南通大学DSP优秀课程设计实验及习题答案精.doc
南通大学DSP优秀课程设计实验及习题答案精.doc
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南通大学DSP课程设计试验加课后习题程序 试验一 n=-50:50; u=(n>=0; e=(0.8.^n; x1=e.*u; u1=(n>=4; u2=(n>=5; x2=(u1-u2; u3=(n>=0; u4=(n>=4; x2=(u3-u4; subplot(4,1,1;stem(n,u,'.' subplot(4,1,2;stem(n,x1,'.' subplot(4,1,3;stem(n,x2,'.' subplot(4,1,4;stem(n,x3,'.' 试验二 n=-100:100; x1=(n>=-2&(n<2; m=(-j*0.65.*pi*n; w=-2*pi:0.01:2*pi; X1=x1*exp(-j*n'*w; x=eps.^m; x2=x1.*x; X2=x2*exp(-j*n'*w; x3=(n>=0&(n<4; X3=x3*exp(-j*n'*w; figure(1 plot(w,abs(X1; figure(2 plot(w,abs(X2; figure(3 plot(w,abs(X3; 试验三 N1=64; N2=64； N3=100; n1=0:N1-1; n2=0:N2-1; n3=0:N3-1; x1=(n1>=0&(n1<8; X1=fft(x1,N1; a11=cos(0.5*pi.*n1; a21=cos(0.25*pi.*n1; a31=cos(0.125*pi.*n1; a12=cos(0.5*pi.*n2; a22=cos(0.25*pi.*n2; a32=cos(0.125*pi.*n2; x21=a11+a21+a31; x22=a12+a22+a32; X21=fft(x21,N1; X22=fft(x22,N2; a4=cos(0.5*pi.*n3; a5=cos(0.25*pi.*n3; a6=cos(0.125*pi.*n3; x3=a4+a5+a6; X3=fft(x3,N3 N4=250; n4=0:N4-1; u1=(n4>=0; u2=(n4>=N4; a7=cos(0.5*pi.*n4; a8=cos(0.25*pi.*n4; a9=cos(0.125*pi.*n4; x4=a7+a8+a9; y1=u1-u2; y2=hamming(N4; x41=x4.*y1; x42=x4.*y2'; X41=fft(x41,N4; X42=fft(x42,N4; figure(1 stem(n1,abs(X1,'.' figure(2 subplot(2,1,1;stem(n1,abs(X21,'.' subplot(2,1,2;stem(n2,abs(X22,'.' figure(3 stem(n3,abs(X3,'.' figure(4 subplot(2,1,1;stem(n4,abs(X41,'.' subplot(2,1,2;stem(n4,abs(X42,'.' subplot(2,1,1;stem(n,abs(X41,'.' subplot(2,1,2;stem(n,abs(X42,'.' 试验四 dt=0.0005; t=-0.005:dt:0.005; xa=exp(-1000*abs(t; n=-500:500; w=-3*pi:0.001:3*pi; Ts1=1/0; Ts2=1/5000; Ts3=1/1000; x1=exp(-1000*abs(n*Ts1; x2=exp(-1000*abs(n*Ts2; x3=exp(-1000*abs(n*Ts3; X1=x1*exp(-j*n'*w; X2=x2*exp(-j*n'*w; X3=x3*exp(-j*n'*w; figure(1; plot(t,xa; figure(2 subplot(3,1,1;stem(w,abs(X1 subplot(3,1,2;stem(w,abs(X2 subplot(3,1,3;stem(w,abs(X3 试验五 A=[1,-3.1836,4.6223,-3.7795,1.8136,-0.48,0.0544]; B=[0.0004,0.0022,0.0056,0.0075,0.0056,0.0022,0.0004]; figure(1; [H,w]=freqz(B,A; plot(w,abs(H,'' figure(2; h=impz(B,A; stem(h,'.'; figure(3; zplane(B,A; z=roots(B p=roots(A x=[-4,-2,0,-4,-6,-4,-2,-6,-6,-4,-4,-6,-6,-2,6,12,8,0,-16,-38,-60,-84,-90,-66,-32,-4,-2,-4,8,12,12,10,6,6,4,0,0,0,0,0,-2,-2,0,0,-2,-2,-2,-2,0]; figure(4; y=filter(B,A,x; stem(y