三個同頻帶信號的頻分復(fù)用gui設(shè)計畢業(yè)論文-資料下載頁
2025-06-26 12:32本頁面
【正文】 ord(wpz,wsz,rp1,rs1)。[Bdz,Adz]=butter(Nd,wdc)。[h1,f1]=freqz(Bdz,Adz,512,fs1)。plot(f1,abs(h1))。grid onxlabel(39。hz39。)。ylabel(39。db39。)。title(39。巴特沃茲低通濾波器的頻率特性39。)fs2=2000。wp1=2*100*pi/fs2。wp2=2*300*pi/fs2。ws1=2*60*pi/fs2。ws2=2*500*pi/fs2。Rp2=1。Rs2=40。Wp=[wp1/pi,wp2/pi]。Ws=[ws1/pi,ws2/pi]。[N,Wn]=cheb1ord(Wp,Ws,Rp2,Rs2)。[B,A]=cheby1(N,Rp2,Wn)。[h2,f2]=freqz(B,A,512,fs2)。plot(f2,abs(h2))。grid onxlabel(39。hz39。)。ylabel(39。db39。)。title(39。切比雪夫帶通濾波器的頻率特性39。)axis([0,600,0,])fp1=450。fpu=700。fs1=350。fsu=800。fs=2000。wp3=[2*fp1/fs,2*fpu/fs]。ws3=[2*fs1/fs,2*fsu/fs]。rp3=1。rs3=30。[N3,wpo3]=ellipord(wp3,ws3,rp3,rs3)。[Be,Ae]=ellip(N3,rp3,rs3,wpo3)。[h3,f3]=freqz(Be,Ae,512,fs)。plot(f3,abs(h3))。grid onxlabel(39。hz39。),ylabel(39。db39。)。title(39。橢圓帶通濾波器的頻率特性39。)axis([0,1000,0,])第五步用濾波器對信號進(jìn)行濾波y1=filter(Bdz,Adz,x)。Y1=fft(y1,512)。subplot(211)。plot(y1(1:256))。title(39。濾波后x1的時域波形39。)。axis([0,100,1,1]) f1=1000*(0:256)/512。subplot(212)plot(f1,abs(Y1(1:257)))。title(39。濾波后x1的頻譜波形39。)。axis([0,500,0,250])y2=filter(B,A,x)。Y2=fft(y2,512)。subplot(211)。plot(512*t,y2)。title(39。濾波后x2的時域波形39。)。axis([0,100,1,1]) f2=2000*(0:256)/512。subplot(212)。plot(f2,abs(Y2(1:257)))。title(39。濾波后x2的頻譜波形39。)。axis([0,500,0,250])y3=filter(Be,Ae,x)。Y3=fft(y3,512)。subplot(211)。plot(y3)。title(39。濾波后x3的時域波形39。)。axis([0,100,1,1])f1=1000*(0:256)/512。subplot(212)。plot(f1,abs(Y3(1:257)))。title(39。濾波后x3的頻譜波形39。)。axis([0,500,0,300])22
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