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what is the difference between analog and digital
communications? which is the efficient communication??
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Answer Posted / priya p
differences betwwen analog and digital communication
1.in analog communication, the signal can take up voltage
level corresponding to any real number,
2. hence once it is corrupted with noise it is difficult to
recover the correct value.
3. repeaters in analog communication are amplifiers which
also amplifies noise thereby degrading the quality of the
system.
4.since the voltage can take infinite levels, it would need
infinite bits to represent data.
5.analog data is continuous time continuous amplitude data.
1.in digital communication signal can take up only one among
two voltage levels corresponding to 1 and 0.
2. hence even if it is corrupted by channel noise it is
possible to recover the original information by using a
suitable threshold at the receiver.
3.repeaters in digital communication can be wave
regenerators which produce new waveforms after recovering
the original information from the received waveform and
hence noise does not accumulate through a digital
communication link as in analog link.
4.since the voltage can take only finite number of values,
it requires finite number of bits for propagation. 5.digital
data is discrete time discrete amplitude data.
digital communication is more efficient in terms of noise
immunity and quality.
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