A=[1,-3.1836,4.6223,-3.7795,1.8136,-0.48,0.0544]; B=[0.0004,0.0022,0.0056,0.0075,0.0056,0.0022,0.0004]; figure(1; [H,w]=freqz(B,A; plot(w,abs(H,'' figure(2; h=impz(B,A; stem(h,'.'; figure(3; zplane(B,A; z=roots(B p=roots(A x=[-4,-2,0,-4,-6,-4,-2,-6,-6,-4,-4,-6,-6,-2,6,12,8,0,-16,-38,-60,-84,-90,-66,-32,-4,-2,-4,8,12,12,10,6,6,4,0,0,0,0,0,-2,-2,0,0,-2,-2,-2,-2,0]; figure(4; y=filter(B,A,x; subplot(2,1,1;stem(x subplot(2,1,2;stem(y 试验六 Fs=5000; [b,a]=butter(3,pi/4*Fs,'s'; [c,d]=impinvar(b,a,Fs; [H,w]=freqz(c,d; figure(1 subplot(2,1,1 plot(w/pi,abs(H; ylabel('³å»÷ÏìÓ¦²»±ä·¨'; [m,n]=bilinear(b,a,Fs; [M,w]=freqz(m,n; subplot(2,1,2 plot(w/pi,abs(M; ylabel('Ë«ÏßÐԱ任·¨'; grid; wp=0.4*pi; ws=0.5*pi; ap=3; as=20; [N,wn]=buttord(wp/pi,ws/pi,ap,as; [b,a]=butter(N,wn,'low'; figure(2 freqz(b,a; n=0:47; x=1+cos(pi*n/4+cos(2*pi*n/3; y=filter(b,a,x; figure(3 subplot(2,1,1; plot(n,x; grid; subplot(2,1,2; plot(n,y; grid; ws=0.4*pi; wp=0.5*pi; ap=3; as=20; [N,wn]=buttord(wp/pi,ws/pi,ap,as; [b,a]=butter(N,wn,'high'; figure(4 freqz(b,a; n=0:47; x=1+cos(pi*n/4+cos(2*pi*n/3; y=filter(b,a,x; figure(5 subplot(2,1,1; plot(n,x; grid; subplot(2,1,2; plot(n,y; grid; wp=[0.2*pi 0.48*pi]; ws=[0.1*pi 0.55*pi]; ap=3; as=20; [N,wn]=buttord(wp./pi,ws./pi,ap,as; [b,a]=butter(N,wn,'bandpass'; figure(6 freqz(b,a; n=0:47; x=1+cos(pi*n/4+cos(2*pi*n/3; y=filter(b,a,x; figure(7 subplot(2,1,1; plot(n,x; grid; subplot(2,1,2; plot(n,y; grid; 试验七 N=25;wn=0.6; b=fir1(N,wn,hamming(N+1; [H,w]=freqz(b,1; figure(1 n=0:N; stem(b,'.'; grid figure(2 plot(w/pi,20*log10(abs(H; grid b2=fir1(N,wn,boxcar(N+1; [H2,w]=freqz(b2,1; figure(3 n=0:N; stem(b2,'.'; grid figure(4 plot(w/pi,20*log10(abs(H2; grid b3=fir1(N,wn,blackman(N+1; [H3,w]=freqz(b3,1; figure(5 n=0:N; stem(b3,'.'; grid figure(6 plot(w/pi,20*log10(abs(H3; grid N2=30;wn2=[0.3 0.6]; b4=fir1(N2,wn2,hamming(N2+1; [H4,w]=freqz(b4,1; figure(7 n=0:N; stem(b4,'.'; grid figure(8 plot(w/pi,20*log10(abs(H4; grid 习题一 n=-12:12; x=(n>=-2&(n<2; x0=(2.^n x1=x.*x0; subplot(3,1,1; stem(n,x1,'.' x01=(n>=-4&(n<4; x02=(n>-4&(n<=4; x2=x02-x01; subplot(3,1,2; stem(n,x2,'.' x3=cos(0.3*pi*n; subplot(3,1,3; stem(n,x3,'.' 习题二 n=-50:50; N1=16; n1=0:N1-1; N2=25; n2=0:N2-1; N3=32; n3=0:N3-1; N4=50; n4=0:N4-1; w=-2*pi:0.01:2*pi; x01=(n>=0; x02=(n>=32; x0=x01-x02; x1=sin(0.25*n*pi.