Data Representation

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Binary
A base-2 counting system made of 1s and 0s
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Denery
A base-10 number system
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Hexadecimal
A base-16 number system using numbers 0-9 and letters A-F
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Check Digit
A digit added to a string of digits which is used to check if all the digits have been entered and read correctly
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Character Set
A group of characters that a computer recognises from their binary representation
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ASCII
A 7-bit character set consisting of 128 characters
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Unicode
A large character set that attempts to include all possible characters that may be written
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Pixel
Small dots that make up a bitmap image
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Metadata
Extra data stored in a file which gives information about the file’s properties
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Colour Depth
The number of bits used for each pixel in an image file
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Resolution
The density of pixels in an image, often measured in dpi
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Sampling
The process of converting analogue signals to digital data
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Sampling Intervals
The time between each sample
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Sample Size
The total number of bits available for each audio sample
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Bit Rate
The number of bits used per second of sampled audio
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Sampling Frequency
The number of audio samples that are taken per second
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Lossy Compression
Permanently removing data from a file to decrease the file size
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Lossless Compression
Temporarily removing data from a file to decrease the file size
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Other cards in this set

Card 2

Front

A base-10 number system

Back

Denery

Card 3

Front

A base-16 number system using numbers 0-9 and letters A-F

Back

Preview of the back of card 3

Card 4

Front

A digit added to a string of digits which is used to check if all the digits have been entered and read correctly

Back

Preview of the back of card 4

Card 5

Front

A group of characters that a computer recognises from their binary representation

Back

Preview of the back of card 5
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