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Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.

Figures

  • Figure 1. Five pulses in the time domain.
  • Figure 2. Spectral analyses of five pulses.
  • Figure 3. Expanded spectral analyses of five pulses.
  • Figure 4. Five pulses with two sinusoids each.
  • Figure 5. Spectral analyses of five pulses.
  • Figure 6. Five pulses with additive sinusoids.
  • Figure 7. Spectral analyses of five pulses.
  • Figure 8. Expanded spectral analyses of five pulses.

Listings

Preview

Before I get into the technical details, here is a preview of the programs and their purposes that I will present and explain in this module:

  • Dsp031 - Illustrates frequency resolution versus pulse length for pulses consisting of a truncated single sinusoid.
  • Dsp031a - Displays the pulses analyzed by Dsp031.
  • Dsp032 - Illustrates frequency resolution versus pulse length for pulses consisting of the sum of two truncated sinusoids with closely spacedfrequencies.
  • Dsp032a - Displays the pulses analyzed by Dsp032.
  • Dsp033 - Illustrates frequency resolution versus pulse length for pulses consisting of the sum of two truncated sinusoids whose frequencies arebarely resolvable.
  • Dsp033a - Displays the pulses analyzed by Dsp033.

In addition, I will use the following programs that I explained in the module titled Spectrum Analysis using Java, Sampling Frequency, Folding Frequency, and the FFTAlgorithm .

  • ForwardRealToComplex01 - Class that implements the DFT algorithm for spectral analysis.
  • Graph03 - Used to display various types of data. (The concepts were explained in an earlier module.)
  • Graph06 - Also used to display various types of data in a somewhat different format. (The concepts were also explained in an earlier module.)

Discussion and sample code

Five pulses in the time domain

Let's begin by looking at the time series data that will be used as input to the first spectral analysis experiment. Figure 1 shows five pulses in the time domain. Figure 2 and Figure 3 show the result of performing a spectral analysis on each of these pulses.

(The display in Figure 1 was produced by the program named Dsp031a, which I will explain later.)

Figure 1. Five pulses in the time domain.
missing image

The lengths of the pulses

If you examine Figure 1 carefully, you will see that each pulse is twice as long as the pulse above it. (There is a tick mark on the horizontal axes every twenty-five samples.) The bottom pulse is 400 samples long while the top pulse is 25 samples long.

Questions & Answers

anyone have book of Abdel Salam Hamdy Makhlouf book in pdf Fundamentals of Nanoparticles: Classifications, Synthesis
Naeem Reply
what happen with The nano material on The deep space.?
pedro Reply
It could change the whole space science.
puvananathan
the characteristics of nano materials can be studied by solving which equation?
sibaram Reply
plz answer fast
sibaram
synthesis of nano materials by chemical reaction taking place in aqueous solvents under high temperature and pressure is call?
sibaram
hydrothermal synthesis
ISHFAQ
how can chip be made from sand
Eke Reply
is this allso about nanoscale material
Almas
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 is the latest information on a no technology how can I find it
William
currently
William
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
STM - Scanning Tunneling Microscope.
puvananathan
How we are making nano material?
LITNING Reply
Some times this process occur naturally. if not, nano engineers build nano materials. they have different physical and chemical properties.
puvananathan
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Source:  OpenStax, Digital signal processing - dsp. OpenStax CNX. Jan 06, 2016 Download for free at https://legacy.cnx.org/content/col11642/1.38
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