ANALOG SIGNAL An introduction

Analog Signal In previous slides I try to give you the

concept of signal know its time to move on.

Signal has two types. Analog signal. Digital signal.

Analog signal are those signal that changes them selves continuously.

Lets have an example

Example

Labeling the graph as temperature of month

Explanation You can see that the graph is analogous. Each and every point can be found. You can say that the analog signal is the

signal which can take any value in the given limit.

In the given example the limit is from 0 to 47

As we are learning digital circuits so change the given example into voltage. i.e. change temperature at y axis to voltage v.

Lets have a look.

After change

Discreet time signal The signal which is defined for the

discreet interval of time. It is a subset of analog signal. Lets understand it with an example. Lets we have to measure the

temperature at 11 am daily. So lets make a graph for it. Have a look.

Graph

Explanation It is the old one but I take it as example . Know you can see it clearly the

temperature of different days at 11 am. We do not know about the temperature

between 11 am of day 1 and day 2. So this value of temperature between

these two days is not available to us. If we remove these parts off all days then

the graph will be as

Point to remember These signals are actually analog. The difference is of measuring we are not

measuring the temperature of whole day. If we join all points the graph shows that

it is analog. That is why it is called subset of analog. All real life signals are analog signals. I hope you understand all this.

Allah HafizBest of luck