8/14/2019 ANALOG COMMUNICATION Lecture 02

1/49

Introduction to Signals

Lecture 02

Mansoor Khan

EEE352 Analog Communication Systems

8/14/2019 ANALOG COMMUNICATION Lecture 02

2/49

Signals

A signal is a set of information or data.

Examples

a telephone or television signal,

monthly sales of a corporation,

the daily closing prices of a stock market

We deal exclusively with signals that are functions

of time.

8/14/2019 ANALOG COMMUNICATION Lecture 02

3/49

01/10/2009 EEE 352 3

Speech Signal

8/14/2019 ANALOG COMMUNICATION Lecture 02

4/49

Energy of Signals

The signal energy Eg ofg(t) is defined (for a

real signal) as

In the case of a complex valued signal g(t), the

energy is given by

8/14/2019 ANALOG COMMUNICATION Lecture 02

5/49

8/14/2019 ANALOG COMMUNICATION Lecture 02

6/49

Energy Signals

A signal g(t) is an energy signal ifEg