Analogue and Digital Signals Bullet pointed information on Analogue and Digial Signals 3.0 / 5 based on 1 rating ? PhysicsElectromagnetic SpectrumGCSEAll boards Created by: Stephanie17Created on: 14-05-12 18:06 Analogue signals Amplitude or frequency very continuously They can take any value in a particular range Example analogue devices include speedometers and thermometers 1 of 6 Digital signals Can only take two values Made up of pulses The pulses will be decoded by a digital receiver to get a copy of the original signal Example digital devices include On/Off switches and the displays on digital clocks or meters 2 of 6 Amplification Both digital and analogue signals weaken as they travel They have to therefore be amplified along their route The signals pick up interference or noise from electrical disturbances or other signals 3 of 6 Quality of digital signals Noise is less of a problem with these signals A 'noisy' digital signal will be easier to clean up as it can only be one of two values During amplification, the noise doesn't get amplified with the signal They are much higher quality because the info. received is the same as the original 4 of 6 Quality of analogue signals A noisy analogue signal can make it difficult to know what the original signal would have looked like The noise gets amplified as the signal does 5 of 6 Other benefits of digial signals Easy to process using computers as they are digital devices too You are able to transmit several signals at once using just one cable or EM waves, meaning more info can be sent in a given time than analogue signals 6 of 6
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