Family of equiripple lowpass digital filters
Anthony George Constantinides · Electronics Letters · 1970
The letter deals with the special case of general-parameter filters that yield Cheby̅shev characteristics. The solution gives a family of Cheby̅shev responses with monotonic stopband and equiripple passband characteristics. These characteristics belong to combinations of the sin (ωT/2) and tan (ωT/2) formulations and it is shown that under the condition of maximum sharpness at cutoff the tan (ωT/2) formulation is unique.