Glottal airflow cycles through closed, opening and closing phases

Evidence

This is referred to as “glottal” airflow, since the space between the vocal folds is known as the “glottis.” Three key phases of the vibration cycle are usefully identified: closed phase (vocal folds together), opening phase (vocal folds parting) and closing phase (vocal folds coming together). The opening and closing phases are often referred to as the “open phase” as shown in the figure, because this is the time during which air flows. It should also be noted that airflow is not necessarily zero during the closed phase, since there are vocal fold vibration configurations for which the vocal folds do not come together over their whole length (e. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1331

Categorization

• DEFINE: Introduces the glottis, glottal airflow, closed/open phases, and larynx closed quotient (CQ) — core voice terminology.
• XREF: connects to: Pressure dynamics make vocal folds close faster than they open — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1326