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Title: Lasso environment model combination for robust speech recognition
Authors: Xiao, Xiong
Li, Jinyu
Chng, Eng Siong
Li, Haizhou
Keywords: DRNTU::Engineering::Computer science and engineering
Issue Date: 2012
Source: Xiao, X., Li, J., Chng, E. S., & Li, H. (2012). Lasso environment model combination for robust speech recognition. 2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 4305-4308.
Abstract: In this paper, we propose a novel acoustic model adaptation method for noise robust speech recognition. Model combination is a common way to adapt acoustic models to a target test environment. For example, the mean supervectors of the adapted model are obtained as a linear combination of mean supervectors of many pre-trained environment-dependent acoustic models. Usually, the combination weights are estimated using a maximum likelihood (ML) criterion and the weights are nonzero for all the mean supervectors. We propose to estimate the weights by using Lasso (least absolute shrinkage and selection operator) which imposes an L1 regularization term in the weight estimation problem to shrink some weights to exactly zero. Our study shows that Lasso usually shrinks to zero the weights of those mean supervectors not relevant to the test environment. By removing some nonrelevant supervectors, the obtained mean supervectors are found to be more robust against noise distortions. Experimental results on Aurora-2 task show that the Lasso-based mean combination consistently outperforms ML-based combination.
DOI: 10.1109/ICASSP.2012.6288871
Rights: © 2012 IEEE.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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