01.03 - Compression

Question 1

Lossless file compression

Answer 1

File compression method where the original file can be restored following decompression

Question 2

Lossy file compression

Answer 2

File compression method where the original file can be restored following decompression

Question 3

JPEG

Answer 3

Joint Photographic Expert Group - a form of lossy file compression based on the inability of the eye to spot certain colour changes and hues

Question 4

MP3/MP4

Answer 4

File compression method used for music and multimedia files

Question 5

Audio compression

Answer 5

Method used to reduce the size of a sound file using perceptual music shaping

Question 6

Perceptual music shaping

Answer 6

Method where sounds outside the normal range of hearing of humans, for example, are eliminated from the music file during compression

Question 7

Bit rate

Answer 7

Number of bits per second that can be transmitted over a network. It is a measure of the data transfer rate over a digital telecoms network

Question 8

Run length encoding (RLE)

Answer 8

A lossless file compression technique used to reduce text and photo files in particular