From the course: Digital Media Foundations
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Measuring the power of your sound with amplitude
From the course: Digital Media Foundations
Measuring the power of your sound with amplitude
- [Instructor] When the surface of a speaker beats the air, the distance the surface moves from its resting position is what creates the high or low pressure wave that travels through the air to your ear. The bigger the distance speaker moves, the more air pressure it creates when it moves out, and the lower the air pressure when it moves back inside the speaker cavity. It's this range of high pressure and low pressure air that bounces across the room to your ear, in much the way that ripples move across the surface of a pond. In your ear, there's a diaphragm that's moved by the air pressure waves. The more it moves, the more energy is generated and the louder the sound that's perceived. In technical terms, we're always talking about air pressure unless you're filming in another medium like under water, where the sound travels even more effectively because the water molecules are closer together. Air pressure follows a logical, linear scale from low to high, but our hearing doesn't…
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