Communications | Digital Signal Processing (DSP) | Radio Propagation k

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Digital Filter Design in Capsim

Capsim has built in interactive digital filter design capabilities. These include FIR Filter Design using the Window Method. The interactive Computer Aided Design(CAD) of FIR filters using the Parks-McClellan algorithm. Capsim supports the design of IIR digital filters. The IIR filter design package also includes the capability for interactive pole zero design. You can design IIR filters from scratch or tune existing designs or designs based on Capsim's IIR filter design package. All filter designs can be used in block diagram simulations for verification of performance and specifications.

All the capabilities highlighted in the audio visual tutorials and overview are included with the purchase of Capsim including built in filter design blocks and fixed point modeling. Capsim provides source code (see open source Text Mode Capsim) for its filter design capabilities including the fixed point normalized lattice filter for implementing the most demanding specifications for IIR filters.

Digital Filter Design AV Material
Item
Description Format Panels
View
1
FIR Filter Design (Window Method and Parks-McClellan CAD) On-Line Flash FIR CAD
2
IIR Filter Design, Pole Zero Interactive Design and Analysis On-Line Flash  
3
Fixed Point Modeling On-Line Flash

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FIR Filter Design

 

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IIR Filter Design

 

Supported Platforms Top

  • Linux 32 bit and 64 bit

FIR Window Method

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Screen Shot

Filter Types:

  • Low Pass
  • High Pass
  • Band Pass
  • High Pass
Windows:
  • Rectangular
  • Triangular
  • Hamming
  • Generalized Hamming
  • Hanning
  • Chebyshev
  • Kaiser
  • Parszen
Plots:
  • Frequency Response
  • Impulse Response
  • Phase Response
  • Group Delay

The structures can be used as parameters to Capsim FIR filter blocks to simulate the filter using various excitations or directly in communications and signal processing systems.

 

FIR CAD

Capsim uses the Parks-McClellan Algorithm for FIR CAD. See PDF Overview and screen shot.

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IIR Filter Design

Screen Shot

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Filter Types:

  • Low Pass
  • High Pass
  • Band Pass
  • High Pass
Methods:
  • Butterworth
  • Chebychev
  • Elliptic
Plots:
  • Frequency Response
  • Impulse Response
  • Group Delay
  • Pole-Zero Plot ( Also tied to Pole-Zero CAD Tool)
Structures:
  • Cascade
  • Direct Form
  • Normalized Lattice

The structures can be used as parameters to Capsim IIR filter blocks to simulate the filter using various excitations or directly in communications and signal processing systems.

 

Pole-Zero Interactive Filter Design

The pole-zero design and simulation system provides for interactive design and simulation of IIR filters. Users can place poles or zeroes and calculate the frequency and impulse response along with group delay and phase response. Users can move poles or zeroes and immediately see the effect on the frequency (magnitude and group delay) or impulse response. Poles or zeroes can be added or deleted. The pole-zero design and simulation system can also be used to modify IIR filers designed by the IIR Filter design system in Capsim. Click on the screen shot below. Also see this screen shot.

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