different interpretations. Dynamics As the tempo not necessarily linked to the melody ... – PowerPoint PPT presentation

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Title: Folie 1


1
Music Information Retrieval
Classification Of Monophonic Midi-Tunes By
Looking At Their Interval Distribution (COMMID)
Eugen Staab
2
Introduction
Music Information Retrieval for
Midi
Transformation possible
Audio
3
Motivation
  • What is the essence of a text?
  • As we have seen for text retrieval By some
    techniques the sequence of terms is ignored but
    they get good results.
  • What is the essence of a melody?
  • Tempo But can vary in different interpretations
  • Dynamics As the tempo not necessarily linked to
    the melody
  • Rhythm Determined by the length of the notes
  • Tonality Important, but how to represent
    it? Intervals are independent of transposition

4
Feature Vectors For Midi-Tunes
  • Main Question
  • How to represent a monophonic ( for one voice)
    Midi-Tune appropriately, i.e. how to transform it
    into a feature Vector?
  • Idea 1 Take the distribution of the
    intervals 25 values for one vector
  • 12 intervals up
  • 12 intervals down
  • The prim interval (identity)
  • Idea 2 Take the distribution of the
    interval-transitions
  • 25² 625 entries in one vector (All
    combinations of two intervals from above)

5
Idea 1 Simple Intervals
  • Tests on 2 Collections
  • ca. 8000 finnish folk songs,
  • ca. 2000 tunes of western music
  • Using NMF to create classification vectors
  • Problem with intervals Prim(1) is dominanting
    other intervals Treat it as stopword? Doesnt
    help The same problem arises then again
    for the next most frequent intervals.
  • Reason Every tune has a similar distribution of
    simple intervals
  • Does it change if we look at two consecutive
    intervals?

6
Idea 2 Interval Transitions
Same phenomenon Transitions involving the Prim
are dominating the other transitions
7
Idea 1 Advancements
New idea Look at the intervals between the notes
of the melodie and its last note
Results
? Looks promising But No recognisable
structures in classifications for second
collection
8
Conclusion
Looking at the distribution of the intervals of a
melody seemingly doesnt tell us enough about it
to classify it reasonably
? Maybe a longer sequence of the intervals and/or
the rhythm have to be taken into account as well
9
End of presentation.Thanks for your attention!
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