P2 Analogue and Digital Signal

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P2 Analogue and Digital Signal

SimilaritiesGetting Started

  • Both weaken as they travel
  • They both pick up noise or interference
  • Both use Electromagnetic Waves as 'Carrier Waves' to transmit information.

Differences

  • Analogue Signals vary in amplitude/frequency
  • Digital can only take the form of On's (1's) and Off's (0's)
  • Digital Signals are far better quality - noise is less of a problem as it can be cleaned.
  • Digital can be transmitted several signals at a time using just one Cable or E.M. Carrier wave so you can send more information.

Overall comparison

As a signal travels from one place to another it can pick up interference from it's surroundings or from other signals. The main difference between the two types of signal is its ability to 'clean' the signal - Analogue signals can't be cleaned, once it has gained interference and has weakened it is amplified, still containing the interference. Digital on the other hand can be 'cleaned' effectively as there is no speculation about whether a signal is On or Off and so the signal that is released is the same quality as the signal that is received. The other major difference between the two is the form that the signals take; Analogue signals are simple waves transmitted from place to place, whereas Digital is a series of electric pulses travelling along a wire (Like an Optical Fibre).  

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