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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

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
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John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
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emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
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Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
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Muhammad Reply
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Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir 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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