Subband filtering: Cordic modulation and systolic quadrature mirror filter tree

The decomposition (analysis) of a finite-energy signal into a relatively small number of mutually independent signals which allows reconstruction (synthesis) of the original signal is called subband filtering. Subbands can be processed in parallel or recursively. In the latter case, one obtains a so-called quadrature mirror filter tree. The former case leads to cosine-modulated filter banks. The authors present a Cordic based cosine-modulated bank and a systolic algorithm for quadrature mirror tree filtering