Optimum Filters with Monotonic Response
Athanasios Papoulis · Proceedings of the IRE · 1958
A class of filters is developed whose amplitude characteristic has no ripple in the pass band and a high rate of attenuation in the stop band; thus it combines the desirable features of the Butterworth and Tchebycheff response. Among all filters of a given order this new class has the maximum cutoff rate under the condition of a monotonically decreasing response.