Sc. Pei et Cc. Tseng, IIR MULTIPLE NOTCH FILTER DESIGN BASED ON ALLPASS FILTER, IEEE transactions on circuits and systems. 2, Analog and digital signal processing, 44(2), 1997, pp. 133-136
In this brief, a new technique for IIR multiple notch filter design is
proposed, The specification of notch filter is first transformed into
that of allpass filter. Then, we develop an effective approach to des
ign this desired allpass filter, The realization of proposed notch fil
ter is equivalent to the realization of an allpass filter. Due to the
mirror-image symmetry relation between the numerator and denominator p
olynomials of allpass filter, the notch filter can be realized by a co
mputationally efficient lattice structure with very low sensitivity, M
oreover, some examples are presented to examine the effectiveness of p
roposed method.