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www.eeworm.com/read/168453/9912723
m ex071900.m
% 第七章: 例 7.19
% 频率采样技术: 差分器
%
M = 33; alpha = (M-1)/2; Dw = 2*pi/M;
l = 0:M-1; wl = Dw*l;
k1 = 0:floor((M-1)/2); k2 = floor((M-1)/2)+1:M-1;
Hrs = [j*Dw*k1,-j*Dw*(M-k2)];
angH = [-alpha*Dw*k1, a
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m ex030400.m
%第三章: 例3.4:
% 用矩阵-向量乘法求有限长序列的DTFT
%
n = -1:3; x = 1:5; % x(n)序列
k = 0:500; w = (pi/500)*k; % [0, pi] 轴分为501点.
X = x * (exp(-j*pi/500)) .^ (n'*k); % 用矩阵-向量乘法求DTFT
magX
www.eeworm.com/read/168453/9912744
m ex030600.m
% 第三章: 例 3.6:
%
subplot(1,1,1)
n = -5:5; x = (-0.9).^n;
k = -200:200; w = (pi/100)*k;
X = x * (exp(-j*pi/100)) .^ (n'*k);
magX = abs(X); angX =angle(X);
subplot(2,1,1); plot(w/pi,magX);grid
ax
www.eeworm.com/read/168453/9912746
m ex031200.m
% 第三章: 例 3.12:
%
n = -5:10; x = sin(pi*n/2);
k = -100:100; w = (pi/100)*k; % -pi和+pi之间的频率
X = x * (exp(-j*pi/100)).^(n'*k); % x的DTFT
% 信号分解
[xe,xo,m] = evenodd(x,n); % 偶部和奇部
www.eeworm.com/read/168453/9912750
m ex030900.m
% 第三章: 例 3.9:
%
n = 0:100; x = cos(pi*n/2);
k = -100:100; w = (pi/100)*k; % 把 -pi 到 +pi 分为201点
X = x * (exp(-j*pi/100)).^(n'*k); % x 的 DTFT
%
y = exp(j*pi*n/4).*x; % 把信
www.eeworm.com/read/168453/9912751
m ex030300.m
% 第三章: 例 3.3:
%
w = [0:1:500]*pi/500; % 把[0, pi] 轴分为501点.
X = exp(j*w) ./ (exp(j*w) - 0.5*ones(1,501));
magX = abs(X); angX = angle(X);
realX = real(X); imagX = imag(X);
subplot(2,2,1); plot(w/
www.eeworm.com/read/168453/9912754
m ex039900.m
% 第三章: 例 3.99:
%
w = [-100:100]*pi/100; % -pi and +pi之间的频率
N = 5;
X1 = sin((w+eps)*N/2)./sin((w+eps)/2);
N = 15;
X2 = sin((w+eps)*N/2)./sin((w+eps)/2);
N = 25;
X3 = sin((w+eps)*N/2)./sin((w+ep
www.eeworm.com/read/168453/9912759
m ex030500.m
% 第三章: 例 3.5:
%
subplot(1,1,1)
n = 0:10; x = (0.9*exp(j*pi/3)).^n;
k = -200:200; w = (pi/100)*k;
X = x * (exp(-j*pi/100)) .^ (n'*k);
magX = abs(X); angX =angle(X);
subplot(2,1,1); plot(w/pi,mag
www.eeworm.com/read/168453/9912767
m ex031300.m
% 第三章: 例 3.13:
%
w = [0:1:500]*pi/500; % 把[0, pi]轴分为501个点
X = exp(j*w) ./ (exp(j*w) - 0.9*ones(1,501));
magX = abs(X); angX = angle(X);
subplot(2,1,1); plot(w/pi,magX); grid; axis([0,1,0,10])
x
www.eeworm.com/read/168453/9912780
m ex082900.m
% Chapter 8: Example 8.29
% Elliptic Bandpass Filter Design:
% Use of the ELLIP function
%
% 第八章: 例 8.29
% 椭圆带通滤波器设计
% ELLIP函数的应用
%
% 数字低