A New Method for Low SNR Estimation of Noisy Speech Signals Using Fourth-Order Moments

Roghayeh DOOST  Abolghasem SAYADIAN  Hossein SHAMSI  

IEICE TRANSACTIONS on Information and Systems   Vol.E93-D   No.6   pp.1599-1607
Publication Date: 2010/06/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E93.D.1599
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Speech and Hearing
SNR estimation,  higher-order moments,  moment estimation,  speech processing,  

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In this paper the SNR estimation is performed frame by frame, during the speech activity. For this purpose, the fourth-order moments of the real and imaginary parts of frequency components are extracted, for both the speech and noise, separately. For each noisy frame, the mentioned fourth-order moments are also estimated. Making use of the proposed formulas, the signal-to-noise ratio is estimated in each frequency index of the noisy frame. These formulas also predict the overall signal-to-noise ratio in each noisy frame. What makes our method outstanding compared to conventional approaches is that this method takes into consideration both the speech and noise identically. It estimates the negative SNR almost as well as the positive SNR.