Perturbation analysis of EGG for detecting laryngeal pathology

In this study, the authors have evaluated the effect of amplitude and frequency perturbation of electroglottograph (EGG) signal during single vowels associated with laryngeal pathology. The normal EGG signal was correctly characterized by a 9th order autoregressive (AR) model using the parametric method. The optimal order of the AR model was analyzed by determining the transfer function. Perturbations in the fundamental pitch and in the peak amplitude of EGG signal were derived with a 4-electrode system using the modulation-demodulation techniques investigated for the purpose of developing a decision criteria for laryngeal function identification.