The introduction of the Signals is given. Basically the types of the signal introduced and in that first two types are discussed.

1. C O M P I L E D B Y : P R O F . G . B . R A T H O D
E M A I L :
G H A N S Y A M . R A T H O D @ B V M E N G I N E E R I N G . A C .
I N
Types of the signals

2. Classifications of the Signals
 Continuous and Discrete Time Signals
 Periodic and Non-Periodic Signals
 Deterministic and Random Signals
 Symmetrical and Anti-symmetrical signals
 Energy and Power Signals

3. Continuous Time Signals
 Signals are represented mathematically as functions
of one or more Independent variables.
 We take an example signal x which is in time
domain, we can show it x(t) as shown in figure.
For example, a speech signal can be
represented mathematically by acoustic
pressure as a function of time . Here in
this figure the sinusoidal signal is
represented.

4. Discrete Time Signal
 Discrete-time signals are defined only at discrete
times, and consequently, for these signals, the
independent variable takes on only a discrete set of
values.
From the figure, we can say the
value Of the signals we are getting
at specified Time only.

5. Periodic and Non-Periodic Signals
 A signal is said to be periodic if it is repeated over a
cycle of time or a regular interval of time. Consider a
function f(x) this can be called periodic only if it
satisfies the mathematical expression or condition as
shown below:
 f(x)= f(x+p) , here p is the periodicity of the signal.
 We will take one example for the better
understanding.

6. Periodic and Non-Periodic Signals
For this signal, f(x) = sin(x) and
the periodicity is p = 2π.
Lets check.
f(x+p) = sin(x+p)
f(x+ 2π)=sin(x+ 2π)=sin(x)
So its proven that after p the
signal is repeating
periodically.

7. Periodic and Non-Periodic Signals
Non-periodic signals,
whose frequency components
do change over time.
We can say here f(x)=f(x+p), p
is not fix so, it will change and
frequency is variable here in
this signal.
All the sound waves are non-
periodic. Chirp are non-periodic

8. To be continue
 Thank you