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Data representation - Coggle Diagram
Data representation
Number systems
Binary
Binary left and right shifts
Left = multiplying by 2
Right = dividing by 2
Binary addition
Why computers use binary
Two's complement
Over flow - when there isn't enough space in a x-bit register
Base 1 number system
Denary
Our base 10 number system
Hexadecimal
base 16 number system
Text, sound and images
Character sets
ASCII
128 characters
Extended ASCII
255 characters
Unicode
149,186 characters
sound files
Sample resoloution
Sample rate
Image files
Resolution
Colour depth
Data storage and compression
Units
bit
nibble
byte
kibibyte
mebibyte
gibibyte
tebibyte
pebibyte
File sizes
Image
Sound