Voiced speech originates from airflow through the vibrating vocal folds across the glottis

Evidence

The source of voiced speech is the airflow that is generated by the vocal folds located in the larynx (see Figure 5.2). The vocal folds are two horizontal tissues with an elastic membrane coating called mucosa (see Figure 5.3). The positioning and tension of the vocal folds are adjusted by the attached muscles. The orifice between the vocal folds is called the glottis. The area of the glottis is at its widest during breathing. During speech production, the glottal area varies temporally between zero and its maximum value. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 548

Categorization

• DEFINE: Clarifies larynx anatomy: vocal folds, mucosa, glottis, and their breath vs. speech configuration.
• corroborated: 3 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 548
• XREF: connects to: Lip and vocal fold vibration is driven by Bernoulli pressure reduction from airflow — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1240