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This paper presents a statistical method of multichannel source separation, called NMF-LDA, that unifies nonnegative matrix factorization (NMF) and latent Dirichlet allocation (LDA) in a hierarchical Bayesian manner. If the frequency components of sources are sparsely distributed, the source spectrograms can be considered to be disjoint with each other in most time-frequency bins. Under this assumption,...
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