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通过分割查找表,并利用FIR线性滤波器的对称性改进并行分布式算法,以减小查找表的规模,采用Kaiser窗设计了一种18阶低通FIR数字滤波器。应用Verilog-HDL完成各个功能模块和整个滤波器系统的设计。采用Quartus II软件对顶层模块进行综合与仿真,结果显示所设计的FIR低通滤波器的最小阻带衰减AS=-30d B,带内波动<1d B,截止频率ωωc=0.4π,且过渡带△ω=0.2π。利用Matlab对仿真结果进行分析,验证所设计的FIR数字滤波器功能完全正确。
By dividing the look-up table and improving the parallel distributed algorithm by the symmetry of the FIR linear filter to reduce the size of the look-up table, an 18th-order low-pass FIR digital filter is designed by Kaiser window. Verilog-HDL application to complete the design of the various functional modules and the entire filter system. The Quartus II software is used to synthesize and simulate the top-level module. The results show that the designed FIR low-pass filter has the minimum stop band attenuation AS = -30d B, the in-band fluctuation <1d B, the cutoff frequency ωωc = 0.4π, Δω = 0.2π. Using Matlab to analyze the simulation results, verify that the designed FIR digital filter function is completely correct.