TABLE OF CONTENTS WFilter is an analog and digital filter design package for Windows. To install WFilter on your computer, simply run the SETUP.EXE file in the \WFILTER directory on the accompanying CD.
WFilter determines the transfer function coefficients necessary for analog filters, and for digital FIR and IIR filters. The user is allowed to make choices of lowpass, highpass, bandpass, or bandstop filters for frequency selectivity as well as choices of approximation. For digital IIR and analog filters, the approximation choices are Butterworth, Chebyshev, inverse Chebyshev, and elliptic. For digital FIR filters, the rectangular, Barlett, Blackman, Hamming, von Hann, and Kaiser windows are available, as well as the Parks-McClellan optimization technique. The order of FIR filters based on design specifications cannot be predicted as accurately as for IIR and analog filters, therefore the user is given the option of changing the filter length during the design process.
After the filter has been designed, the user can view the pole-zero plot, as well as the magnitude and phase frequency responses. The filter design parameters or the frequency response parameters can also be edited for ease of use. Filter parameters can be saved and printed, and all plots can be printed or included in other documents by copying to the clipboard.
In addition, for analog filters, the Spice circuit file can be generated to aid in the analysis of active filters. After WFilter generated the file, it can be saved or printed. Digital filters may be used to filter wave...
