UPM Institutional Repository

Low-distortion MMSE speech enhancement estimator based on laplacian prior


Mahmmod, Basheera M. and Ramli, Abd Rahman and Abdulhussain, Sadiq H. and Syed Mohamed, Syed Abdul Rahman Al-Haddad and A. Jassim, Wissam (2017) Low-distortion MMSE speech enhancement estimator based on laplacian prior. IEEE Access, 5. 9866 - 9881. ISSN 2169-3536


The most well-known conventional speech enhancement algorithms introduce unwanted artifact noise and speech distortion to the enhanced signal. Reducing the effects of such issues require more robust linear and non-linear estimators. This paper proposes new optimum linear and non-linear Laplacian distribution-based estimators. The proposed estimators are derived based on a minimum mean squared error (MMSE) sense to minimize the distortion in different conditions of the underlying speech. Thus, artifact noise is reduced without compromising the noise reduction process. The analytical solutions of the Laplacian distribution-based estimators, linear bilateral Laplacian gain estimator (LBLG), and nonlinear bilateral Laplacian gain estimator (NBLG), are presented. The proposed estimators are implemented in three steps. First, the observation signal is decorrelated through a real transform domain to obtain its transform coefficients. Second, the proposed estimators are applied to estimate the clean speech signal from the noisy signal in the decorrelated domain. Finally, the inverse of the real transform is applied to obtain the original speech signal in the time domain. Two conditions in these estimators account for interference events between the speech signal and noise coefficients in the decorrelated domain. Moreover, a mathematical aspect of mean square error of LBLG is evaluated, which presents a significant improvement over other methods. Furthermore, a comprehensive description of the whole variations of the LBLG and NBLG gains characteristics is presented. A comparative evaluation is performed with effective quality metrics, segmental signal-to-noise ratio and perceptual evaluation of speech quality, to demonstrate the advantage and effectiveness of the proposed estimators. The performance of the proposed estimators outperformed other methods, which are the traditional MMSE approach, perceptually motivated Bayesian estimator, dual gain Wiener estimator, and dual MMSE estimator in terms of different objective measurements.

Download File

[img] Text
Low-distortion MMSE speech enhancement estimator based on laplacian prior.pdf
Restricted to Repository staff only

Download (4MB)
Official URL or Download Paper: https://ieeexplore.ieee.org/document/7914629

Additional Metadata

Item Type: Article
Divisions: Faculty of Computer Science and Information Technology
Publisher: Institute of Electrical and Electronics Engineers
Keywords: Speech enhancement; Laplacian distribution; Minimum mean square error estimator; Speech model; Noise model
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 31 Oct 2019 04:19
Last Modified: 31 Oct 2019 04:19
URI: http://psasir.upm.edu.my/id/eprint/62322
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item