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Tonal Description of Polyphonic Audio for Music Content Processing

Music Technology Group, Institut Universitari de l’Audiovisual, Universitat Pompeu Fabra, Ocata 1, Barcelona, 08003, Spain
emilia.gomez{at}iua.upf.es

We present a method to extract a description of the tonal aspects of music from polyphonic audio signals. We define this tonal description using different levels of abstraction, differentiating between low-level signal descriptors and high-level textual labels. We also establish different temporal scales for description, defining some features as being attached to a certain time instant, and other global descriptors as related to a wider segment. The description is validated by estimating the key of a piece. We also propose the description as a tonal representation of the polyphonic audio signal to measure tonal similarity between audio excerpts and to establish the tonal structure of a musical piece.

Key words: tonal description; key estimation; content analysis and indexing; sound and music computing
History: received February 2004; revised June 2004; accepted November 2004.

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