The FDSZ program

The FDSZ program designs continuous-time and discrete-time filters (IIR), using several classical approximations. It also allows a generalized design procedure that can generate filters in a continuous range from the Butterworth to the Cauer approximations.

Discrete-time (digital) filters can be obtained from continuous-time approximations by the bilinear or LDI transformations. The program can also design a biquad cascade filter from the approximations. For digital filters, it computes also the multiplier values for a particular low-sensitivity structure.

The program was developed as a tool for the study of approximations for filters, and to generate digital filters to be used for the off-line processing of signal samples (the filtering program AnaWave is available below).

The use of the FDSZ program is free for academic or educational purposes.

Select a version to download below:

The files are compressed in the "zip" format.

• FDSZ, Windows version.
• AnaWave. Analyzes wave audio files and filters signals using the filters designed by the FDSZ program. Windows version. Signal generator WaveMake included.
• FDSZ, DOS version 1.0f (old).
• FDSZ, Sun Unix version 1.0a (old).
• FDSZ, Linux version 1.0d. Requires X11 and XView (old).
• AnaWave. DOS version (old).

Last update: 21/7/2019.
Developed and Maintained by Antonio Carlos M. de Queiroz