Implementation of DFT Filter Banks Based on FPGA

摘要

This paper main around the polyphase structure of filter bank to design. First introduce the theory and the basic structure of multi-sampling. Utilize these can improve the original structure of the filter bank, obtained the corresponding polyphase filter structure. This structure has greatly improved the speed of the filtering computing. Then use FIR filters to realize filtering part, and introduced using FIR filters direct structure to achieve filter's hardware realization. And also introduced using FPGA to achieve a time selected by the base structure of 2-FFT algorithm, on this basis, to achieve the the computing of IFFT. Then according to the relationship between synthesis bank and analysis bank in overall structure of approximate reconstruction filter banks, synthesis filter banks can be designed to achieve approximate reconstruction of the signal. Finally, system commissioning test and experimental results verify the correctness and feasibility of the program.