文档介绍：班级信工082学号16姓名刘刚实验组别实验日期室温报告日期成绩报告内容:(目的和要求,原理,步骤,数据,计算,小结等);给定正弦信号x(t)=2*cos(2*pi*10*t),fs=100HZ,求其DTFT。(a)代码:f=10;T=1/f;w=-10::10;t1=0::1;t2=0::1;n1=-2;n2=8;n0=0;n=n1::n2;x5=[n>=];x1=2*cos(2*f*pi*t1);x2=2*cos(2*f*pi*t2);x3=(exp(-j).^(t2'*w));x4=x2*x3;subplot(2,2,1);plot(t1,x1);axis([*min(x2)*max(x2)]);xlabel('x(n)');ylabel('x(n)');title('原信号x1');xlabel('t');ylabel('x1');subplot(2,2,3);stem(t2,x2);axis([*min(x2)*max(x2)]);title('原信号采样结果x2');xlabel('t');ylabel('x2');subplot(2,2,2);stem(n,x5);axis([*min(x5)*max(x5)]);xlabel('n');ylabel('x2');title('采样函数x2');subplot(2,2,4);stem(t2,x4);axis([01-+*min(x4)*max(x4)]);xlabel('t');ylabel('x4');title('DTFT结果x4');(b)结果:、卷积和共轭特性;x1(n)=[123456789101112];x2(n)=R10(n)线性:(a)代码:w=linspace(-8,8,10000);nx1=[0:11];nx2=[0:9];x1=[123456789101112];x2=[1111111111];x3=[x2,zeros(1,(length(x1)-length(x2)))];x4=2*x1+3*x3;X1=x1*exp(-j*nx1'*w);%频率特性X3=x3*exp(-j*nx1'*w);%频率特性X4=x4*exp(-j*nx1'*w);%频率特性subplot(5,3,1),stem(nx1,x1),axis([-1,13,0,15]);title('x1'),ylabel('x(n)');subplot(5,3,2),stem(nx2,x2),axis([-1,13,0,5]);title('x2');subplot(5,3,3),stem(nx1,x4),axis([-1,13,0,26]);title('x4=2*x1+3*x3');subplot(5,3,4),plot(w,abs(X1));ylabel('幅度')subplot(5,3,7),plot(w,angle(X1));ylabel('相位')subplot(5,3,10),plot(w,real(X1));ylabel('实部')subplot(5,3,13),plot(w,imag(X1));ylabel('虚部')subplot(5,3,5),plot(w,abs(X3));subplot(5,3,8),plot(w,angle(X3));subplot(5,3,11),plot(w,real(X3));subplot(5,3,14),plot(w,imag(X3));subplot(5,3,6),plot(w,abs(X4));subplot(5,3,9),plot(w,angle(X4));subplot(5,3,12),plot(w,real(X4));subplot(5,3,15),plot(w,imag(X4));(b)结果:(2)卷积:(a)代码:nx1=0:11;nx2=0:9;nx3=0:20;w=linspace(-8,8,40);%w=[-8,8]分10000份x1=[123456789101112];x2=[1111111111];x3=conv(x1,x2);%x1卷积x2x4=x1*exp(-j*nx1'*w);%x1频率特性x5=x2*exp(-j*nx2'*w);%x2频率特性x6=x3*exp(-j*nx3'*w);%x1卷积x2频率特性x7=x4.*x5;subplot(2,2,1),stem(nx1,x1),axis([-1,15,0,15]),title('x1');subplot(2,2,2),stem(nx2,x2),a