Multipitch estimation and instrument recognition by exemplar-based sparse representation. - Ikuo Degawa; Kei Sato; Masaaki Ikehara (ACSSC, 2013)

NMF-based multiple pitch estimation using sparseness and inter-frame continuity constraints. - Takanori Fujisawa; Ikuo Degawa; Masaaki Ikehara (MMSP, 2014)