數字信號處理實驗報告實驗名稱：IIR和FIR數字濾波器過濾信號的實現及比較學生姓名：學生學號：學生班級：上課時間：周三上午實驗目的掌握數字濾波器的計算機仿真方法；（2）通過觀察對實際心電圖信號的濾波作用，獲得數字濾波器的感性知識。二、實驗內容及其要求編寫FIR數字濾波器實現程序，計算其對心電圖信號取樣序列x(n)的響應序列yFIR(n)。編寫IIR濾波器實現程序，計算其對心電圖信號取樣序列x(n)的響應序列yIIR(n)。在通過計算機上運行上述兩個濾波器實現程序，在屏幕上打印出x(n)、yFIR(n)和yIIR(n)，并進行比較。MATLAB程序如下：N=21;hn=fir1(20,0.2);%采用海明窗和fir1函數得到hnxn=[4-20-4-6-4-2-4-6-6-4-4-6-6-261280-16-38-60-84-90-66-32-4-2-48121210666400000-2-4000-2-200-2-2-2-20];n=1:56;y=conv(xn,hn)b=[0.2318,0.4638,0.2318];a1=[1,0.4164,-0.6006];y1=filter(b,a1,xn);a2=[1,0.3093,-0.1888];y2=filter(b,a2,y1);a3=[1,0.2692,-0.0349];yn=filter(b,a3,y2)subplot(3,1,1);stem(n,xn,’.’);title('xn');subplot(3,1,2);stem(y,’.’);title('FIR');subplot(3,1,3);stem(yn,’.’);title('IIR');其圖形如下所示：在屏幕上打出的x(n)、yFIR(n)和yIIR(n)的值如下所示：xn=Columns1through234-20-4-6-4-2-4-6-6-4-4-6-6-261280-16-38-60-84Columns24through46-90-66-32-4-2-48121210666400000-2-400Columns47through560-2-200-2-2-2-20y=Columns1through14-0.0000-0.0085-0.0211-0.0338-0.01770.06270.22000.41080.52880.43710.0379-0.6700-1.5794-2.5200Columns15through28-3.3326-3.9352-4.3524-4.6850-5.0139-5.2959-5.2917-4.6284-2.9795-0.35462.65554.76654.2089-0.7149Columns29through42-10.7868-25.1491-41.1312-54.8863-62.7218-62.4929-54.3926-40.7837-25.1846-10.9376-0.17236.51479.716510.5210Columns43through569.91448.55906.85105.05423.38031.95240.8142-0.0483-0.6703-1.0693-1.2677-1.3047-1.2278-1.0944Columns57through70-0.9679-0.9053-0.9396-1.0680-1.2444-1.3973-1.4569-1.3771-1.1525-0.8298-0.4845-0.1975-0.01560.0606Columns71through760.06480.04010.01690.00420.00000yn=Columns1through140.04980.22460.39980.3113-0.1326-0.8632-1.6394-2.1137-2.2884-2.5000-2.8697-3.1790-3.2774-3.3135Columns15through28-3.4147-3.2944-2.3927-0.52991.57202.57531.2419-3.2079-10.9516-21.3435-32.4322-40.7146-42.7260-37.8156Columns29through42-28.8984-19.8843-12.5329-6.5080-1.55741.96083.89764.59734.63514.35363.73612.82241.89731.1943Columns43through560.70660.2665-0.2476-0.6786-0.7812-0.6409-0