1. Resonances of the Vocal Tract
What happens when you blow across the mouth of a bottle?

2. Resonances of the Vocal Tract
What happens when you blow across the mouth of a bottle?
Many different frequencies are produced.
Pressure builds inside then escapes in a burst of compressed air. This repeats itself ad nauseum.

3. Resonances of the Vocal Tract
Why do smaller bottles have higher frequencies?

4. Resonances of the Vocal Tract
Why do smaller bottles have higher frequencies?
There resonance frequency is high.
The frequency of the bottle will be amplified, and others damped.

5. Resonances of the Vocal Tract
If resonance of swing is 2 per second, only pushes at 2, 4, 6 will amplify swing height.

6. How is this related to speech?

7. How is this related to speech?
The vocal tract is a tube or series of tubes.

8. How is this related to speech?
The vocal tract is a tube or series of tubes.
With no obstruction a tube the size of the vocal tract with resonate at 500, 1500, 2500 and 2500Hz.
These are the formants of schwa.

9. How is this related to speech?
The tongue cuts the vocal tract into two tubes which causes the resonance frequencies to change.
The tongue (and pharynx) also narrows the vocal tract.
Lip rounding lengthens the tube.

10. Resonances of the vocal tract
Larynx during speech
Overtone singing
Source filter
Quartet
Speech manipulation