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1.实验目的 (1)掌握离散时间信号的z变换和z逆变换分析 (2)掌握MATLAB中利用filter函数求解差分方程; (3)掌握MATLAB中利用impz函数求解单位冲击响应h(n); (4)掌握MATLAB中利用freqz函数求解幅频特性曲线和相频特性曲线; (5)掌握MATLAB中利用zplane函数求解零极点; 2.实验内容 ②求h(n),画图; 脉冲响应函数 ③求幅频、相频,画图; ④求零极点图; 实验步骤和实验结果(1)掌握离散时间信号的z变换和z逆变换分析
(2) (2)掌握MATLAB中利用filter函数求解差分方程;
(3)掌握MATLAB中利用impz函数求解单位冲击响应h(n);
(4)掌握MATLAB中利用freqz函数求解幅频特性曲线和相频特性曲线; 解卷绕:
未解卷绕
(5)掌握MATLAB中利用zplane函数求解零极点;
4.实验小结 本节实验课学习了如何用MATLAB进行离散时间信号的z变换和z逆变换分析,以及利用filter函数求解差分方程、利用impz函数求解单位冲击响应h(n)、利用freqz函数求解幅频特性曲线和相频特性曲线和利用zplane函数求解零极点。 %% (1)计算Z变换和逆Z变换 clc;clear; syms n f=0.5^n+(1/3)^n; F=ztrans(f) pretty(F); syms z F=2*z/(z-2)^2; f=iztrans(F) %% (2) %x(n)=ones(1,100),求y(n),画图,即求系统的阶跃响应 clc;clear; x=ones(100); t=1:100; b=[0.001836,0.007344,0.011016,0.007374,0.001836]; a=[1,-3.0544,3.8291,-2.2925,0.55075]; y=filter(b,a,x); plot(t,x,'r',t,y,'k-'); ylabel('x(n) & y(n)') xlabel('n') % 求h(n),画图; 脉冲响应函数 clc;clear; b=[0.001836,0.007344,0.011016,0.007374,0.001836]; a=[1,-3.0544,3.8291,-2.2925,0.55075]; [h,t]=impz(b,a,40); stem(t,h,'.'); % 求幅频、相频,画图 clc;clear; b=[0.001836,0.007344,0.011016,0.007374,0.001836]; a=[1,-3.0544,3.8291,-2.2925,0.55075]; [H,w]=freqz(b,a,256,'whole',1); Hr=abs(H); Hphase=angle(H); % Hphase=unwrap(Hphase);%解卷绕 subplot(211),plot(w,Hr); ylabel('幅频') subplot(212),plot(w,Hphase); ylabel('相频') % 求零极点图 clc;clear; b=[0.001836,0.007344,0.011016,0.007374,0.001836]; a=[1,-3.0544,3.8291,-2.2925,0.55075]; zplane(b,a);
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