We perceive different audio frequencies as different tones. This video explains the way sound sources create different frequencies, and explores the range of human hearing. Like so many other fundamental concepts, once you have a grasp of frequency, you'll find that menus and options make more sense, and you can self-train more easily, as advanced display options like the Spectral Frequency Display or a frequency analysis tool will be easier to interpret.
- [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 one kilohertz range.…That's one thousand Hertz.…
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 Appropriate for all
Introduction to Video Dialogue Editingwith Ashley Kennedy3h 14m Appropriate for all
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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