Eigenfilter design of real and complex coefficient QMF prototypes

In this brief we propose a new method to design pseudo-QMF prototypes to im plement near perfect reconstruction (NPR) modulated filter banks. The propo sed method is based on the eigenfilter approach, simple to implement, but n evertheless, very efficient in designing high attenuation filters. The meth od also allows to design complex coefficient prototypes that may be used to build nonuniform filter banks. Several examples of both uniform and nonuni form filter bank design are presented.