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Computing - Organised > Data Representation - Storing Images and Sound > Flashcards

Data Representation - Storing Images and Sound Flashcards

1
Q

What is the most common type of image?

A

A bitmap

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2
Q

What are bitmap images?

A

Images made up of tiny dots called pixels

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3
Q

What colour is 0 in bitmap?

A

White

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4
Q

What colour is 1 in bitmap?

A

Black

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5
Q

How many bits represent each pixel in a black and white photo?

A

1 bit as there are only two colours

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6
Q

How many colours are in 2-bit images?

A

4 colours

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7
Q

What are the colours and their respective binary values in 2-bit images?

A

00 = white
01 = light grey
10 = dark grey
11 = black

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8
Q

What is colour depth?

A

The number of bits used per pixel

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9
Q

How do you work out the total amount of colours with colour depth?

A

Total amount of colours = 2 to the power of bits per pixel (1-bit image = 2 to the power of 1)

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10
Q

What colour depth do most devices?

A

24-bit colour depth

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11
Q

What is image size?

A

The number of pixel in an image (width x height)

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12
Q

What does more pixel mean for the image?

A

The image will have a higher quality

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13
Q

How do you work out file size in bits?

A

Image size (length x width) x colour depth

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14
Q

How is sound recorded by a microphone?

A

As an analogue signal

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15
Q

What are analogue signals?

A

Pieces of continually changing data

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16
Q

What does an analogue to digital converter do?

A

Converts analogue signals into digital data that computers can read and store

17
Q

What is sampling?

A

The process of converting an analogue signal to digital data

18
Q

How do you convert analogue recording to digital data?

A

Sample the amplitude of the wave at regular intervals - amplitude can only take values depending on the sample resolution

19
Q

Why is digital data different to an analogue wave?

A

Digital data isn’t continuous so it loses a lot of data

20
Q

What is the sample rate?

A

The amount of samples taken per second

21
Q

What is sample rate measured in?

A

Hertz (Hz)

22
Q

How many Hertz are in 1 kilohertz?

A

1000 Hertz

23
Q

What is sample resolution?

A

The number of bits available for each sample

24
Q

What is the bit rate?

A

Sample rate (Hz) x sample resolution (bits)

25
Q

What is the formula for file size?

A

Sample rate (Hz) x sample resolution (bits) x length (seconds)

26
Q

What will increasing the sample rate do?

A

The sound will be of better quality and will more closely match the original recording

27
Q

What would increasing the sample resolution do?

A

Make the sampled sound closer to the quality of the original recording by PICKING UP QUIETER SOUNDS

28
Q

What is the disadvantages of increasing the sample rate and sample resolution?

A

It will increase the file size

Computing - Organised (22 decks)

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