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Computer Science > Topic 2 - Data Representation > Flashcards

Topic 2 - Data Representation Flashcards

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1
Q

What is 7-bit ASCII

A

Each character is represented by a number

7-bits gives you a maximum of 128 character combinations

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2
Q

What is Amplitude?

A

Sound amplitude is experienced as the loudness of sound with sound waves, this is the extent to which air particles are displaced

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3
Q

What is Analogue sound?

A

Audio in a format of continuous vibrations or waves

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4
Q

What is Binary?

A

A base 2 number system, which is represented in 1’s and 0’s

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5
Q

What is Binary pattern?

A

A sequence of 1s and 0s

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6
Q

What is Binary shift?

A

Moving the bit pattern in a register left or right a given number of positions

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7
Q

What is a Bit?

A

A binary digit (the smallest unit)

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8
Q

What is Bit depth?

A

The number of bits used to store each sample

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9
Q

What is Bitmap graphic?

A

An image format where the picture is made up of individual pixels

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10
Q

What is a Byte?

A

8 bits

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11
Q

What is Colour depth?

A

The number of bits used to store a single pixel

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12
Q

What is Data compression?

A

Reducing the size of a file

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13
Q

What is Denary (base 10)?

A

A numerical system of notation which uses 10 as its base

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14
Q

What is a Gibibyte?

A

Gibi: 1 gibibyte is 1024 mebibytes

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15
Q

What is Hexadecimal (base 16)?

A

A numerical system of notation which uses 16 rather than 10 as its base
The 16 Hex base digits are 0-9 and the letters A-F

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16
Q

What is a Kibibyte?

A

1 kibibyte is 1024 bytes

17
Q

What is Lossless compression?

A

Partial reduction in file size but none of the data is lost, the original file can be recreated from the compressed data

18
Q

What is Lossy compression?

A

Greatly reduces file size but some data is lost

19
Q

What is a Mebibyte?

A

1024 kibibytes

20
Q

What is a Nibble?

A

4 bits

21
Q

What is Overflow?

A

When there are insufficient bits to store a number after a calculation due to a final carry bit

22
Q

What is a Pixel?

A

A single dot of colour in a bitmap image or on a computer screen

23
Q

What is Resolution?

A

The number of pixels contained on a display monitor

24
Q

What is Sample interval?

A

The amount of time that passes between capturing each sample

25
Q

What is Sample rate?

A

How many samples of data are taken per second.

26
Q

What is a Tebibyte?

A

1 tebibyte is 1024 gibibytes

27
Q

What is Two’s complement?

A

The way most computers represent positive or negative integers

28
Q

What are Unsigned integers?

A

A positive whole number – includes 0

Computer Science (5 decks)

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