Parabolic Spectral Parameter - A new method for quantification
of the glottal flow.
P. Alku, H. Strik & E. Vilkman
Speech Communication 22, pp. 67-79.
This study presents a new frequency domain parameter, Parabolic Spectral
Parameter (PSP), for the quantification of glottal volume velocity
waveforms that have been obtained by inverse filtering acoustic speech
pressure signals. PSP is based on fitting a parabolic function to a
pitch-synchronously-computed spectrum of the estimated glottal flow. PSP
gives a single numerical value that describes how the spectral decay of an
obtained glottal flow behaves with respect to theoretical bounds
corresponding to maximal and minimal spectral decay. The performance of the
new parameter is compared to three commonly used time-based parameters and
to one previously developed frequency domain method by analyzing voices
produced by different phonation types.