{P1}{Digital Technology}

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  • Created by: Em
  • Created on: 04-01-13 17:54


An analogue wave can take any value within a certain range (analogue - any).

A digital signal cna only take two values. They tend to be called on/off or 1/0. For example, you can send data along optical fibres as short pulses of light.


Both digital and analogue signals weaken as they travel, so they need to be amplified along their route. Interference also causes random disturbances, called noise, which can lead to very poor quality signal. 

When you amplify an analogue signal, the low - amplitude noise is amplified too. So every time it's amolified, the signal loses quality. 

With a digital signak, the low amplitude noise is just ignored. So the signal remains high quality. 

Another advantage of digital technology is that you can transmit everal signals at the same time using


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