The invention proposes a digital filter adapted to transform an input digital signal into two output digital signals. The input digital signal includes input samples (xi). The first output digital signal includes output samples (y2i1) of odd ranking, each equal to the input sample (x2i) of the same ranking...http://www.google.com.au/patents/US6507613?utm_source=gb-gplus-sharePatent US6507613 - Digital Filters and corresponding filtering methods
