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Kumar, Anurendra and Guha, Tanaya and Ghosh, Prasanta (2018) A DYNAMIC LATENT VARIABLE MODEL FOR SOURCE SEPARATION. In: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), APR 15-20, 2018, Calgary, CANADA, pp. 2871-2875.

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We propose a novel latent variable model for learning latent bases for time-varying non-negative data. Our model uses a mixture multinomial as the likelihood function and proposes a Dirichlet distribution with dynamic parameters as a prior, which we call the dynamic Dirichlet prior. An expectation maximization (EM) algorithm is developed for estimating the parameters of the proposed model. Furthermore, we connect our proposed dynamic Dirichlet latent variable model (dynamic DLVM) to the two popular latent basis learning methods-probabilistic latent component analysis (PLCA) and non-negative matrix factorization (NMF). We show that (i) PLCA is a special case of the dynamic DLVM, and (ii) dynamic DLVM can be interpreted as a dynamic version of NMF. The effectiveness of the proposed model is demonstrated through extensive experiments on speaker source separation, and speech-noise separation. In both cases, our method performs better than relevant and competitive baselines. For speaker separation, dynamic DLVM shows 1.38 dB improvement in terms of source to interference ratio, and 1 dB improvement in source to artifact ratio.

Item Type: Conference Proceedings
Additional Information: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Calgary, CANADA, APR 15-20, 2018
Keywords: Latent variable model; Dirichlet distribution; non-negative matrix factorization; source separation
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 25 Oct 2018 14:31
Last Modified: 25 Oct 2018 14:31
URI: http://eprints.iisc.ac.in/id/eprint/60957

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