Transitional filters based on the classical polynomial approximations

This paper proposes a design methodology for transitional low-pass filters using six classical approximations of polynomial filters. The design is achieved taking into account a prescribed specification, leading to a better trade-off among the magnitude, phase and/or time responses. With this approach it is possible to design filters that have an improved performance than those designed with classical polynomial approximations or some other transitional filters proposed in the literature. An example demonstrating the results and effectiveness of our proposal is presented