Chebyshev delay approximation of even degree with constraint at the origin
Vidosav Stojanović, M. Radmanovic · Electronics Letters · 1978
A special case of Chebyshev approximation of a constant group delay, referred to as the constrained Chebyshev delay approximation at the origin, recently introduced for low-pass filter functions of odd degree, is extended to allow for determination of the transfer function of even degree.