A new design methodology for window-based FIR filters

This letter describes a novel window-based approach to FIR filter de-sign. The window is constructed on the use of equispaced Gaussian basis functions. Unlike other known window-based methods that do not allow for a satisfactory degree of control over band edges, the proposed method affords very good solution for controlling critical frequencies. In addition, the proposed window method is easier to implement than Kaiser’s and affords a better passband flatness than any known design approach. It also yields stopband attenuations and control of critical frequencies which turn out to be very close to those obtainable with Parks– McClellan’s method. So the proposed GBR window approach appears to be a significant step forward.