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Getting started

To start a design, you first choose from one of the two available interactive design tools by making a selectionfrom the tree control on the left side of the interface. Select Classical Design to design a filter based on specifications such aspassband / stopband edge frequencies, passband ripple, and stopband attenuation. Select Pole-Zero Placement to design a filter byspecifying the locations of poles and zeros on the complex plane.

The following sections detail how to work with each alternative.

Classical filter design

This tool allows you to design multiple digital filter types by adjusting the filter specifications manually orby interactively changing the passband and stopband cursors in the magnitude vs. frequency graph. As the cursors move, the pole/zero plot and the text based interface change dynamically toset the values for the desired filter.

Digital filter design utility

The Classical Filter Design Interface

Classical filter parameter descriptions

  • Filter Type: Specifies the type of filter you want. The default is a lowpass filter type. You also can select a highpass,bandpass, or bandstop filter type.

Filter specification

  • Sampling Frequency [Hz]: Specifies the sampling frequency ofthe filter in hertz
  • Passband Edge Frequency [Hz]: Specifies the first passband edge frequency of the filter in hertz.
  • Passband Edge Frequency [Hz]: Specifies the second passband edge frequency of the filter in hertz. This option does not appearfor lowpass or highpass filters.
  • Passband Ripple: Specifies the passband ripple of the filter in units determined by the Magnitude in dB option.
  • Stopband Edge Frequency [Hz]: Specifies the first stopband edge frequency of the filter in hertz.
  • Stopband Edge Frequency [Hz]: Specifies the second stopband edge frequency of the filter in hertz. This option does not appearfor lowpass or highpass filters.
  • Stopband Attenuation: Specifies the stopband attenuation of the filter in units determined by the Magnitude in dBoption.
  • Design Method: Specifies the method of filter design. The default is Elliptic. You also can select Butterworth, Chebyshev,Inverse Chebyshev, Kaiser Window, Dolph Chebyshev Window, and Equi Ripple FIR filter designs. Elliptic, Butterworth, Chebyshev, andInverse Chebyshev designs are IIR filter designs. Kaiser Window, Dolph Chebyshev Window, and Equi Ripple FIR designs are FIR filterdesigns.

Design feedback

  • Filter Order: Returns the order of the designed filter. For FIR filters, order +1 equals the number of coefficients or filtertaps.
  • Error Message: Contains details about errors that occur during filter creation.
  • Magnitude in dB: Specifies whether the VI uses decibels or a linear scale to express the magnitude response and for entry of the Passband and Stopband Attenuation input parameters. If checked, the VI converts linear magnitude response to decibels.
  • Passband: Specifies the color of the lines in the magnitude plot that represent the passband response and the passbandfrequencies. The default is blue. Click the color box next to the parameter name to select a different color.
  • Stopband: Specifies the color of the lines in the magnitude plot that represent the stopband attenuation and the stopbandfrequencies. The default is red. Click the color box next to the parameter name to select a different color.
  • Magnitude: Contains the plot of the magnitude response. You can drag the cursors in the plot to change the specifications. Thecolor you specify in passband represents the passband response and the passband frequencies. The color you specify in stopbandrepresents the stopband attenuation and the stopband frequencies. The green vertical line in the graph represents the half samplingfrequency, also known as the Nyquist frequency.
  • Z Plane: Contains the plot of the zeroes and poles of the filter in the Z plane.

Questions & Answers

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
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
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
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
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Fundamentals of digital signal processing lab. OpenStax CNX. Jan 03, 2006 Download for free at http://cnx.org/content/col10303/1.5
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