The aim of the presentation is to investigate acoustic analysis of connected speech by means of an average-equalized and energy-equalized variogram to extract vocal dysperiodicities. The variogram enables positioning a current and a lagged analysis frame in adjacent speech cycles to track inter-cycle dysperiodicities. Average and energy equalization of the analysis frames are options that make it possible to compensate for slow deterministic changes of the speech signal amplitude in connected speech. The instantaneous dysperiodicity trace has been summarized by means of segmental and global signal-to-dysperiodicity ratios. Results show that signal-to-dysperiodicity ratios obtained by variogram analysis correlate strongly with the perceived degree of hoarseness when the analysis frames are energy-equalized. Equalizing the frame averages removes small artifacts in the instantaneous dysperiodicity trace that are caused by sound-to-sound transients or intrusive low-frequency noise.
Bibliographic reference. Alpan, A. / Kacha, A. / Grenez, Francis / Schoentgen, Jean (2007): "Assessment of vocal dysperiodicities in connected disordered speech", In INTERSPEECH-2007, 1178-1181.