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Question and comments

Questions or comments concerning this laboratory should be directedto Prof. Charles A. Bouman, School of Electrical and Computer Engineering, Purdue University, West Lafayette IN 47907;(765) 494-0340; bouman@ecn.purdue.edu

Introduction

The purpose of this lab is to illustrate the properties of continuous and discrete-time signals using digital computersand the Matlab software environment. A continuous-time signal takes on a value at every pointin time, whereas a discrete-time signal is only defined at integer values of the “time” variable.However, while discrete-time signals can be easily stored and processed on a computer,it is impossible to store the values of a continuous-time signal for all points along a segment of the real line.In later labs, we will see that digital computers are actuallyrestricted to the storage of quantized discrete-time signals. Such signals are appropriately known as digital signals.

How then do we process continuous-time signals? In this lab, we will show that continuous-time signalsmay be processed by first approximating them by discrete-time signals using a process knownas sampling. We will see that proper selectionof the spacing between samples is crucial for an efficient and accurate approximationof a continuous-time signal. Excessively close spacing will lead to too much data,whereas excessively distant spacing will lead to a poor approximation of the continuous-time signal.Sampling will be an important topic in future labs, but for now we will use sampling to approximatelycompute some simple attributes of both real and synthetic signals.

Be sure to read the guidelines for the written reports.

Matlab review

Practically all lab tasks in the ECE438 lab will be performed using Matlab. Matlab (MATrix LABoratory) is a technical computing environmentfor numerical analysis, matrix computation, signal processing, and graphics.In this section, we will review some of its basic functions. For a short tutorial and some Matlab examples click here .

Starting matlab and getting help

You can start Matlab (version 7.0) on your workstation by typing the command

matlab

in a command window. After starting up, you will get a Matlab window.To get help on any specific command, such as “plot”, you can type the following

help plot

in the “Command Window” portion of the Matlab window. You can do a keyword search for commands related to a topic by using thefollowing.

lookfor topic

You can get an interactive help window using the function

helpdesk

or by following the Help menu near the top of the window.

Matrices and operations

Every element in Matlab is a matrix. So, for example, the Matlab command

a = [ 1 2 3 ]

creates a matrix named “ a ” with dimensions of 1 × 3 . The variable “ a ” is stored in what is called the Matlab workspace. The operation

b = a .'

stores the transpose of “ a ” into the vector “ b ”. In this case, “ b ” is a 3 × 1 vector.

Since each element in Matlab is a matrix, the operation

c = a * b

computes the matrix product of “ a ” and “ b ” to generate a scalarvalue for “ c ” of 14 = 1 * 1 + 2 * 2 + 3 * 3 .

Questions & Answers

how can chip be made from sand
Eke Reply
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Purdue digital signal processing labs (ece 438). OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col10593/1.4
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