Beat Induction and Rhythm Recognition
نویسنده
چکیده
Most people have no diiculty in picking out the beat in a piece of music, and even if they cannot deene what it is they have detected, they can tap their feet in time with the music. This ability is called beat induction. A more diicult task, which we call rhythm recognition, involves uncovering the hierarchical structure of the timing relationships in the music, at a higher level than the frequencies of vibration of individual notes and chords, but at a lower level than the musical form and phrase structure. In this paper, we present a bottom-up approach to the recognition and transcription of musical rhythms from acoustic signals. We assume no a priori high-level knowledge of the music such as the time signature or tempo, but attempt to derive this information from the timing patterns of detected note onsets. The problem of rhythm recognition is divided into three stages: rstly, nding the main beat or rhythmic pulse of the music; secondly, discovering the rhythmic structure, a hierarchical arrangement of units consisting of multiples and submultiples of beats; and thirdly, mapping the note onsets to musical timings and durations. We compare our methods with other work presented in the literature and with commercial products which purport to solve the same problems. This work forms part of an automatic music transcription system currently under development by the author.
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