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GCSE     >Signal<     Bandwidth     Communication     Distortion     Noise     Waves    

Signal


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  GCSE    Signals  0 of 18    Question 514    Analogue Signals 
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Deadline not set13 of 18    Question 515    Digital Signal Facts 
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Voltages, Currents, Light Pulses, Smoke Signals which Represent Information

Input transducers produce electrical currents or voltages which are proportional to a measurement from the outside world.

Examples of signals representing ...

Analogue Signals

Analogue Signal

Digital Signals

Digital Signals

D to A and A to D Converters

A to D: It's possible to convert analogue signals into digital. The simplest converter is a Comparator. To record voice or music onto a phone, iPod or similar computing device, the analogue signal must be converted into digital.

D to A: It's possible to convert digital signals into analogue. To play music from a phone, iPod or similar device, digital data is first converted into analogue.

Signal Conditioning

There are many types of signal conditioning.

A simple example is to remove sudden changes from a light sensing circuit. For example, street lights come on at night by sensing the lack of daylight. It would be quite inconvenient if passing cars with bright headlights caused the streetllights to turn off. The light sensor signal must be processed to prevent this effect.

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