Sine-cosine squared-magnitude function for maximally flat digital bandpass filters with adjustable skirt selectivities
P. Thajchayapong, F. Cheevasuvit · Electronics Letters · 1979
A sine-cosine squared-magnitude function for a digital bandpass filter is proposed. It offers a maximally flat passband magnitude response and more flexibility on the number of exchangeable zeros at ωT = 0 and ωT = π rad.