ASP高级网 t=0:0.0000002:0.0006 ％ ts=0.2ms 每周期1000点 x1=sin(5000*2*pi.*t) ％ 生成5KHz的正弦波 b=fir1(9,0.01,hanning(10)) ％ 采样频率是100KHz，截止频率为500Hz的9阶汉宁窗生成b系数。 freqz(b,1,512,100000) y=filter(b,1,x1) ％ 对5KHz正弦波用9阶汉宁窗进行滤波 plot(t,x1,t,y) 仿真结果未见到y被衰减的滤波效

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