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%高頻放大器模塊
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function y=gf1(x);
N=length(x);
n=50;
Wn=[0.4, 0.8];         % 通帶范圍20M～40M  
b=fir1(n,Wn);         % n階帶通濾波器系數
x=[x,zeros(1,25)];
y=filter(b,1,x);
y=y(26:length(y));