Filter Design Software

Systolix Limitedon 4.0 of the free digital filter design software, FilterExpress, has been released, with an added companion simulator called FilterSim. The Windows-based tools provide electronic and communications systems designers with a means of developing and evaluating DSP-based filters of almost any kind - including processor efficient multi-rate designs.

The software 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. The numeric precision of the tools is user-programmable to allow filter designs to be optimized 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.

The latest release of the software 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.

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