If a speaker phonates while making his vocal tract approximate a uniform tube, the vowel that will be produced is schwa.
Because vowels are quite sonorous because there is no impediment in the vocal tract when they are produced. Each vowel is shaped by the tongue's body moving within the mouth, and for some vowels, the lips are also rounded.
All components of the sound produced by the vocal folds are resonant and filtered by the vocal tract. The fact that the vocal folds alone produce an incomprehensible buzz-tone makes us aware of how essential the filter/resonator is to producing a pleasing and understandable sound.
The vocal tract resonates like a tube that is closed at one end to shape an input signal produced by the vibrating vocal folds, according to the acoustic theory of vowel production.
The resonance patterns of a tube that is closed at one end and the shaping of an input by a resonator, which are the two main ideas put forwards in this broad presentation of the theory.
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