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Digital vs. Analog Signals (Digital (discrete time signals, square waves,…
Digital vs. Analog Signals
Digital
discrete time signals
square waves
Examples: computers, CDs, DVD, digital electronic devices
doesn't deteriorate over distance
flexible in implementation
instruments that use digital draw less power
Samples analog waveforms into numbers
less likely to be affected by noise
Analog
continuous signal
sine waves
human voice in air, analog devices
records waveforms as they are
subject to deterioration over distance
affected by noise which reduces accuracy
analog instruments draw more power
Why digital is better
Analog signals deteriorate over distance
Analog signals are susceptible
to noise interference
Digital signals are reproduced
more accurately by receivers
Since digitized signals are sent
as wave pulses, they have
higher reliability than analog.
