Constrained and regularized variants of non-negative matrix factorization incorporating music-specific constraints. - Hirokazu Kameoka; Masahiro Nakano; Kazuki Ochiai; Yutaka Imoto; Kunio Kashino; Shigeki Sagayama (ICASSP, 2012)

Explicit beat structure modeling for non-negative matrix factorization-based multipitch analysis. - Kazuki Ochiai; Hirokazu Kameoka; Shigeki Sagayama (ICASSP, 2012)

Context-free 2D Tree Structure Model of Musical Notes for Bayesian Modeling of Polyphonic Spectrograms. - Hirokazu Kameoka; Kazuki Ochiai; Masahiro Nakano; Masato Tsuchiya; Shigeki Sagayama (ISMIR, 2012)

Probabilistic model of two-dimensional rhythm tree structure representation for automatic transcription of polyphonic MIDI signals. - Masato Tsuchiya; Kazuki Ochiai; Hirokazu Kameoka; Shigeki Sagayama (APSIPA, 2013)