Research on FIR Digital Filter Design Using an Improved Window Function
Xiaohui Deng · Journal of Hengyang Normal University · 2010
Window function has been used to design a linear phase digital filer for long times,but the use of optimization techniques for designing digital filter has become widespread in recent year.A new method has been proposed to improve FIR window function in this paper.The window function that combines with cosine sequences in linear is different from previous Hann,Hamming and Blackman window function.The paper also proposes linear programming to optimize characterization of FIR digital filter according to its magnitude condition,and gives out the algorithm to design digital filter using the improved window function.Finally,we have designed FIR filter using new window for simulation and compared with the filter designed by Hamming window,Blackman window function.The simulation results show that filters designed using this method to meet the design specifications.