This paper discusses aerodynamic analysis, specifically addressing the technique of inverse filtering of the oral airflow signal. Aerodynamic analysis represents one technique used to quantify phonatory physiology. Analysis of glottal airflow waveforms derived from oral airflow signals is one method of achieving information regarding vocal fold dynamics during both normal and disordered voice production. Ten women diagnosed as having adductor SD and 10 women with no evidence of vocal abnormalities or vocal dysfunction were compared. Multivariate statistical analysis revealed significantly higher values for amplitude-based glottal airflow measures of maximum flow declination rate, peak glottal airflow, and minimum glottal airflow.
Spasmodic dysphonia affects the ability of the laryngeal mechanism to function effectively.
Results from our study demonstrate that certain amplitude-based glottal airflow parameters distinguish adductor SD from normal voice. Anatomical and physiological changes of the speech production mechanism that occur with aging may result in phonatory distinctions between older and younger speakers. This investigation examined amplitude-based glottal airflow characteristics from sustained vowel production in healthy adult women. Measures included peak, alternating, and minimum glottal airflow. Additionally, a ratio of minimum to peak glottal airflow was calculated.