www.pudn.com > leidaxitong.rar > gf1.m

% 
%高频放大器模块 
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function y=gf1(x); 
N=length(x); 
n=50; 
Wn=[0.4, 0.8];         % 通带范围20M～40M   
b=fir1(n,Wn);         % n阶带通滤波器系数 
x=[x,zeros(1,25)]; 
y=filter(b,1,x); 
y=y(26:length(y));