*x0; figure(1 X1=dtft(x1,n,w; subplot(2,1,1; plot(w,abs(X1; subplot(2,1,2; plot(w,angle(X1; x2=sin(0.25.*n1*pi; figure(2 X2=fft(x2,N1; subplot(2,1,1; stem(n1,abs(X2; subplot(2,1,2; stem(n1,angle(X2; figure(3 X3=fft(x3,N2; subplot(2,1,1; stem(n2,abs(X3; subplot(2,1,2; stem(n2,angle(X3; figure(4 X4=fft(x4,N3; subplot(2,1,1; stem(n3,abs(X4; subplot(2,1,2; stem(n3,angle(X4; 习题三 dt=0.0005; t=-0.005:dt:0.005; x0=(exp(-1000*t.*cos(2*pi*t; n=-500:500; w=-3*pi:0.001:3*pi; Ts1=1/0; Ts2=1/5000; Ts3=1/1000; x1=(exp(-1000*n*Ts1.*cos(2*pi*n*Ts1; x2=(exp(-1000*n*Ts2.*cos(2*pi*n*Ts2; x3=(exp(-1000*n*Ts3.*cos(2*pi*n*Ts3; X1=dtft(x1,n,w; X2=dtft(x2,n,w; X3=dtft(x3,n,w; figure(1; plot(t,x0; figure(2 subplot(3,1,1;plot(w,abs(X1 subplot(3,1,2;plot(w,abs(X2 subplot(3,1,3;plot(w,abs(X3 习题四 A=[1,-0.5]; B=[1,2]; figure(1; zplane(B,A; z=roots(B p=roots(A figure(2; h=impz(B,A; stem(h,'.'; figure(3; [H,w]=freqz(B,A; plot(w,abs(H,'' figure(4; n=0:19; x=(n>=0&(n<20; y=filter(B,A,x; subplot(2,1,1; stem(x subplot(2,1,2; stem(y 习题五 wn=[0.1*pi 0.2*pi]; N=10; [b,a]=butter(N,wn,'bandpass'; figure(1 freqz(b,a; figure(2 n=0:N; stem(b,'.';grid; 习题六 wp=0.1; ws=0.2; Rp=3;Rs=30; [N,wn]=buttord(wp,ws,Rp,Rs; [b,a]=butter(N,wn,'low'; freqz(b,a; 习题七 Fs=1; figure(1 [b,a]=butter(2,pi/4*Fs,'s'; [c,d]=impinvar(b,a,Fs; [H,w]=freqz(c,d; plot(w/pi,abs(H; ylabel('³å¼¤ÏìÓ¦²»±ä·¨'; grid [q,w]=butter(2,pi/4*Fs,'s'; [q0,w0]=lp2hp(q,w,pi/4*Fs' [m,n]=bilinear(q0,w0,Fs; [H,w]=freqz(m,n; figure(2 plot(w/pi,abs(H; ylabel('Ë«ÏßÐԱ任·¨'; grid 习题八 N=18;wn=0.4; b=fir1(N,wn,hamming(N+1; [H,w]=freqz(b,1; figure(1 n=0:N; subplot(2,1,1; stem(b,'.'; subplot(2,1,2; plot(w/pi,20*log10(abs(H; ylabel('º£Ã÷´°'; b2=fir1(N,wn,boxcar(N+1; [H2,w]=freqz(b2,1; figure(2 n=0:N; subplot(2,1,1; stem(b2,'.'; subplot(2,1,2; plot(w/pi,20*log10(abs(H2; ylabel('¾ØÐδ°'; b3=fir1(N,wn,blackman(N+1; [H3,w]=freqz(b3,1; figure(3 n=0:N; subplot(2,1,1; stem(b3,'.'; subplot(2,1,2; plot(w/pi,20*log10(abs(H3; ylabel('²¼À³¿ËÂü´°'; 习题九 N=16;wn=0.5; b=fir1(N,wn,'high',hamming(N+1; [H,w]=freqz(b,1; subplot(2,1,1; n=0:N; stem(b,'.'; grid subplot(2,1,2; plot(w/pi,20*log10(abs(H; grid展开阅读全文
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