analogue to digital

Question 1

What is analogue signal?

Answer 1

is one that continuously changes its values

Question 2

What is a digital signal?

Answer 2

a series of pulses consisting of just two states, ON(1) or OFF (0) with no values in between

Question 3

What is a disadvantage of using an analogue wave?

Answer 3

• possibility of interference
• can cause static
• noise

Question 4

How is digital data transmitted?

Answer 4

• as clear cut discreet units
• 0s and 1s show electrical signals as being on or off

Question 5

What are the advantages of using digital transmission?

Answer 5

• more reliable across longer distances
  -can be replicated any time you need a copy
• carry large amounts of info
• can have longer cables without signal loss being a problem
• quality is better because there is less energy loss

Question 6

What is digital sampling?

Answer 6

converting an analogue signal into a digital signal
- connect it to a sensor to give an analogue signal into the ADC input
- select sampling rate and sensitivity
- send digital output signal to a display

Question 7

sampling rate

Answer 7

number of times per second that the quality is measured

Question 8

sampling sensitivity

Answer 8

• the smallest increment in the quantity that is measured and recorded

Question 9

why transmit in digital?

Answer 9

• more data fitted in the same bandwith
  -most interference can be eliminated giving a higher quality
• can be stored and processed by a computer