Definition of Signals Electrical Engineering (EE) Notes | EduRev

Digital Signal Processing

Electrical Engineering (EE) : Definition of Signals Electrical Engineering (EE) Notes | EduRev

The document Definition of Signals Electrical Engineering (EE) Notes | EduRev is a part of the Electrical Engineering (EE) Course Digital Signal Processing.
All you need of Electrical Engineering (EE) at this link: Electrical Engineering (EE)

Definition

Anything that carries information can be called as signal. It can also be defined as a physical quantity that varies with time, temperature, pressure or with any independent variables such as speech signal or video signal.

The process of operation in which the characteristics of a signal (Amplitude, shape, phase, frequency, etc.) undergoes a change is known as signal processing.

Note − Any unwanted signal interfering with the main signal is termed as noise. So, noise is also a signal but unwanted.

According to their representation and processing, signals can be classified into various categories details of which are discussed below.

Continuous Time Signals

Continuous-time signals are defined along a continuum of time and are thus, represented by a continuous independent variable. Continuous-time signals are often referred to as analog signals.

This type of signal shows continuity both in amplitude and time. These will have values at each instant of time. Sine and cosine functions are the best example of Continuous time signal.

Definition of Signals Electrical Engineering (EE) Notes | EduRev

The signal shown above is an example of continuous time signal because we can get value of signal at each instant of time.

Discrete Time signals

The signals, which are defined at discrete times are known as discrete signals. Therefore, every independent variable has distinct value. Thus, they are represented as sequence of numbers.

Although speech and video signals have the privilege to be represented in both continuous and discrete time format; under certain circumstances, they are identical. Amplitudes also show discrete characteristics. Perfect example of this is a digital signal; whose amplitude and time both are discrete.

Definition of Signals Electrical Engineering (EE) Notes | EduRev

The figure above depicts a discrete signal’s discrete amplitude characteristic over a period of time. Mathematically, these types of signals can be formularized as;

Definition of Signals Electrical Engineering (EE) Notes | EduRev

Where, n is an integer.

It is a sequence of numbers x, where nth number in the sequence is represented as x[n].

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

MCQs

,

Definition of Signals Electrical Engineering (EE) Notes | EduRev

,

Semester Notes

,

Viva Questions

,

past year papers

,

study material

,

pdf

,

Previous Year Questions with Solutions

,

mock tests for examination

,

shortcuts and tricks

,

Free

,

Important questions

,

Definition of Signals Electrical Engineering (EE) Notes | EduRev

,

practice quizzes

,

Exam

,

video lectures

,

Objective type Questions

,

ppt

,

Extra Questions

,

Summary

,

Sample Paper

,

Definition of Signals Electrical Engineering (EE) Notes | EduRev

;