unit 1.3 Data storage and compression

Question 1

Data measurement units

Answer 1

Bit- This is the smallest measurement of data.
Nibble- There are 4 bits in a nibble
Byte- There are 8 bits in a byte
Kibibyte- There are 1024 bytes in a Kibibyte.
Mebibyte- There are 1024 kibibytes in Mebibyte.
Gibibyte- There are 1024 Mebibytes in a Gibibyte.
Tebibyte- There are 1024 Gibibytes in a tebibyte.
Pebibyte- There are 1024 Tebibytes in a Pebibyte.
Exbibyte- There are 1024 Pebibytes in a Exbibyte.

Question 2

Calculate image file

Answer 2

width of image x height of image x color depth of image x number of images in a file.

Question 3

Calculate sound file

Answer 3

sample rate x sample resolutiom x length of soundtrack

Question 5

what is compression used for?

Answer 5

to reduce the size of the file

Question 6

What are the impacts of reducing the size of the file?

Answer 6

• Less bandwidth required
• Less storage space required
• Shorter transmission time

Question 7

lossless compression

Answer 7

Reduces the file size without permanent loss of data. E.g run length encoding ( An algorithm that groups together repeating patterns and indexes them)

Question 8

Lossy compression

Answer 8

Reduces the file size by permanently removing data. E.g Reducing resolution or color depth