F. Argenti et al., DESIGN OF IIR LINEAR-PHASE QMF BANKS BASED ON COMPLEX ALLPASS SECTIONS, IEEE transactions on signal processing, 44(5), 1996, pp. 1262-1267
A new method for the design of two-channel, perfect reconstruction, an
alysis/synthesis QMF banks is presented, The filters of the banks are
IIR, power complementary, linear phase, and are represented by means o
f complex allpass functions, Design procedures based both on numerical
approximation and on a flatness constraint imposed on the frequency r
esponses of the filters are given.