Amplitude is one of the core features of sound recording and reproduction. This video explains what amplitude actually is, and shows the way an audio monitor—or speaker—creates sound waves of varying volumes. The principle behind our perception of audio amplitude is a simple one, and understanding some of the physics and biology at work can help you make creative choices and deal with technical problems as you encounter them.
- [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.…We hear different amplitudes…
Get ready to remove the mystery behind terms you've encountered. If you work in a creative profession, this can enhance your command of the tools you use. Learn what a pixel really is, what color channels are, and what audio frequency is. Discover how color channels, bit depth, and video frame rates work. Find out the difference between codecs and file formats, and how compression is involved. By the end of this course, you'll know how to answer common client questions—like, whether a logo should be supplied in vector or bitmap form, and more.
Note: Motion graphics in this course were provided by Chelsea Parrish: chelseaparrish.com.
- What is a pixel?
- Aspect ratios
- Bit depth
- Alpha and transparency
- Light and color channels
- Color modes: RGB, YUV, CMYK
- Camera depth of field
- Chroma Key and Luma Key
- Blend modes
- Color wheels, vectorscopes, and waveforms
- Video compression and codecs
- Frame rates and timecode
- File formats
- Audio amplitude
- Capturing audio tone as frequency
- Audio timing using the phase
Skill Level Beginner
Learning Video Production and Editingwith Rob Garrott19m 25s Beginner
Video Foundations: Cameras and Shootingwith Anthony Q. Artis2h 58m Intermediate
Introduction to Video Dialogue Editingwith Ashley Kennedy3h 14m Intermediate
1. How Do Computers Think?
2. How Cameras and Computers Think about Color
3. The Language of Color
4. The Shape of Your Picture and the Speed of Your Video
5. Storing Everything (Codecs)
6. Color Wheels, Vectorscopes, and Waveforms
Understanding waveforms2m 39s
7. Making Changes
8. Audio Made Simple
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