Data: Unit 13

Question 1

What is a character set?

Answer 1

the defined list of characters recognized by a computer’s hardware and software

Question 2

What is ACII CODE?

Answer 2

Originally its character codes were 7 bits long, but then it was extended to have a bit length of 8

Question 3

how many characters codes were held in the original ASCII?
the new ASCII?

Answer 3

original:- 128 characters
new:- 256 characters.

Question 4

what is unicode?

Answer 4

Unicode was developed as ASCII couldn’t hold all possible characters.

Question 5

how many bits Unicode uses to store characters?

Answer 5

firstly 16 bits 2^16
later extended Unicode 2^24

Question 6

What is a pixel?

Answer 6

• short for pixel element, the smallest single point of color in a graphic image.

Question 7

What is resolution? how to calculate it?

Answer 7

• the number of pixels per inch when the image is displayed.
• width x height

Question 8

how to calculate a file size of a bitmap?

Answer 8

width x height x bit color depth

Question 9

What is color depth?

Answer 9

• no of bits allocated to represent each pixel color.

Question 10

how is the color depth found and the possible colors stored found?

Answer 10

according to the number of combination needed to encode a color

Question 11

What affects the file size of bitmap image?

Answer 11

• resoultion.
• color depth

Question 12

What is metadata?

Answer 12

• it is data about the data stored. eg:- the file name, file format.

Question 13

What is analogue signal?

Answer 13

digital signal

Question 14

what is bit depth?

Answer 14

the number of bits used to encode information from each sample.

Question 15

What is sample interval?

Answer 15

• the amount of time which passes between capturing each sample?

Question 16

What is sample rate?

Answer 16

• the number of samples stored pers second.

Question 17

What affects the quality of a digitally converted sound wave?

Answer 17

sample rate :- the greater the number of samples per second the higher the quality sound will be.
bit depth:- the greater the number of bit in each sample the similar will it be to the original analogue sound.

Question 18

What is fidelity?

Answer 18

• Fidelity is the no. of bits used for each sample the relationship between the original sound and the recording.

Question 19

how to calculate the size of the sample?

Answer 19

sample rate x bit depth x duration x number of channels*

Question 20

What is sampling?

Answer 20

• taking measurements of a sound wave at regular but different intervals of time/

Question 21

What is amplitude?

Answer 21

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