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|ANALOGUE AND DIGITAL SYSTEMS
|V. Ryan © 2002 - 2009
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|Electrical signals are in
These are usually older electronic gadgets (introduced before the mid
1990’s). A good example of an analogue signal is the loud-speaker of a
stereo system. When the volume is turned up the sound increases slowly
Examples of analogue systems include;
Old radios, megaphones and the volume control on old telephone hand sets.
This graph is typical of analogue signals.
Digital Signals: Modern electronic products such as computers and mobile phones depend on digital signals. However, a good example of a digital signal is Morse Code. The signal is sent as a series of ‘on’ and ‘off’ pulses. The signal is either present or it is not. Morse code was introduced in 1837 by Samuel Morse, as a method of communication.
For further information on digital computers - see Bits and BYTES.
Both analogue and digital systems can be used as sensors. A thermistor is analogue as resistance slowly changes, a micro-switch is digital, as it is ‘on’ or ‘off’.
Computers are digital devices and the various electronic parts communicate using 1’s and 0’s.
1 = ON
0 = OFF
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