X. Zhang et H. Iwakura, EQUIRIPPLE DESIGN OF QMF BANKS USING DIGITAL ALLPASS NETWORKS, IEICE transactions on fundamentals of electronics, communications and computer science, E78A(8), 1995, pp. 1010-1016
Citations number
NO
Categorie Soggetti
Engineering, Eletrical & Electronic","Computer Science Hardware & Architecture","Computer Science Information Systems
In this paper, we discuss design of quadrature mirror filter (QMF) ban
ks using digital allpass networks in the frequency domain. In the QMF
banks composed of a parallel connection of two allpass networks, both
aliasing error and amplitude distortion are always completely canceled
. Therefore, we only need to design the analysis filters and eliminate
phase distortion of the overall transfer function. We consider design
of the QMF banks in two cases where phase responses of the filters ar
e required or not required. In the case where the phase responses are
not required, the design problem can be reduced to design of phase dif
ference of two allpass networks. In the case where the phase responses
are required, we present a procedure for designing the QMF banks with
both equiripple magnitude and phase responses.