How to complete paraunitary filter banks and simultaneously preserve linear phase?
Ying‐Jui Chen, K. Amaratunga · 2004
In this paper, the completion of linear-phase paraunitary filter banks (LPPUFBs) is presented. Given an M-band LPPUFB-admissible scaling filter H/sub 0/(z), the proposed method finds a complete parameterization such that the resulting M - 1 bandpass/highpass filters Hi(z) and the given filter Ho(z) form an LPPUFB. Results from completion of a general PUFB are used in combination with the LP-generating dyadic-based structure, so that the scaling filter H/sub 0/(z) of the resulting LPPUFB is as prescribed, and linear phase of the filter bank is guaranteed. The design procedure is demonstrated by an example.