Laryngeal adduction related to characteristics of the flow glottogram

Laryngeal adduction is a basic phonatory property related to voice quality and vocal pathology. In this study, simultaneous inverse filtered airflow and electroglottographic recordings were made for two male subjects phonating at deliberately varied pitches, loudness levels, and qualities. The goal of the study was to relate temporal characteristics associated with adduction with flow characteristics of the flow glottogram. A triangular model of laryngeal flow glottograms predicts that $Ûω/Û̇ = k2π(Q0 − Qr)$⁠, where Û is the peak flow, $Û̇$ the negative peak flow derivative, Q₀ is the open quotient (the duration the flow is above the baseline, divided by the period), Q_r is the rise quotient (the duration the flow rises from baseline to peak, divided by the period), and k = 1. Empirical results suggest k ≐ 0.5. These findings will be discussed, and a variety of adduction measures applied to the data will be compared.