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Different analog and digital signal:

Analog signal :

(i) Unit step signal:

(ii) Unit ramp signal:

The unit ramp signal is defined as,

(iii) Unit impulse signal :
The impulse signal is a signal with infinite magnitude and zero duration, but with the unit area. The unit impulse function is also known as the Dirac delta function.

(iv) Exponential signal :
Exponential signals are of two types :

(a) Real exponential signal:

(b) Complex exponential signal:

The real part of the complex frequency variable is called attenuation or growth constant. It denotes how much amount of amplitude of the signal is increased or decreased. The imaginary part of a complex frequency variable is called angular frequency with a usual meaning.

Digital signal:

(i) Unit step sequence :

The unit step sequence is mathematically defined as,

(ii) Unit ramp sequence :

Unit ramp sequence is defined as,

(iii) Unit sample sequence :
Unit sample sequence is defined as,

(iv) Exponential sequence :
Exponential sequences are of two types :
(a) Real exponential sequence :

(b) Complex exponential sequence :

(v) Rectangular pulse sequence :

Let L be a positive odd integer. An important example of a discrete-time signal is the discrete-time rectangular pulse function rect[n ] of length L defined by,