Detection of glottal closure instant and glottal open region from speech signals using spectral flatness measure

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
30-43
Series
Speech Communication, Volume 116
Abstract
This paper proposes an approach using spectral flatness measure to detect the glottal closure instant (GCI) and the glottal open region (GOR) within each glottal cycle in voiced speech. The spectral flatness measure is derived from the instantaneous spectra obtained in the analysis of speech using single frequency filtering (SFF) and zero time windowing (ZTW) methods. The Hilbert envelope of the numerator of group delay (HNGD) spectrum at each instant of time is obtained using the ZTW method. The HNGD spectrum highlights the important (like resonances) spectral characteristics of the vocal tract system at each instant of time. The dynamic characteristics of the vocal tract system can be tracked by the spectral flatness feature of the HNGD spectrum, thus bringing out the characteristics of the vocal tract system when the subglottal region is coupled with the supraglottal region during the open phase of the glottal cycle. The SFF spectra at each instant change significantly at the location of the GCI. The GCIs can be detected using the changes in the spectral flatness information derived from the SFF spectra. The proposed methods of detection of GCI and GOR is compared with several existing methods.
Description
Keywords
Excitation source, Glottal Closure Instants, Glottal open region, Single frequency filtering, Speech analysis, Zero time windowing
Other note
Citation
Kadiri , S , Prasad , R S & Yegnanarayana , B 2020 , ' Detection of glottal closure instant and glottal open region from speech signals using spectral flatness measure ' , Speech Communication , vol. 116 , pp. 30-43 . https://doi.org/10.1016/j.specom.2019.11.004