On power-complementary FIR filters
Palghat P. Vaidyanathan · IEEE Transactions on Circuits and Systems · 1985
Conditions are derived, under which two linear-phase FIR filter transfer functionsH(z)andG(z)have the power-complementary property, i.e.,|H(e^{j \omega})|^{2} + |G(e^{j\omega})|^{2} = 1. It is shown that, the constraint of linear phase on the transfer functions strongly restricts the class of frequency responses that can be realized by a power-complementary pair.