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Spectro-temporal post-smoothing in NMF based single-channel source separation

Grais, EM and Erdogan, H (2012) Spectro-temporal post-smoothing in NMF based single-channel source separation

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In this paper, we propose a new, simple, fast, and effective method to enforce temporal smoothness on nonnegative matrix factorization (NMF) solutions by post-smoothing the NMF decomposition results. In NMF based single-channel source separation, NMF is used to decompose the magnitude spectra of the mixed signal as a weighted linear combination of the trained basis vectors. The decomposition results are used to build spectral masks. To get temporal smoothness of the estimated sources, we deal with the spectral masks as 2-D images, and we pass the masks through a smoothing filter. The smoothing direction of the filter is the time direction of the spectral masks. The smoothed masks are used to find estimates for the source signals. Experimental results show that, using the smoothed masks give better separation results than enforcing temporal smoothness prior using regularized NMF. © 2012 EURASIP.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions : Surrey research (other units)
Authors : Grais, EM and Erdogan, H
Date : 27 November 2012
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:54
Last Modified : 23 Jan 2020 18:56

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