From the course: Digital Media Foundations
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Capturing tone as frequency
From the course: Digital Media Foundations
Capturing tone as frequency
- [Narrator] When we speak of sound coming from a speaker, we're really talking about those waves of high and low air pressure traveling through the air that makes our eardrums vibrate in sympathy. The speed of the vibration is perceived as a particular tone. Hertz is the name given to anything that happens multiple times per second. So something that's 50 Hertz happens 50 times a second. The surface of a speaker has a resting position that we'll call zero. It moves out from zero to increase the air pressure and moves back through zero into the body of the speaker cabinet, to create low air pressure. Finally, it returns to its zero-point again. That's one full cycle. And because the movement is cyclic, it can be measured in degrees. Like a circular motion. Our ears can hear something like 20 Hertz to 20,000 Hertz though, as we age, the highest frequency we can hear goes down. For what it's worth, most of the energy in speech is around 300 to 500 Hertz. And most of the detail is around…
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