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A signal is an electromagnetic or electrical current that is used for carrying data from one system or network to another. The signal is a function that conveys information about a phenomenon.
In electronics and telecommunications, it refers to any time-varying voltage that is an electromagnetic wave which carries information. A signal can also be defined as an observable change in quality such as quantity
In this tutorial, you will learn:
Analog signal is a continuous signal in which one time-varying quantity represents another time-based variable. These kind of signals works with physical values and natural phenomena such as earthquake, frequency, volcano, speed of wind, weight, lighting, etc.
A digital signal is a signal that is used to represent data as a sequence of separate values at any point in time. It can only take on one of a fixed number of values. This type of signal represents a real number within a constant range of values.
Here, are essential characteristics of Analog Signal
Here, are essential characteristics of Digital signals
Here are important differences between Analog and Digital Signal:
Analog | Digital |
An analog signal is a continuous signal that represents physical measurements. | Digital signals are time separated signals which are generated using digital modulation. |
It is denoted by sine waves | It is denoted by square waves |
It uses a continuous range of values that help you to represent information. | Digital signal uses discrete 0 and 1 to represent information. |
Temperature sensors, FM radio signals, Photocells, Light sensor, Resistive touch screen are examples of Analog signals. | Computers, CDs, DVDs are some examples of Digital signal. |
The analog signal bandwidth is low | The digital signal bandwidth is high. |
Analog signals are deteriorated by noise throughout transmission as well as write/read cycle. | Relatively a noise-immune system without deterioration during the transmission process and write/read cycle. |
Analog hardware never offers flexible implementation. | Digital hardware offers flexibility in implementation. |
It is suited for audio and video transmission. | It is suited for Computing and digital electronics. |
Processing can be done in real-time and consumes lesser bandwidth compared to a digital signal. | It never gives a guarantee that digital signal processing can be performed in real time. |
Analog instruments usually have s scale which is cramped at lower end and gives considerable observational errors. | Digital instruments never cause any kind of observational errors. |
Analog signal doesn't offer any fixed range. | Digital signal has a finite number, i.e., 0 and 1. |
Here, are pros/benefits of Analog Signals
Here, are pros/advantages of Digital Signals:
Here are cons/drawback of Analog Signals:
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