Vibratory characteristics of healthy female vocal folds. Evidence from HSDI

Laryngeal images obtained from HSDI of healthy females were examined with customized software that delineated glottal edges and used the Hilbert transform based method of analysis to provide objective quantification of glottal perturbation; transformed glottal cycles provided visual patterns on the overall vibratory dynamics. Data showed absence of homogenous glottal vibratory patterns: clear (50%), pressed (27%), breathy (15%), or a mixed voice quality (8%). Perturbation range for jitter and shimmer were small and did not discriminate these patterns.