Types of signals , Energy And Power Signal

Types Of Signals

A signal is a function representing a physical quantity or variable, and typically itcontains information about the behavior or nature of the phenomenon.

Signals are of following types-

• Continuous and Discrete time signal
• Analog and Digital signal
• Even and Odd signal 
• Perodic or Non Perodic Signal 
• Energy and Power Signal 
• Determinestic and Random Signal 

Difference Between Energy And Power signal 

For an arbitrary continuous-time signal x(t),

the normalized energy content E of x(t) is defined as

The normalized average power P of x(t) is defined as

for a discrete-time signal x[n],

the normalized energy content E of x[n] is defined as

The normalized average power P of x[n] is defined as

Note it -

1. x(t) (or x[n]) is said to be an energy signal (or sequence) if and only if 0 < E < m, and so P = 0.
2. x(t) (or x[n]) is said to be a power signal (or sequence) if and only if 0 < P < m, thus implying that E = m.

Signals that satisfy neither property are referred to as neither energy signals nor power signals.