Eigenfilter design of real and complex coefficient prototypes for uniform and nonuniform filter banks

In this study we propose a new method to design pseudo-QMF prototype filters to implement near perfect reconstruction (NPR) cosine-modulated filter banks. The method is based on the eigenfilter approach, that is simple to implement, but, nevertheless, is very efficient in designing high attenuation prototype filters. The method also allows to design complex coefficient prototypes that can be used to build nonuniform filter banks. The effectiveness of the method is demonstrated by means of some examples of design of both uniform and nonuniform filter banks.