Date post: | 15-Apr-2017 |
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Education |
Upload: | sajjad-mehmood |
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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