多级半带滤波器的FPGA实现,采用6级滤波器实现的采样频率由3200Hz降为50Hz的抽取系统，前5级为半带滤波器,最后一级为普通FIR滤波器-Multi-level half-band filter FPGA, using six filters for sampling frequencies 50Hz down to 3200Hz extraction system for the front five and a half-band filter, the last stage of