Precision Improvement of Time-frequency Analysis and Application to Development of Audio-MIDI Conversion Tool

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  • 時間周波数解析法の精度改善とオーディオ-MIDI変換ツール開発への応用
  • ジカン シュウハスウ カイセキホウ ノ セイド カイゼン ト オーディオ-MIDI ヘンカン ツール カイハツ エ ノ オウヨウ

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Abstract

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Realization of Audio-MIDI conversion tools are requested for creation of playback-control data such as for MIDI-Karaoke machines, and for development of an automatic music notation system. Realistic playback with MIDI velocity or pitch-bend parameters recognized are required in the former application, whereas reconstruction of the original music score by removing fluctuations of tempo or pitch is required in the latter application. In both applications, precisions of converted MIDI data from audio signals and time-frequency analysis play an important role. A set of musical information is expressed as frequency components and temporal transitions of sounds. However, it is difficult to analyze precisely both frequency components and temporal transitions at the same time, owing to the known uncertainty principle, which makes difficult to develop a practical audio-MIDI conversion tool. In this paper, we propose an improved generalized harmonic analysis method, which can increase both frequency and temporal resolution in a time-frequency analysis. And we report to apply our improved analysis method, to our developing audio-MIDI conversion tool.

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