Analog and Digital Signal System

Analog Signal System The term Analog is a taken from “Greek” word “analogos”. Analog signals are a representation of time varying quantities in a continuous signal. Analog signals work with natural phenomena and physical values like frequency, earthquake, volcano, flow of water, speed of wind, weight, lighting etc.

Analog Device for Measuring Earthquakes

Example of Analog Signal Based Computer

In 1959 it was used for solving equations.

Characteristics of Analog Signal

It works on continuous data. It is used to measure natural or physical

values. It is specific to a particular task. Hence it is

not versatile. Accuracy of analog signal is not high in

comparison of digital signal. Analog signal output form is like Curve, Line

or Graph, so it may not be meaningful to all.

Digital Signal System The Digital signal having a discrete set of

values. Digital signals are a series of ONs and OFFs (represented by 1s and 0s). These can be voltages going from a high (one) value to a low (zero) value or flashes of light. It is usually encoded into binary in order to carry out the information.

General purpose computer is best example of digital signal system based computer.

Characteristics statics of Digital Signal Digital Signal are continuous signals Digital signal based on binary form

0’s and 1’s Digital signal can be processed and

transmitted more efficiently and reliable than analog signal.

Digital signal are versatile, we can use digital signals widely than analog signals

Accuracy of digital signal is higher than that of analog signal