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Wavelet cesptral coefficients for isolated speech recognition

Adam, Tarmizi and Salam, Md Sah and Gunawan, Teddy Surya (2013) Wavelet cesptral coefficients for isolated speech recognition. TELKOMNIKA Indonesian Journal of Electrical Engineering, 11 (5). pp. 2731-2738. ISSN 2302-4046

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Abstract

The study proposes an improved feature extraction method that is called Wavelet Cepstral Coefficients (WCC). In traditional cepstral analysis, the cepstrums are calculated with the use of the Discrete Fourier Transform (DFT). Owing to the fact that the DFT calculation assumes signal stationary between frames which in practice is not quite true, the WCC replaces the DFT block in the traditional cepstrum calculation with the Discrete Wavelet Transform (DWT) hence producing the WCC. To evaluate the proposed WCC, speech recognition task of recognizing the 26 English alphabets were conducted. Comparisons with the traditional Mel-Frequency Cepstral Coefficients (MFCC) are done to further analyze the effectiveness of the WCCs. It is found that the WCCs showed some comparable results when compared to the MFCCs considering the WCCs small vector dimension when compared to the MFCCs. The best recognition was found from WCCs at level 5 of the DWT decomposition with a small difference of 1.19% and 3.21% when compared to the MFCCs for speaker independent and speaker dependent tasks respectively.

Item Type: Article (Journal)
Additional Information: 5588/32110
Uncontrolled Keywords: Cepstral analysis; Feature extraction; Speech processing; Speech recognition; Wavelet transform
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User: Dr Teddy Surya Gunawan
Date Deposited: 02 Oct 2013 11:47
Last Modified: 02 Oct 2013 11:47
URI: http://irep.iium.edu.my/id/eprint/32110

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