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In this paper, we discuss new efficient algorithms for nonnegative matrix factorization (NMF) with smoothness constraints imposed on nonnegative components or factors. Such constraints allow us to alleviate certain ambiguity problems, which facilitates better physical interpretation or meaning. In our approach, various basis functions are exploited to flexibly and efficiently represent the smooth...
In this paper, we address the tasks of audio source counting and separation for a stereo anechoic mixture of audio signals. This will be achieved in two stages. In the first stage, a novel approach is introduced for estimating the number of sources as well as the channel mixing coefficients. For this purpose, a 2-D spectrum is evaluated against both the phase and amplitude differences of the two channels...
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