Product category:
Design and Development Software
News Release from: Systolix | Subject: FilterExpress V4.0
Edited by the Electronicstalk Editorial
Team on 09 January 2001
Free filter design software includes
simulator
Systolix has released version 4.0 of its free digital filter design software, FilterExpress, and has added a companion simulator called FilterSim.
Systolix has released version 4.0 of its free digital filter design software, FilterExpress, and has added a companion simulator called FilterSim The Windows-based tools provide electronics and communications systems designers with an extremely rapid means of developing and evaluating DSP-based filters of almost any kind - including processor efficient multi-rate designs
This article was originally published on Electronicstalk on 16 Jan 2006 at 8.00am (UK)
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The professional quality software is highly intuitive to use.
FilterExpress allows designers to create most common filter configurations in minutes.
Designs may then be simulated with FilterSim using built-in signal generator facilities or a user's own test data.
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The numeric precision of the tools is user-programmable to allow filter designs to be optimised for the target DSP hardware.
When satisfied with the results, the filter's coefficients may be saved in ASCII format for import into a user's DSP development software.
Systolix's FilterExpress makes the process of specifying and designing digital filters as painless as possible via a user interface which allows the direct entry of filter specifications using just one screen, instead of the pages of forms employed by some tools.
This specification process can be performed in seconds if required, as FilterExpress will automatically apply intelligent default values to give users 'instant' graphical feedback on results which may then be optimised iteratively.
The latest release of FilterExpress adds support for more filter types which now include: low/high pass and band pass/stop filters; Butterworth, Chebychev, equiripple, half band and elliptic IIR (infinite impulse response) filters; Kaiser, Blackman, Von Hann, Hamming and rectangular FIR (finite impulse response) filters; pulse-shaping filters of various forms; and Hilbert Transforms.
The tool supports both single- and multi-rate designs including mixed FIR/IIR multi-rate filters - a unique feature for free engineering software of this kind.
This allows users to create cascaded solutions with stages running at different sampling rates, to decimate or interpolate data and build much more compact and economic filtering solutions.
The new simulator, FilterSim v1.0, has been added as a result of the popularity of FilterExpress - which has attracted thousands of registered users since its launch.
Systolix's FilterSim is designed to work from FilterExpress data and enables the time domain simulation of networks of digital filters.
Networks of IIR and FIR filters may be built using a wizard, or graphically using icons.
Simulation results can be viewed graphically and, additionally, may be analysed using standard functions such as FFTs, or analysis wizards for common functions such as signal-to-noise ratio and total harmonic distortion.
FilterExpress and FilterSim are stand-alone versions of tools from Systolix's development system for devices employing the PulseDSP architecture, but are generic and do not limit the designer to any particular target technology.
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