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Acoustics Research Institute of the Austrian Academy of Sciences, Liebiggasse 5, A-1010 Vienna Phone: 043-1-4277-29500 Fax: 043-1-4277-9296 Email: wad@kfs.oeaw.ac.at http//www.kfs.oeaw.ac.at

Structuring of audio by visualisation (narrow band spectrogram) of an extract (11 min) from Bruckner 8th symphony.

Visualisation of audio signals by so-called Spectrograms is employed whenever music signals cannot be represented in 'textual' formats as music score or transcription. This happens frequently in ethnomusicology or when acoustic and perceptual differences between individual interpretations of the same piece have to be documented. Visualisation of music is performed in real time so that visual and audio representation of the music can be observed synchronously. Spectrograms can be read similar to piano rolls comprising the running time axis on the abscissa and the frequency scale on the ordinate. The strength (level) of spectral components is coded in an appropriate color scale. Spectrogram icons (sound thumbnails) are used in order to provide fast access to a large number of sound files and segments stored in a database.

Visualisation of Music Signals: Segmentation semi-automatically

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