DESIGN OF M-CHANNEL PERFECT RECONSTRUCTION FILTERBANKS WITH IIR-FIR HYBRID BUILDING BLOCKS

This paper discusses a new structure of M-channel IIR per-fect reconstruction filterbanks. A novel design implementa-tion for the new building block defined as a product of an IIR building block and an FIR building block is presented. The IIR building blocks are written by state space represen-tation, in which we can easily obtain a stability of the filter-bank by placing its eigen values inside the unit circle. Due to cascading of building blocks, we can get more free pa-rameters. We introduce the condition how we obtain the new building blocks without increasing of the filter order. Addi-tionally, by showing the simulation results, we show that our proposed FBs have better stopband attenuation than a con-ventional method