- Analouge signals have a continuously variable value.
- Digital signals are either on (1) or off (0).
- Everyday uses of infrared radiation include remote controls.
- Infrared sensors detect body heat.
- The advantages of using digital signals are that it is easier to remove noise and you can use multiplexing.
- Multiplexing is when you send more than one signal on a carrier wave.
- The advantages of using optical fibres are multiplexing and lack of interference in the final signal.
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