信号与系统课设-滤波器.pdf

?=?=?C?C?J?J *?*?44?7?7?,?,?8?8 L?3+?p?L?3+?p?0?W?4?f?0?W?4?f?0?%?#?,AA?0?%?#?,AA?0?FJ%?#?1.+eD?3+5?AA 2.+eD?B$?!”+eD?.?_?0?Z1?,?0Lf?FJ%?#?FJEB38R?R?R?0Lf%?#?,2?=Q?#?Q?%?#?,%?#?7-?6?J?Z?0Lf%?#?b6?Q?Lf%?#?%?#?Lf?CQ?%?#?x?C?-?3.?Lf?FJ%?#?+eD?!”?.?8?65?Lf?FJ%?#?+eD?j?Q?%?#?,2?$?+X?A?:?.?6?0Lf%?#?i?Lf%?#?,?A?n?W?6E?7-?Lu?f?,E?W?E?/j?j?Q?FJ%?#?1?+eD?3+5?AA 2.+eD?B$?Q?FJ%?#?,?a?_?6?FJ%?#?,+e?+eLk?FJ%?#?2?l?!”+eD?FJEB3?rR?R?R?FJ%?#?-(?C?,?:?.?Lf?FJ%?#?2?l?!”+eD?9?n?W%?#?,?,7-?9?VFJ%?#?1.+eD?3+5?AA 2?+eD?B$?VFJ%?#?_?6?FJ%?#?Q?FJ%?#?b6?,?&?_?FJ%?#?,?Z!?N)?N?U?l?W?Q?FJ%?#?,?Z!?N)?Q?FJ%?#?-?,N)?FJ?V?3.+eD?!”?.?8?65?Lf?VFJ%?#?+eD?!”+eD?AAA,+eD?+?9?=?:?.+eD?9?)?,?n?W?7-?6?1.?B.?=L?)%?#?,Q?9?$(?7?M?T?Z?FJE?Ct?6?B.?,?.?A?)?7?M?%?#?Q?J?*)E?,#?F&?9?$(?M?F?*6?#%?#?p?)?;?9?Z%?#?,?/-O?A?G?G+X,?_?$(?M Q?2.?;?.1,F?|)?jMATLAB7.0 3.?A,?/-O?_?X?5?wp,ws,rp,rs,?&?;?xA1?*%?#?Lf?+k?*?.4?4.wp?FJ?VE5HN)ws:Lk?VE5HN)rp?FJ?V?,?_?u#?,+dB?rs?Lk?V?,+dB?0?FJ%?#?1.?.1?uN?uN?wp=100*2*pi;ws=200*2*pi;rp=2;rs=15;n,wn=buttord(wp,ws,rp,rs,s);b,a=butter(n,wn,s);H,wn=freqs(b,a);plot(wn/(2*pi),abs(H);fprintf(n*BUTTERWORTH FILTER ORDER =%2.0fn,n);grid on;xlabel(N)/Hz);ylabel(|H|);title(?FJ%?#?/-O);xlim(0,300);ylim(0,1);*BUTTERWORTH FILTER ORDER=8 -(N?-(N?wp=100*2*pi;ws=200*2*pi;rp=2;rs=40;n,wn=buttord(wp,ws,rp,rs,s);b,a=butter(n,wn,s);H,wn=freqs(b,a);plot(wn/(2*pi),20*log10(abs(H);fprintf(n*BUTTERWORTH ILTER ORDER=%2.0fn,n);grid on;xlabel(N)/Hz);ylabel(-(N);title(?FJ%?#?/-O);*BUTTERWORTH FILTER ORDER=8?X?:,?.1A?%?#?j?Lf?F?l?6?4-;?*6?#%?#?,?4?;MAA?X%?#?,Lf?=?g,?FJE-(N?4,?j?P?X?:?.1?f%?#?,?_?rp?rs?;MA?rp=2?rs=15?!”?&*BUTTERWORTH FILTER ORDER=3?6?:?;?T?Z?.?E?)?9Lf%?#?Lf%?#?-(?%?#?7-?n?=?Lf%?#?+a!”?B$?%?#?Lf?CQ?%?#?x?C?-?Q?FJ%?