IIR multiple notch filter design based on allpass filter

摘要

A new technique for IIR multiple notch filter design is proposed.nThe specification of notch filter is first transformed into that ofnallpass filter. Then, we develop an effective approach to design thisndesired allpass filter. The realization of proposed notch filter isnequivalent to the realization of an allpass filter. Due to thenmirror-image symmetry relation between the numerator and denominatornpolynomials of allpass filter, the notch filter can be realized by ancomputationally efficient lattice structure with very low sensitivity.nMoreover, some examples are presented to examine the effectiveness ofnproposed method