1.3 - File compression Flashcards
1
Q
What are the two types of compression? [2]
A
Lossy and Lossless
2
Q
What is lossy compression? [1]
A
if you compress a file, you lose some portion of it
3
Q
What is lossless compression? [2]
A
- if you compress a file, you lose nothing
- when you decompress you get everything back
4
Q
What is the sound range that humans can hear? [2]
A
20Hz - 20,000Hz
5
Q
What are some ways to use perceptual music shaping? [3]
A
- reduce sample rate and sample resolution
- cut and throw frequencies that can’t be heard by humans
- remove software sound
6
Q
Perceptual music shaping is an example of what sort of compression? [1]
A
lossy
7
Q
What do mp3 files store? [1]
A
audio
8
Q
What do mp4 files store? [4]
A
- pictures
- music
- videos
- animations
9
Q
What is run length encoding used for? [2]
A
- lossless compression
- to reduce text size and photo file
10
Q
What type of compression can pictures have? [1]
A
both lossy and lossless
11
Q
A
