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Analog Signal Vs Digital Signal
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Analog
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Digital
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Signal
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Analog signal is a continuous signal which represents physical
measurements.
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Digital signals are discrete time signals generated by digital
modulation.
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Waves
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Denoted by sine waves
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Denoted by square waves
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Representation
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Uses discrete or discontinuous values to represent information
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Example
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Human voice in air, analog electronic devices.
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Computers, CDs, DVDs, and other digital electronic devices.
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Technology
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Analog technology records waveforms as they are.
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Samples analog waveforms into a limited set of numbers and
records them.
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Data transmissions
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Subjected to deterioration by noise during transmission and
write/read cycle.
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Can be noise-immune without deterioration during transmission
and write/read cycle.
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Response to Noise
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More likely to get affected reducing accuracy
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Less affected since noise response are analog in nature
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Flexibility
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Analog hardware is not flexible.
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Digital hardware is flexible in implementation.
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Uses
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Can be used in analog devices only. Best suited for audio and
video transmission.
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Best suited for Computing and digital electronics.
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Applications
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Thermometer
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PCs, PDAs
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Bandwidth
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Analog signal processing can be done in real time and consumes
less bandwidth.
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There is no guarantee that digital signal processing can be done
in real time and consumes more bandwidth to carry out the same information.
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Memory
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Stored in the form of wave signal
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Stored in the form of binary bit
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Power
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Analog instrument draws large power
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Digital instrument drawS only negligible power
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Cost
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Low cost and portable
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Cost is high and not easily portable
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Impedance
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Low
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High order of 100 megaohm
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Errors
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Analog instruments usually have a scale which is cramped at
lower end and give considerable observational errors.
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Digital instruments are free from observational errors like
parallax and approximation errors.
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