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Computer Science > Data Representation > Flashcards

Data Representation Flashcards

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1
Q

What is a character set?

A

A defined list of characters recognised by a unique binary number.

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2
Q

Give some examples of character sets

A

ASCII, Unicode

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3
Q

What does ASCII stand for?

A

American standard for information interchange

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4
Q

What makes Unicode special?

A

It is international

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5
Q

What are the two ways images can be stored?

A

Bitmaps , vectors

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6
Q

What are bitmaps made up of?

A

Coloured squares

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7
Q

How are vectors made?

A

They store the mathematics to draw coloured shapes

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8
Q

What does the number of bits required for pixel depend on?

A

The number of colours required

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9
Q

How can the number of coloured be calculated?

A

2^n

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10
Q

What is the number of bits used for each pixel known as?

A

Colour depth

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11
Q

What is metadata?

A

Additional data stored within the image

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12
Q

Examples of metadata are…

A

Image width, height , colour depth, colour palette

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13
Q

Does the file size decrease or increase when the colour depth and resolution are increased?

A

Increase

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14
Q

What do bitmaps usually store?

A

Pictures

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15
Q

What do vectors usually store?

A

Technical drawings, logos, clip art

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16
Q

What is the sound file size?

A

The total number of bits in a sound

17
Q

How is the sound file size found?

A

Number of samples per second X number of bits per sample X length of sample in seconds

18
Q

What is the boy depth?

A

The number of bits stored per sample

19
Q

The higher the number of bits … the greater/worse the quality of sound?

A

Greater

20
Q

What is sample rate?

A

The number of samples stored per second

21
Q

What is compression?

A

Reducing the number of bits in a file

22
Q

Why is compression used?

A

To make the storage capacity of a file lower, making transfer of the file quicker

23
Q

What are the differences of lossy and lossless compression?

A

LOSSY:
-some of the data is lost and cannot be recovered
-Greatly reduces file size
-Reduces the quality of the image/sound

LOSSLESS:
-None of the data is lost, it is encoded differently
-Can be turned back into the original format
-Less effective than Lossy

24
Q

What type of files can Lossy work on?

A

Images, sound, video

25
Q

What types of file can Lossless work on?

A

Any

Computer Science (6 decks)

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