#?1.?.1?uN?uN?wp=100*2*pi;ws=200*2*pi;rp=2;rs=40;fs=1000;n,wn=buttord(wp,ws,rp,rs,s);z,p,k=buttap(n);b,a=zp2tf(z,p,k);fprintf(n*BUTTERWORTH FILTER ORDER=%2.0fn,n);wd=0:0.01:600*pi;b,a=lp2hp(b,a,wn)mag,phase=bode(b,a,wd);plot(wd,mag);grid on;xlabel(N)/Hz);ylabel(|H|);title(Q?FJ%?#?/-O);*BUTTERWORTH FILTER ORDER=8 -(N?-(N?wp=100*2*pi;ws=200*2*pi;rp=2;rs=40;n,wn=buttord(wp,ws,rp,rs,s);z,p,k=buttap(n);b,a=zp2tf(z,p,k);fprintf(n*BUTTERWORTH FILTER ORDER=%2.0fn,n);wd=0:0.01:600*pi;b,a=lp2hp(b,a,wn)mag,phase=bode(b,a,wd);plot(wd,phase);grid on;xlabel(N)/Hz);ylabel(-(N);title(Q?FJ%?#?/-O);*BUTTERWORTH FILTER ORDER=8?9?VFJ%?#?1.?.1?uN?uN?:w0=4;wb=2;rp=3;rs=40;n,wn=buttord(w0,wb,rp,rs,s);fprintf(n*BUTTERWORTH FILTER ORDER=%2.0fn,n);b,a=butter(n,wn,s);b,a=lp2bp(b,a,w0,wb);w=0:0.001:20;mag,phase=bode(b,a,w);plot(w,mag);grid on;xlabel(omega(rad/s);ylabel(|H|);title(?VFJ%?#?/-O);*BUTTERWORTH FILTER ORDER=7 -(N?-(N?w0=4;wb=2;rp=3;rs=40;n,wn=buttord(w0,wb,rp,rs,s);fprintf(n*BUTTERWORTH FILTER ORDER=%2.0fn,n);b,a=butter(n,wn,s);b,a=lp2bp(b,a,w0,wb);w=0:0.001:20;mag,phase=bode(b,a,w);plot(w,phase);grid on;xlabel(omega(rad/s);ylabel(-(N);title(?VFJ%?#?/-O);*BUTTERWORTH FILTER ORDER=7?9?AA?5?9?AA?5?!QB.0;AA?k?L?X%?#?,?/-O?/-O?9?T/2?F9?)+k?-,AA?.?/-O?X+X?g5?4?Z?G?A A0;?/-O?.4?j?65?Lu?+X5?8?$3W?08AA%?#?J5?*%?#?2?r665?%?#?,AA?=L?L&?X?/-O0;?,5F?AF9?0?h+X,MATLAB?Q?G+X,?_?$(?K7-FJE8?!A?,?Q?*6?#,?FJ?Q?FJ?VFJ%?#?D?&#kB3?3+?f?Lu+O#k?)%?#?2?,?r?=?0?JF?xQ?&?I?FJEB3?wp 1y3+?i?%?#?Lf?E?*6?#?x?k60?!”!QAAA?A1?0!Q?MATLAB?D5F?*?8?!,0;?A?MB?+X?=?0?7-?O?$&#k,F?+XMATLAB?63?)?63?)?3+5?*.p?+XWEB?MATLAB?(x?0?*(x/n Edward W.Kamen&Bonnie S.Heck 2002?+XWeb?MATLAB,?3+5?*.p?+e?J?*(x/n?f*6AMATLAB?0;?+e?J?*(x/n?0?MATLAB?#q0;,5?:?0;?B.?&