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| Frage | Antworten |
| Name some uses of infrared signals in transmissions | Remote controls - tv, DVD WiFi - short distance links Computer - printer |
| What do thermal imaging cameras detect? | Infrared heat |
| Name the two types of signals | Analogue and digital |
| Advantages of digital signals | Multiplexing - one or more signals been carried down by an optic fibre. Easier to remove interference |
| Advantages of optic fibres | Can carry lots of information/signals & rapid & uses pulses of light to transmit data |
| Why is the digital switchover happening? | More channels can be received and there is less likely to be fuzzy or 'noisy' because digital signals don't suffer with interference as much |
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