Unit 2: Data Representation

elgraney
Mind Map by elgraney, updated more than 1 year ago
elgraney
Created by elgraney almost 7 years ago
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GCSE Data Representation Mind Map on Unit 2: Data Representation, created by elgraney on 10/12/2013.
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Unit 2: Data Representation
1 Numbers
1.1 Denary
1.1.1 base 10: normal
1.2 hexadecimal
1.2.1 base 16
1.2.1.1 0-9, A-F
1.2.2 represents 4 bits per digit
1.3 Binary
1.3.1 base 2
1.3.1.1 1 or 0
1.3.1.2 on or off
1.3.2 each digit represents a bit
2 images
2.1 bitmap
2.1.1 image stored as a series of values per pixel
2.1.1.1 Pixel is the smallest addressable value in an image
2.1.2 arranged as a grid
2.1.3 the resolution shows the number of pixels
2.2 vector
2.2.1 images drawn to a formula
2.2.2 rescaleing doesn't damage image quality
2.3 colour
2.3.1 displayed as different binary digits
2.3.2 colour depth is the number of bits used to display a colour of a single pixel in a bitmap
2.3.2.1 the higher the colour depth, the more available colours
3 Units
3.1 bit
3.1.1 1 or 0
3.2 byte
3.2.1 8 bits
3.3 nibble
3.3.1 4 bits
3.4 kilobyte
3.4.1 1024 bytes
3.5 Megabytes
3.5.1 1024 kilobytes
3.6 gigabyte
3.6.1 1024 megabytes
3.7 terabyte
3.7.1 1024gigabytes
3.8 petabyte
4 characters
4.1 unicode
4.1.1 16 bits
4.1.1.1 65,536 characters approx.
4.1.2 allows many more characters
4.1.3 takes more space
4.2 ASCII
4.2.1 American Standard Code for Information Interchange
4.2.2 7 bit character set
4.2.2.1 128 characters
4.2.2.2 extended ASCII contains 8 bits
4.2.2.2.1 256 characters
4.2.3 assigns a table of characters with unique binary values
5 sound
5.1 digital
5.1.1 the way in which computers read sound
5.1.2 sampling
5.1.2.1 creates representation of original values by measuring specific values
5.1.2.2 sample rate: times per second the sound wave is measured
5.1.2.2.1 normal rate is around 44KHZ
5.2 analogue
5.2.1 continuously changing wave
5.2.2 natural sound
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