Linear phase analog filter design with arbitrary stopband zeros

The authors describe current progress on a computer design method for filters that simultaneously approximates passband flat delay as well as equiripple amplitude response and stopband attenuation requirements. The delay variation has been found to be less than that of comparable designs of the same order using the standard method of separately deriving the transfer functions for the desired amplitude response and the all-pass delay equalizer. Total delay, or transit time, of the signal is also significantly less in the new approach