Download - 209-Signals Systems and Networks
-
8/3/2019 209-Signals Systems and Networks
1/15
SIGNALS & SYSTEMSAn Introduction
Presented By:Loveleen Kaur
Asst. Professor
-
8/3/2019 209-Signals Systems and Networks
2/15
COURSE CODE:ECE209
TEXT BOOKS
Alexander, Sadiku Fundamentals of Electric Circuits, McGraw
Hill Publications, Latest Edition.
Other Specific Book:
Van Valkenberg, Network Analysis and Synthesis, PHI.
Shyammohan and Sudhakar, Circuits and Networks, Tata
McGraw Hill.
B. P. Lathi, Signal and Systems, Oxford,3e.
Phillips, Parr, Riskin ,Signals, Systems and Transforms, Pearson
Education
A. Chakrabarti,Circuit Theory, Dhanpat Rai & Co. 3rd / TMH,
2007
-
8/3/2019 209-Signals Systems and Networks
3/15
ABOUT THE SUBJECT
Signals
Systems
Transforms
Networks
-
8/3/2019 209-Signals Systems and Networks
4/15
To be transmitted, data mustbe transformed to
electromagnetic signals.
-
8/3/2019 209-Signals Systems and Networks
5/15
SIGNAL
-
8/3/2019 209-Signals Systems and Networks
6/15
SIGNAL It is the function that describes the variation of a physical
variable with respect to independent variable( time, space
etc.) in a physical process.
Mathematically,
S=f(x)
Where S is signal /function and x independent variable.
Examples:
1) Change in temperature sensed by the sensor placed in boiler.
T=f(t)
Here, time t is independent variable.
t (msec) 1 2 3 4
Temp(C) 29 51 18 50
-
8/3/2019 209-Signals Systems and Networks
7/15
ANALOG AND DIGITALANALOG AND DIGITAL
DataData cancan bebe analoganalog oror digitaldigital.. TheThe termterm analoganalog
datadata refersrefers toto informationinformation thatthat isis continuouscontinuous;;
digitaldigital datadata refersrefers toto informationinformation thatthat hashas discretediscretestatesstates.. AnalogAnalog datadata taketake onon continuouscontinuous valuesvalues..
DigitalDigital datadata taketake onon discretediscrete valuesvalues..
-
8/3/2019 209-Signals Systems and Networks
8/15
ANALOG AND DIGITAL DATA
Data can be analog or digital.
Analog data are continuous and take continuous values.
Digital data have discrete states and take discrete values.
-
8/3/2019 209-Signals Systems and Networks
9/15
ANALOG AND DIGITAL SIGNALS
Signals can be analog or digital.
Analog signals can have an infinite number of
values in a range.
Digital signals can have only a limitednumber of values.
-
8/3/2019 209-Signals Systems and Networks
10/15
COMPARISON OF ANALOG AND DIGITAL
SIGNALS
-
8/3/2019 209-Signals Systems and Networks
11/15
APPLICATION AREAS
Control
Communications
Signal Processing
-
8/3/2019 209-Signals Systems and Networks
12/15
CONTROL APPLICATIONS
Industrial control and automation (Control thevelocity or position of an object)
Examples:Controlling the position of a valve orshaft of a motor
Important Tools:
y Time-domain solution of differential equations
y Transfer function (Laplace Transform)
y Stability
-
8/3/2019 209-Signals Systems and Networks
13/15
COMMUNICATION APPLICATIONS
Transmission of information (signal) over a
channel
The channel may be free space, coaxial cable,
fiber optic cable Akey component of transmission: Modulation
(Analog and Digital Communication)
-
8/3/2019 209-Signals Systems and Networks
14/15
SIGNAL PROCESSING APPLICATIONS
Signal processing=Application ofalgorithms to modify signals in a way tomake them more useful.
Goals:y Efficient and reliable transmission, storage
and display of information
y Information extraction and enhancement
Examples
:
y Speech and audio processing
y Multimedia processing (image and video)
y Biological signal analysis
-
8/3/2019 209-Signals Systems and Networks
15/15
CLASSIFICATION OF SIGNALS
Continuous and Discrete time signals
Continuous valued and discrete valued signal
Periodic and non-periodic signals
Even and odd signals
Deterministic and random signals