NDLI: Comparison between soft and hard Thresholding on selected intrinsic mode selection

Content Provider	IEEE Xplore Digital Library
Author	Issaoui, H. Bouzid, A. Ellouze, N.
Copyright Year	2012
Description	Author affiliation: LSTS, ENIT, Tunis Le Belvdre B.P. 37, Tunis, Tunisie, 1002 (Issaoui, H.; Bouzid, A.; Ellouze, N.)
Abstract	This paper uses an improved speech enhancement approach based on Empirical Mode Decomposition (EMD), Mode Selection approach and Thresholding technique through hard and soft functions. At first, by using a time decomposition called sifting process, the noisy speech signal is decomposed adaptively into intrinsic oscillatory components called Intrinsic Mode Functions (IMFs). Basically, the Modes Selection idea implies that the lower order IMFs (high-frequency modes) is mostly dominated by noise and the last ones (low-frequency modes) represent the most structures of the signal. Therefore, the denoised signal is partially reconstructed only by the low-frequency modes. Secluding the first IMFs may introduce a signal distortion rather than reducing noise. Our upgraded approach consists of thresholding the lower order modes using the soft or hard thresholding algorithm and that are added to the rest of IMFs. The simulations results show that the denoising with the hard function is more effective in removing the noise components then the soft one.
Starting Page	712
Ending Page	715
File Size	224783
Page Count	4
File Format	PDF
ISBN	9781467316576
e-ISBN	9781467316583
DOI	10.1109/SETIT.2012.6482001
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-03-21
Publisher Place	Tunisia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Empirical mode decomposition Noise reduction Speech enhancement Speech Signal to noise ratio
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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