Generalized doubly complementary IIR digital filters (Q1196240)

The authors examine the properties of weighted complementary IIR filters. Either real or complex allpass subfilters are utilized. The classical odd-order lowpass designs can be realized as a parallel connection of two real or complex conjugate allpass filters. Also, a complementary filter pair can be implemented at the cost of a single filter. This work generalizes these concepts to weighted complementary filter pairs. Some applications of these concepts including multilevel designs, amplitude equalizers and weighted cascaded designs are given.