Instrogram: Probabilistic Representation of Instrument Existence for Polyphonic Music

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概要

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• This paper presents a new technique for recognizing musical instruments in polyphonic music. Since conventional musical instrument recognition in polyphonic music is performed notewise, i.e., for each note, accurate estimation of the onset time and fundamental frequency (F0) of each note is required. However, these estimations are generally not easy in polyphonic music, and thus estimation errors severely deteriorated the recognition performance. Without these estimations, our technique calculates the temporal trajectory of instrument existence probabilities for every possible F0. The instrument existence probability is defined as the product of a nonspecific instrument existence probabilitycalculated using the PreFEst and a conditional instrument existence probability calculated using hidden Markov models. The instrument existence probability is visualized as a spectrogram-like graphical representation called the instrogram and is applied to MPEG-7 annotation and instrumentation-similarity-based music information retrieval. Experimental results from both synthesized music and real performance recordings have shown that instrograms achieved MPEG-7 annotation (instrument identification) with a precision rate of 87.5% for synthesized music and 69.4% for real performances on average and that the instrumentation similarity measure reflected the actual instrumentation better than an MFCC-based measure.

• Information and Media Technologies 編集運営会議の論文

著者

• KOMATANI Kazunori

  Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University

• Kitahara Tetsuro

  Department Of Intelligence Science And Technology Graduate School Of Informatics Kyoto University

• Goto Masataka

  National Institute Of Advanced Industrial Science And Technology

• Okuno Hiroshi

  Department Of Applied Materials Science Faculty Of Engineering Osaka Prefecture University

• OKUNO Hiroshi

  Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University

• OGATA Tetsuya

  Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University

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