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无限冲激响应低通滤波器的设计

于 2023-02-04 发布 文件大小:1.88 kB
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%IIR数字滤波器的设计 %设计一个低通数字滤波器,设计指标:通带截止角频率为ωp,阻带截止频率为ωs,通带最大衰减为δp,阻带最小衰减为δs %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%冲激响应不变法%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clc; clear all; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%利用巴特沃斯设计低通模拟滤波器%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     wp = 0.2*pi; ws = 0.3*pi; Deltap = -1; Deltas = -15;%低通数字滤波器设计指标     TS = 1;%采样时间TS     Wp = wp/TS; Ws = ws/TS; DeltaP = Deltap; DeltaS = Deltas; %求取模拟滤波器的设计指标     %确定巴特沃斯的阶数N和截止频率Ωc     N = log((10^(-DeltaP/10)-1)/(10^(-DeltaS/10)-1))/(2*log(Wp/Ws));     N = ceil(N);          %模拟滤波器的阶数N     Wc = vpa( Ws/( ( 10^( -DeltaS/10 )-1 )^( 1/( 2*N ) ) ),5 )%模拟滤波器的截止频率Wc %%获得模拟滤波器的系统函数H(s) &n

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