In previous slides I try to give you the concept
of signal know its time to move on.
Signal has two types.
Analog signal are those signal that changes
them selves continuously.
Lets have an example
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.
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
So lets make a graph for it.
Have a look.
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
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
That is why it is called subset of analog.
All real life signals are analog signals.
I hope you understand all this.