Showing posts with label signal. Show all posts
Showing posts with label signal. Show all posts

13 Aug 2018

What is a Signal - Types of Signals and Examples of Signals

Here we will discuss- what is a signal, definitions of signal, interesting examples of signals in our daily life and different types of signals.
Do you know, whether you are walking, singing, speaking or dancing... You are producing signals !!! Our whole universe is mathematical...


Definition of Signal


1. Any physical quantity that varies with time and space is a Signal.

2. A Signal may be defined as a function of one or more independent variables like time, distance, position or temperature etc. that has some information about the phenomena (event) that produced it.

A signal can be a Motion signal, Sound signal, Image signal or Video signal etc. Now let's discuss each type of the signals-


Watch the Complete Video Here

Types of Signals


1. Motion signal

Any object that moves has a signal associated with it. 
To make it clear let's take an example-
The mathematical equation given below tells the position of a particle at any time instant-

x = 3t + 5

Here 'x' is the position and 't' is time

With the help of this equation you can easily find out the position of this particle at any time instant.

e.g.  x = 5      at t = 0
        x = 11    at t = 2 
and so on...

One important example of the motion signal is RADAR which displays the motion of any aircraft as an electromagnetic signal.


Sound signal

When any medium (ex. air) vibrates it produces sound.
Sound signal Associates a pressure value to every value of time and space coordinates.


Image signal

Do you know that image is also a signal !!! 
An image or a picture has a color or brightness signal; a function of two dimensional location. Any object's appearance is represented as a reflected or emitted electromagnetic wave which is a type of electronic signal.
So any image has two components-
Color and brightness


Video signal

A video signal is just a sequence of images. A Point in a video can be identified as its two dimensional position and time of its occurrence. This makes the video a three-dimensional entity having two dimensional position and time as the third dimension.

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