In the paper by Goto, a multiple estimation method based on a MAP approach to detect melody and bass lines is described. The approach employed in this paper is rather different from other proposals that can be found in the literature. Therefore, the objective in this paper is to robustly determine the notes that sound simultaneously in each of the chords of a piano piece. More precisely, we deal with the multiple fundamental frequency ( ) estimation problem in audio signals composed of piano chords. We are refering to the detection of the notes that sound simultaneously in each of the temporal segments in which the musical piece can be divided. In this paper, we deal with a main stage of automatic music transcription systems.
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