A variation of the linear phase approximation technique

The approximation technique, presented in previous letters, is extended. The approximation polynomial is, again, of the form P
n
(s) = M(s) + kN(s). The method of optimization of constant k is considered, and it is shown that an equal percentage ripple approximation can be achieved by a very simple procedure. The technique is particularly useful when a time delay network consists of a number of sections in tandem.