1.2 Text, sound and images

Question 1

character set

Answer 1

a collection of characters and the corresponding binary codes that represent them

Question 2

examples of character sets

Answer 2

• American Standard Code for Information Interchange (ASCII)
• Unicode

Question 3

Full form of ASCII

Answer 3

American Standard Code for Information Interchange (ASCII)

Question 4

ASCII code

Answer 4

-7-bit binary code to each character, including
uppercase and lowercase letters,
digits,
punctuation marks,
and control characters
-it only supports characters from the English language

Question 5

Unicode

Answer 5

16 / 32 bits
-can repersent all languages in the world

Question 6

Differences between Unicode and ASCII

Answer 6

-Unicode can represent a greater range of characters and symbols than ASCII including different languages and emojis
-Unicode requires more bits per character than ASCII, it can result in larger file sizes and slower processing times

Question 7

Sound

Answer 7

a type of analog signal that is captured and converted into digital form to be processed by a computer.

Question 8

Why is a process called sampling used?

Answer 8

To convert sound into digital form

Question 9

Process of sampling

Answer 9

taking measurements of the sound wave at regular intervals and converting these measurements into binary data

Question 10

The sample resolution

Answer 10

the number of bits per sample

Question 11

the sample rate

Answer 11

the number of samples taken in a second ( measured in hertz (Hz) )

Question 12

A higher sample rate and resolution results in a?

Answer 12

a more accurate representation of the original sound wave, but also increases the file size of the digital sound

Question 13

benefits of using a larger sampling resolution

Answer 13

better sound quality
less sound distortion

Question 14

drawbacks of using a larger sampling resolution

Answer 14

produces larger file size
takes longer to transmit/download music files

Question 15

pixel

Answer 15

the smallest component of the image

Question 16

How does a computer represent an image

Answer 16

An image is a series of pixels that are converted to binary, which is processed by a computer

Question 17

The colour depth

Answer 17

the number of bits used to represent each colour

Question 18

The image resolution

Answer 18

the number of pixels in the image

Question 19

The file size and quality of the image increase because?

Answer 19

the resolution and colour depth increase. This is because more pixels and colours require more binary data to represent them

Question 20

bitmap image

Answer 20

an image made up of pixels