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% for example 2.9 P49 N = 80; n = 0:N; x1 = sin(0.05*pi*n); x2 = sin(0.15*pi*n); x3 = sin(0.25*pi*n); x = x1 + x2/3 + x3/5; subplot(221),stem(n,x1);ylabel('x1'); subplot(222),stem(n,x2);ylabe

% for example 2.10 P50 N = 350; n = 0:N; x1 = cos(0.1*pi*n); x2 = cos(0.01*pi*n); y = x1 .* x2; subplot(311),plot(n,x1);title('x1=cos(0.1*pi*n)'); subplot(312),plot(n,x2);title('x2=cos(0.01*pi

% Program 11_13 % DFT Sample Computation Using CZT % n = 0:31; x = sin(2*pi*11*n/64); A = exp(i*2*pi*84/512); V = exp(-i*2*pi/512); XC = czt(x, 8, V, A); disp('CFT Samples') disp(abs(XC));

close all clc clear %定义时间范围 t=[0:pi/20:9*pi]; hold on %允许在同一坐标系下绘制不同的图形 plot(t,sin(t),'r:*') plot(t,cos(t)) plot(t,-cos(t),'k') grid on %在所画出的图形坐标中添加栅格，注意用在plot之后 hold off %覆盖旧图

%plot绘图命令的使用 close all %关闭打开了的所有图形窗口 clc %清屏命令 clear %清除工作空间中所有变量 %定义时间范围 t=[0:pi/20:8*pi]; y=sin(t); plot(t,y,'b:square') % r表示线的颜色为红色，此外 y（黄色）g（绿色）b（蓝色) %

close all clc clear %定义时间范围 t=[0:pi/20:9*pi]; figure(1) %选择图像 plot(t,sin(t),'r:*') grid on %在所画出的图形坐标中添加栅格，注意用在plot之后 grid off %删除栅格 figure(2) plot(t,cos(t)) grid on grid off

%图形文字标示命令的使用 clear close all clc t=[0:pi/20:5*pi]; plot(t,sin(t),'r:*') axis([0 5*pi -1.5 1.5 ]) %给x轴和y轴命名 xlabel('t(deg)') ylabel('magnitude') %给图形加标题 title('sine wave from zero to 5\pi')

%plot绘图命令的使用 clc %清屏命令 clear %清除工作空间中所有变量 %定义时间范围 t=[0:pi/20:9*pi]; y1=sin(t); y2=cos(t); plot(t,y1,t,y2)

% Program P3_5 % Modulation Property of DTFT clf; w = -pi:2*pi/255:pi; x1 = [1 3 5 7 9 11 13 15 17]; x2 = [1 -1 1 -1 1 -1 1 -1 1]; y = x1.*x2; h1 = freqz(x1, 1, w); h2 = freqz(x2, 1, w); h3 =

% Program P3_2 % Time-Shifting Properties of DTFT clf; w = -pi:2*pi/255:pi; wo = 0.4*pi; D = 10; num = [1 2 3 4 5 6 7 8 9]; h1 = freqz(num, 1, w); h2 = freqz([zeros(1,D) num], 1, w); subplot(2,