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www.eeworm.com/read/362213/10012425
m ex6_13.m
% Example 6.13
w = -300:300;
S = .1*sinc(.1*w/2/pi).*exp(-.05*j*w);
subplot(221),plot(w,abs(S))
axis([-300 300 0 .1])
xlabel('\omega')
ylabel('Magnitude')
subplot(223),plot(w,angle(S)*180/pi)
www.eeworm.com/read/362213/10012503
m ex12_1.m
% Example 12.1
%
numd = 0.0302*[1 2 1];
dend = [1 -1.4514 .5724];
w = -pi:2*pi/300:pi;
H = freqz(numd,dend,w);
plot(w,abs(H))
axis([-pi pi 0 1])
title('Figure 12.6')
ylabel('|Hd|')
xlabel('\
www.eeworm.com/read/362213/10012550
m ex12_5.m
% Example 12.5
%
N = 2; % number of poles
Rp = 3; % passband ripple
T = .2; % sampling period
wc = 2; % analog cutoff frequency
Omegac = wc*T/pi; % normalized digital cutoff frequenc
www.eeworm.com/read/362213/10012557
m fig12_13.m
% Figure 12.13
%
N = 10;
Omega = -pi:2*pi/300:pi;
Omega = Omega + (Omega==0)*eps; % replaces Omega = 0 with eps
W = sin(Omega*(N)/2).*exp(-j*Omega*(N-1)/2)./sin(Omega/2);
plot(Omega,abs(W));
axis([-
www.eeworm.com/read/362213/10012570
m ex11_25.m
% Example 11.25
%
num = [0 1];
den = [1 -.5];
OMEGA = -pi:pi/150:pi;
H = freqz(num,den,OMEGA);
clf % clears current figure
subplot(211),plot(OMEGA,abs(H));
% The figure in the text was genera
www.eeworm.com/read/362213/10012573
m fig12_21.m
% Figure 12.21
%
clf
N = 20;
w1 = ones(1,N+1); % rectangular window
w3 = hamming(N+1);
w2 = [0; hanning(N-1); 0]; % to correspond to our def.
% plot frequency response
Omega = -pi:2*pi/1000:pi;
www.eeworm.com/read/362213/10012593
m ex5_4.m
% Example 5.4
t = -3:6/800:3;
w0 = pi;
k=1:50;
% first plot the amplitude spectrum for x and for y
ckx = sin(k*pi/2)./k/pi;
ckx = [ckx(length(ckx):-1:1), .5, ckx];
k = -50:50;
clf
subplot(21
www.eeworm.com/read/362213/10012597
m fig4_7.m
% Figure 4.7
% Computes the frequency spectra for the pulse train
c0 = 0.5;
w0 = pi;
k = -9:9;
magck = [1/pi 0 1/pi/3 0 1/pi/5 0 1/pi/7 0 1/pi/9];
magck = [magck(9:-1:1) c0 magck];
angck =
www.eeworm.com/read/362213/10012682
m ex12_2.m
% Example 12.2
%
T = .2; wc = 2;
wp = 2/T*tan(wc*T/2);
K = T^2/4*wp^2;
dend =[(1+wp*T/sqrt(2)+T^2*wp^2/4) (T^2*wp^2/2-2) (1-wp*T/sqrt(2)+T^2*wp^2/4)];
K = K/dend(1)
numd = K*[1 2 1]
dend = den
www.eeworm.com/read/362213/10012686
m ex12_10.m
% Example 12.10
%
Omegac = .4;
N = 41; % length of filter
m = (N-1)/2; % phase shift
n = 0:2*m+10;
n_m = n-m + ((n-m)==0)*eps; % to avoid dividing by zero
h = sin(Omegac*(n_m))/pi./(n_