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KMID : 0917519990050010023
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Journal of Speech Sciences
1999 Volume.5 No. 1 p.23 ~ p.33
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Ritch Detection Using Wavelet Transform
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Abstract
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Mallat has shown that, with a proper choice of wavelet function, the local maxima of wavelet transformed signal indicate a sharp variation in the signal. Since the glottal closure causes sharp discontinuities in the speech signal, dyadic wavelet transform can be useful for detecting abrupt change in the voiced sounds, i.e., epochs. In this paper, we investigate the glottal closure instants obtained from the waelet analysis of speech signal and compare them with those obtained from the EGG signal. Then, we detect pitch period of speech signal on the basis of these results. experimental results demonstrated that local maxima of wavelet transformed signal give accurate estimation of epoch and pitch period of voiced sound obtained by the proposed algorithm also correspond to those from EGG well.
Keyword : epoch, pitch detection, wavelet transform
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