Detecting harmonic change in musical audio

Authors:
Christopher Harte;Mark Sandler;Martin Gasser
Affiliations:
University of London, London, UK;University of London, London, UK;Austrian Research Institute for Artificial Intelligence, Vienna, Austria
Venue:
Proceedings of the 1st ACM workshop on Audio and music computing multimedia
Year:
2006

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Abstract

We propose a novel method for detecting changes in the harmonic content of musical audio signals. Our method uses a new model for Equal Tempered Pitch Class Space. This model maps 12-bin chroma vectors to the interior space of a 6-D polytope; pitch classes are mapped onto the vertices of this polytope. Close harmonic relations such as fifths and thirds appear as small Euclidian distances. We calculate the Euclidian distance between analysis frames n +1 and n -1 to develop a harmonic change measure for frame n. A peak in the detection function denotes a transition from one harmonically stable region to another. Initial experiments show that the algorithm can successfully detect harmonic changes such as chord boundaries in polyphonic audio recordings.