PARABOLIC SPECTRAL PARAMETER - A NEW METHOD FOR QUANTIFICATION OF THEGLOTTAL FLOW

This study presents a new frequency domain parameter, Parabolic Spectr al Parameter (PSP), for the quantification of the glottal volume veloc ity waveform. PSP is based on fitting a parabolic function to the low- frequency part of a pitch-synchronously computed spectrum of the estim ated glottal flow. PSP gives a single numerical value that describes h ow the spectral decay of an obtained glottal flow behaves with respect to a theoretical limit corresponding to maximal spectral decay. By an alyzing speech signals of different phonation types the performance of the new parameter is compared to three commonly used time-based param eters and to one previously developed frequency domain method. (C) 199 7 Elsevier Science B.V.