Use of speech presence uncertainty with MMSE spectral energy estimation for robust automatic speech recognition

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Title Use of speech presence uncertainty with MMSE spectral energy estimation for robust automatic speech recognition
Author Stark, Anthony Phillip; Paliwal, Kuldip Kumar
Journal Name Speech Communication
Year Published 2011
Place of publication Netherlands
Publisher Elsevier
Abstract In this paper, we investigate the use of the minimum mean square error (MMSE) spectral energy estimator for use in environmentrobust automatic speech recognition (ASR). In the past, it has been common to use the MMSE log-spectral amplitude estimator for this task. However, this estimator was originally derived under subjective human listening criteria. Therefore its complex suppression rule may not be optimal for use in ASR. On the other hand, it can be shown that the MMSE spectral energy estimator is closely related to the MMSE Mel-frequency cepstral coefficient (MFCC) estimator. Despite this, the spectral energy estimator has tended to suffer from the problem of excessive residual noise. We examine the cause of this residual noise and show that the introduction of a heuristic based speech presence uncertainty (SPU) can significantly improve its performance as a front-end ASR enhancement regime. The proposed spectral energy SPU estimator is evaluated on the Aurora2, RM and OLLO2 speech recognition tasks and can be shown to significantly improve additive noise robustness over the more common spectral amplitude and log-spectral amplitude estimators.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.specom.2010.08.001
Volume 53
Page from 51
Page to 61
ISSN 0167-6393
Date Accessioned 2011-11-07; 2012-02-14T05:33:49Z
Date Available 2012-02-14T05:33:49Z
Research Centre Institute for Integrated and Intelligent Systems
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Signal Processing
URI http://hdl.handle.net/10072/42592
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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