A software package for the analysis and design of digital filters

A Windows-based software package that can be used to analyze, design, and realize digital filters, referred to as D-Filter, is described. The program can analyze recursive and nonrecursive filters in the time and frequency domains, it implements most of the classical design methods such as the Fourier series and window methods for nonrecursive filters and the bilinear transformation method for recursive filters, and includes modules that can be used to study the effects of coefficient and product quantization. Synthesis can be accomplished through realization methods that range from the cascade canonic to the wave lattice realization. The program is highly modular, includes a good graphic capability, and saves data in terms of certain standard data structures at every stage of the design process. In consequence, specific processes can be repeated and checked any number of times until the designer is happy with the results.