M. Yaseen, THE OPTIMAL AND STRAIGHTFORWARD DESIGN OF BANDPASS WAVE DIGITAL LATTICE FILTERS WITH ARBITRARY LOSS SPECIFICATIONS, International journal of circuit theory and applications, 25(3), 1997, pp. 209-218
An efficient, simple and reliable design method is introduced for band
pass wave digital lattice filters exhibiting arbitrary loss responses.
The main feature of this method is that the approximation is straight
forward. Thus it is carried out without the need to apply frequency tr
ansformation techniques. The method relies on employing the relationsh
ip between the amplitude and the two branch phase functions of the fil
ter. As a consequence, the whole problem reduces finally to constructi
ng a polynomial specified by its phase. The generation of this polynom
ial is achieved through the use of interpolation recurrence formulae.
By factorizing this polynomial into its Hurwitz and non-Hurwitz parts,
the two branch allpass functions are determined and realized. (C) 199
7 by John Wiley & Sons, Ltd.