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Digital and Analog Computer

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Digital Computer:


  • A digital computer uses distinct values to represent the data internally.
  • All information are represented using the digital 0's and 1's.
  • Digital signal represents particular state that is: 0 (low) or 1 (high), yes or No, On or OFF, True or False.
  • These systems store and process the data in digital form (string of 0's and 1's).
  • They are capable of processing analog signals but the analog signals have to be converted into digital signals using an ADC before feeding into the digital computer.

Analog Computer:

  • Analog computer is another kind of a computer that represents data as variable across a continuous rang of values.
  • Analog computers are used for measuring of parameters that vary continuously in real time, such as temperature, pressure and voltage.
  • Analogue computers are used in hospital to measure the size of stone in kidney and mental disease diagnostics (CT scan with photos).
  • These computer use OP-AMP (Operational Amplifier).
  • Examples Seismograph

Hybrid Computer:

  • These computers are a combination of both digital and analog computers.
  • Hybrid computers are computers that exhibit features of analog computer and digital computers.
  • It is used in industrial process control, jet plan, airplanes.
  • These computers are mainly used in hospital to measure the heart beat of patient.
  • It can transfer data from analog to digital and digital to analog.


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