3.23 understand the differences between analogue and digital signals

An analogue signal can take any value within a certiain range. The amplitude and frequency of an analogue wave can vary constantly.

A digital signal can only take two values. These values tend to be called either ON/OFF or 1/0. For example, you can send data along optical fibres as short pulses of light.

NOTE: a good way to remember which is which is that analogue is any

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