Local regularity analysis at glottal opening and closure instants in electroglottogram signal using wavelet transform modulus maxima
نویسندگان
چکیده
This paper deals with singularities characterisation and detection in Electroglottogram (EGG) signal using wavelet transform modulus maxima. These singularities correspond to glottal opening and closure instants (GOIs and GCIs), Wavelets with one and two vanishing moments are applied to EGG signal. We show that wavelet with one vanishing moment is sufficient to detect singularities of EGG signal and to measure their regularities. The Lipschitz regularity at any point is the maxima slope of log2 of wavelet transform modulus maxima as a function of log2 s along the maxima lines converging to this point. Local regularity measures allow us to conclude that EGG signal is more regular at glottal opening instant than at glottal closure instant.
منابع مشابه
Robust glottal closure detection using the wavelet transform
In this work, a time-scale framework for analysis of glottal closure instants is proposed. As glottal closure can be soft or sharp, depending on the type of vocal activity, the analysis method should be able to deal with both wide-band and low-pass signals. Thus, a multi-scale analysis seems well-suited. The analysis is based on a dyadic wavelet filterbank. Then, the amplitude maxima of the wav...
متن کاملThe Improvement of the Wavelet Analysis Techniques by Using B-spline Functions Family
The goal of this paper is to justify the use of fractional B-spline bases in several Wavelet Analysis Techniques. We are interested in better controlling the differentiation behavior of the wavelet. For that purpose, we propose an edge detector algorithm by using the wavelet transform local maxima, based on B-spline functions. Another task is to search the connection available between energetic...
متن کاملDetection of glottal opening instants using Hilbert envelope
The objective of this work is to develop an automatic method for estimating glottal opening instants (GOIs) using Hilbert envelope (HE). The GOIs are secondary major excitations after glottal closure instants (GCIs) during the production of voiced speech. The HE is defined as the magnitude of complex time function (CTF) of a given signal. The unipolar property of HE is exploited for picking the...
متن کاملRaising of the Computational Efficiency in Glottal Closure Instant Determination through Wavelet Transform*
The determination of Glottal Closure Instant (GCI) is an important task in voice signal analysis. At GCI the vocal folds close the glottis for the airstream coming from the lungs. By opening and closing the airstream passage the vocal folds generate quasi periodic impulse source for the vocal tract system. GCI determine the instantaneous voice signal pitches. They are used for speaker identific...
متن کاملModelling energy flow in the vocal tract with applications to glottal closure and opening detection
The pitch-synchronous analysis that is used in several areas of speech processing often requires robust detection of the instants of glottal closure and opening. In this paper we derive expressions for the flow of acoustic energy in the lossless-tube model of the vocal tract and show how linear predictive analysis may be used to estimate the waveform of acoustic input power at the glottis. We d...
متن کامل