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Flashcards in data transmission Deck (14)
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1
Q

complete this sentence… infrared signals carry information that allows…

A

electronic and electrical devices to be controlled

2
Q

how does a remote connect to the TV?

A

a coded signal is sent to a light emitted diode or LED at the front of the remote

3
Q

what does a remote control signal include?

A

a start command, the instruction command, a device code and a stop command

4
Q

name 3 benefits of digital signal…

A
  • improved signal quality
  • greater choice of programmes
  • being able to interact with the programme
5
Q

complete this sentence… optical fibres allow data to be

A

transmitted very quickly using pulses of light

6
Q

complete this sentence… before an analogue signal is transmitted…

A

it is added to a carrier wave

7
Q

how do remote controls work?

A

by emitting an infrared signal

8
Q

what are infrared sensors used for?

A

security alarms and thermal imaging cameras

9
Q

what do infrared sensors do?

A

detect low levels of infrared radiation from the body of an animal

10
Q

what is the signal emmited by a remote control called?`

A

a digital signal

11
Q

what does a height of a wave indicate?

A

loudness

12
Q

what does the distance between waves indicate?

A

pitch. High pitched sounds have closer together waves

13
Q

what does the information carried by infrared signals allow?

A

electronic and electrical devices to be controlled

14
Q

how do they do this?

A

by sending a coded digital signal from a remote controller to the device. Because digital signals have only two values, any small difference in the signal value will not be noticed and can easily be removed