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Transcript
INTRODUCTION TO
SIGNALS & SYSTEMS
SIGNAL
A signal is a function of time representing a
physical variable, eg: voltage, current etc.
A signal is defined as a function of one or
more independent variables.
CLASSIFICATION OF SIGNALS
Signals are basically classified into two
different types as follows.


Continuous time signals
Discrete time signals
CT Signals
In continuous time signals the independent
variable is continuous, and they are defined
for a continuum of values
Example
DT Signal
Discrete time signals are defined only at
discrete times and for these signals the
independent variable takes on only a discrete
set of values
Example
Representation
To distinguish between continuous-time and
discrete time signals, we will use the symbol
‘t’ to denote the continuous time independent
variable and ‘n’ to denote the discrete time
independent variable.
Classifications of CT signals
The CT signals can be further classified into
the following
Unit step
Unit ramp
Exponentional
Impulse
Unit Step Signal
Ramp Signals
System
A system can be viewed as a
process in which input signals are
transformed by the system or
cause the system to respond in
some way resulting in other signals
as outputs.
CT system
DT system