Speech Production. Physics of the Human Body. The Physics of Speech. Speech sounds are produced by changes in pressure of an outward flow of air from the lungs. The final sound is dictated by the way the air moves through the nose, mouth, and throat (collectively: the vocal apparatus).
Physics of the Human Body
It is important to note that resonant frequencies are determined by the physical dimensions of the vibrating object.Resonance
When pushing a child on a swing, the preferred path as per the specifications of the system is straight up and down, and can be accomplished with ease (this path is the “resonant frequency” which results in greater amplification [height in this instance]). However, when pushing the child in a different direction, it becomes more difficult to produce such a result.
A B* C.
Where A is the airflow of varying pressure after leaving the vocal folds (sound is a pressure wave.)
And B is the variable dictating the final construct of the sound.
The vocal tract acts like a variable filter because it reacts differently at different frequencies. (1)
It is variable because by changing the position of your tongue, jaw, lips, etc. you can change the overall frequency response.
The Oral Cavity primarily consists of the:
The oral cavity is the most important component of the vocal tract because its size and shape can be varied by adjusting the relative positions of the palate, the tongue, the lips, and the teeth.
Adult Male – 125 Hz
Adult Female – 220 Hz
Children – 300 Hz
Pitch in Air:
Pitch in Helium: