What's The Difference In Analog Signal Digital Signal?


3 Answers

Anonymous Profile
Anonymous answered
Data travels from one point to other point by using electromagnetic signals in a communications system. Two types of electromagnetic signals exist. One is called analog signal and other is called digital signal.In analog signal intensity varies smoothly with the passage of time. Examples of analog signal are voice and video, because in both cases frequency varies smoothly with the passage of time. Most familiar form of analog data is audio which the form of acoustic sound waves. Analog signal can propagate over a variety of media; examples are wire media (Twisted pair, Coaxial cable etc) and unguided media (atmosphere or space propagation).

In digital signal intensity does not vary in a smooth fashion as it maintains a constant level for some period of time and then changes to another level. Text and integers are the examples of digital signals. A digital signal may be transmitted over a wire medium. It represents a stream of 1s and 0s which may represent digital data or may be an encoding of analog data. Advantage of digital signal is that, it is cheaper than analog signal. Disadvantage of digital signal is that, it suffers more from attenuation than analog signal.
Florio Potter Profile
Florio Potter answered


Analog signal is a continuous signal which represents
physical measurements.

Denoted by sine waves

Uses continuous range of values to
represent information.

Human voice in air, analog electronic devices.

Analog technology records waveforms as they are.


Digital signals are discrete time signals generated by
digital modulation.

Denoted by square waves

Uses discrete or discontinuous values to represent

Computers, CDs, DVDs, and other digital electronic devices.

Samples analog waveforms into a limited set of numbers and
records them.

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shahid tauqeer Profile
shahid tauqeer answered
Analog Signal
A continuous representation of a continuous event.
An analog connection is one which continuously varies in amplitude and frequency.

The amplitude of the signal is representation of its loudness while the frequency represents its tone or pitch.

Digital Signal
A digital signal is defined at discrete times only represented by fixed states "digits".
Most usually it is represented by a binary signals with '1s' or '0s' represented by a positive voltage or zero voltage, or by two different carrier frequencies or phases. In optical fiber system '1s' or '0s' may be represented by 'light on' or 'light off'.

Why Digital instead of Analog
Quality of signals with analog systems varies as overall distance of the circuit varies since noise increases as the circuit becomes longer.
Amplifiers used in analog systems amplify the noise along with the original signal.
With digital systems only one of certain number of possible states exist (1 or 0) which if identified can be used to recreate the original signal from an degraded input.
REGENARATION is the key benefit of digital transmission systems.

By adopting digital systems the noise performance of a long distance telephone channel is as good as that of a short distance channel.

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