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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:

  • Dsp029 - Provides a visual illustration of the impact of the sampling frequency and the Nyquist folding frequency.
  • Dsp028 - Driver program for doing spectral analysis using a DFT algorithm.
  • ForwardRealToComplex01 - Class that implements the DFT algorithm.
  • Dsp030 - Driver program for doing spectral analysis using an FFT algorithm.
  • ForwardRealToComplexFFT01 - Class that implements the FFT algorithm (will defer explanation until a future module).
  • Graph03 - Used to display results of spectral analysis. (The concepts were explained in the earlier module titled Plotting Engineering and Scientific Data using Java .)
  • Graph06 - Used to display the impact of sampling frequency and the Nyquist folding frequency. Also used to display the results of spectralanalysis. (The concepts were explained in the earlier module titled Plotting Engineering and Scientific Data using Java .)

Discussion and sample code

This will be a long module involving lots of code and lots of explanations, so fill your cup with java and let's get started.

Sampling frequency and the Nyquist folding frequency

I will begin the discussion with the program named Dsp029 , which provides a visual illustration of the impact of the sampling frequency andthe Nyquist folding frequency. A complete listing of this program is shown in Listing 16 near the end of the module.

Display sinusoids

This program generates and displays up to five sinusoids having the same sampling frequency but having different sinusoidal frequencies and amplitudes.The program provides a visual illustration of the way in which frequencies above one-half the sampling frequency fold back into the area bounded by zero andone-half the sampling frequency.

(The frequency at one-half the sampling frequency is known as the Nyquist folding frequency.)

Input parameters

The program gets its input parameters from a file named Dsp029.txt . If that file doesn't exist in the current directory, the program uses a set ofdefault parameters.

Each parameter value must be stored as characters on a separate line in the file named Dsp029.txt . The required parameters are shown in Figure 1 .

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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