Ba. Shenoi et P. Misra, DESIGN OF 2-DIMENSIONAL IIR DIGITAL-FILTERS WITH LINEAR-PHASE, IEEE transactions on circuits and systems. 2, Analog and digital signal processing, 42(2), 1995, pp. 124-129
Notice,Digital Spectral Transformation (DST) has been used to approxim
ate the magnitude response specifications of circular, elliptic and fa
n shaped filters, In this paper, it is shown that when the DST propose
d by Ham and Shenoi is applied to the 1-D lowpass prototype filters wi
th Linear phase characteristics to realize 2-D IIR filters, it preserv
es both magnitude and phase characteristics in the w(1)w(2) plane, Sev
eral attractive features of using this approach are discussed and simu
lation results are provided to illustrate its performance.