On the linear phase approximation

A simple technique for linear phase approximation is illustrated. The approximation polynomial used is of the form Pn(s) = M(s) + kN(s), where M(s) and N(s) are even and odd polynomials with interlaced, and equally spaced, imaginary zeros. The influence of constant k is investigated, and it is shown that a proper selection of that constant leads to good approximation.