title   
  

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

Grais, Emad Mounir and Erdoğan, Hakan (2012) Spectro-temporal post-smoothing in NMF based single-channel source separation. In: 20th European Signal Processing Conference (EUSIPCO 2012), Bucharest, Romania

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Abstract

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.

Item Type:Papers in Conference Proceedings
Uncontrolled Keywords:Single channel source separation, nonnegative matrix factorization, and speech-music separation
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
ID Code:19660
Deposited By:Emad Mounir Grais
Deposited On:21 Oct 2012 23:29
Last Modified:01 Mar 2014 22:14

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