difference between digital signal and analog signal pdf

Difference Between Digital Signal And Analog Signal Pdf

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Analog and digital signals are used to transmit information, usually through electric signals. In both these technologies, the information, such as any audio or video, is transformed into electric signals.

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Difference between the Analog signals and Digital signals

Analog and digital signals are different types which are mainly used to carry the data from one apparatus to another. Analog signals are continuous wave signals that change with time period whereas digital is a discrete signal is a nature. The main difference between analog and digital signals is, analog signals are represented with the sine waves whereas digital signals are represented with square waves. In some way, an electronics project mainly interacts by the real analog world whereas digital signals with computers, microprocessors, and logic units. These two kinds of signals are similar to different electronic languages.

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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: What is Signal? What is an Analog Signal? What is a Digital Signal?

Analog vs. Digital

The communication that occurs in our day-to-day life is in the form of signals. These signals, such as sound signals, generally, are analog in nature. When the communication needs to be established over a distance, then the analog signals are sent through wire, using different techniques for effective transmission. The conventional methods of communication used analog signals for long distance communications, which suffer from many losses such as distortion, interference, and other losses including security breach. In order to overcome these problems, the signals are digitized using different techniques. The digitized signals allow the communication to be more clear and accurate without losses.

An analog signal is any continuous signal for which the time-varying feature of the signal is a representation of some other time-varying quantity, i. For example, in an analog audio signal , the instantaneous voltage of the signal varies continuously with the pressure of the sound waves. It differs from a digital signal , in which the continuous quantity is a representation of a sequence of discrete values which can only take on one of a finite number of values. The term analog signal usually refers to electrical signals ; however, mechanical , pneumatic , hydraulic , and other systems may also convey or be considered analog signals. An analog signal uses some property of the medium to convey the signal's information. For example, an aneroid barometer uses rotary position as the signal to convey pressure information. In an electrical signal, the voltage , current , or frequency of the signal may be varied to represent the information.


Signal Analog signal is a continuous signal which represents physical measurements. Digital signals are discrete time signals generated by digital modulation. Example Human voice in air, analog electronic devices.


Differences between Analog Signal and Digital Signal

Most of the image sensors are in the analog signal, and digital processing cannot be applied on it, as it requires infinite memory to store because signals have an infinite value that is why we cannot store it. To convert an analog signal into a digital signal, both its axis x,y are converted into digital format. As we can see that image is continuous in its coordinates x-y. So sampling deals with digitizing of co-ordinates and quantization deals with digitizing the amplitude.

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