NDLI: Detection of vowel onset and offset points using non-local similarity between DWT approximation coefficients

Content Provider	IET Digital Library
Author	Kumar, A. Pradhan, G.
Abstract	In a given speech signal, transition at the vowel offset points (VEPs) is quite different when compared to the vowel onset points (VOPs). Consequently, most of the features reported for the detection of VOPs fail to detect VEPs. To address this issue, a front-end speech parametrisation approach is proposed for simultaneously detecting VOPs and VEPs. In the proposed approach, first energy due to the high-frequency unvoiced sound units is suppressed by using discrete wavelet transform (DWT). Then, weight values (WVs) are assigned to each of the sample points by computing similarity between the analysis frames within a search neighbourhood using non-local means (NLM) estimation. The WVs computed from the NLM are significantly less when the frames under consideration are similar in comparison to the dissimilar ones. Since vowels are longer regions and exhibit periodicity, there will be more similarity in the case of frames belonging to these regions. In this work, this aspect of the WVs is used as a feature for detecting VOPs and VEPs. The proposed feature is observed to outperform the earlier reported features for the task of detecting VOPs as well as VEPs. The improvement observed in the detection accuracy of VEPs is significant.
Starting Page	722
Ending Page	724
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 11, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2018.0629
Journal	Electronics Letters
Publisher Date	2018-04-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analysis Frames Detection Accuracy Discrete Wavelet Transform DWT Approximation Coefficient Front-end Speech Parametrisation Approach Integral Transforms NLM Nonlocal Means Estimation Nonlocal Similarity Search Neighbourhood Speech And Audio Signal Processing Speech Processing Speech Processing Technique Speech Signal VEPs VOPs Vowel Offset Point Vowel Onset Point Weight Value WVs
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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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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