Vocal tract transmission depends solely on the cross-sectional area function.
Evidence
The vocal tract acts as an acoustic transmission line where the glottal excitation propagates to the lips. While the uvular link to the nasal cavity is open, the coupling of the nasal tract creates nasal or nasalized sounds. The shape of the tract is determined by the position of the tongue and its tip, the opening of the jaw, and the shape of the lip opening. From an acoustic point of view, the transmission properties of the vocal tract are due to the cross-sectional area function of the tract A(x), where x is the position in the glottis–lips dimension. According to Equation (2.23), the acoustic impedance at each point is Za(x) = ρc/A(x); that is, it is inversely proportional to the area. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 613
Categorization
Category: Definitional Content
- DEFINE: Defines the area function A(x) as the fundamental description of vocal-tract transmission.
- XREF: Area-function-only dependence is the basis of articulatory synthesis and why tongue/jaw/lips fully determine vowels.
Related
- Vocal tract acoustics reduce to a cross-sectional area function along one axis (similarity 0.96)
- Vocal tract sound transmission is governed by cross-sectional area (similarity 0.85)
- The speech tract is modeled as a transmission line with pressure and volume-velocity variables (similarity 0.84)
- Articulation shapes the voice by filtering glottal sound through the vocal tract (similarity 0.80)
- The vocal tract can be simulated as a cascade of acoustic transmission line segments (similarity 0.79)