In this paper, the high decimation ratio of digital down converter is studied and the multi-stage decimation algorithm is especially analyzed based on CIC filter, CFIR filter and RRC filter.
A new parallel FIR filter based on the iterated short-convolution algorithms (ISCA) is designed with the structure of multi-stage small size parallel sub FIR filters.
Ultimately, selection of the optimum filters depends on flow rate, particle removal efficiency of the filter, filtration scheme (single vs. multi-stage filtration), and filter service life.