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m am_dem.m
% am-dem.m
% Matlab demonstration script for envelope detection. The message signal
% is +1 for 0 < t < t0/3, -2 for t0/3 < t < 2t0/3 and zero otherwise.
echo on
t0=.15;
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m fm2.m
% fm2.m
% Matlab demonstration script for frequency modulation. The message signal
% is m(t)=sinc(100t).
echo on
t0=.2; % signal duration
ts=0.001;
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m ip_03_04.m
% MATLAB script for Illustrative Problem 3.4.
% Demonstration script for LSSB-AM modulation. The message signal
% is +1 for 0 < t < t0/3, -2 for t0/3 < t < 2t0/3, and zero otherwise.
echo on
t0=
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m ip_03_02.m
% MATLAB script for Illustrative Problem 3.2.
% Matlab demonstration script for DSB-AM modulation. The message signal
% is m(t)=sinc(100t).
echo on
t0=.2; % signal duration
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m dsb1.m
% dsb1.m
% Matlab demonstration script for DSB-AM modulation. The message signal
% is +1 for 0 < t < t0/3, -2 for t0/3 < t < 2t0/3 and zero otherwise.
echo on
t0=.15;
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m lssb.m
% lssb.m
% Matlab demonstration script for LSSB-AM modulation. The message signal
% is +1 for 0 < t < t0/3, -2 for t0/3 < t < 2t0/3 and zero otherwise.
echo on
t0=.15;
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m ip_03_11.m
% MATLAB script for Illustrative Problem 3.11.
% Demonstration script for frequency modulation. The message signal
% is m(t)=sinc(100t).
echo on
t0=.2; % signal dura
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m ip_03_09.m
% MATLAB script for Illustrative Problem 3.9.
% Demonstration script for envelope detection. The message signal
% is +1 for 0 < t < t0/3, -2 for t0/3 < t < 2t0/3, and zero otherwise.
echo on
t0=.1
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m samp3_1_2.m
%Samp3_1_2
if(mod(N,2)~=1)a(m)=a(m)/2; end %此时b(m)为零，a(m)减半
for ii=0:N-1
xx(ii+1)=a(1)/2;
for k=1:m-1
xx(ii+1)=xx(ii+1)+a(k+1)*cos(2*pi*k*ii/N)+b(k+1)*sin(2*pi*k*ii/N);
%
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m samp2_1.m
%Samp2_1
N=[-3 -2 -1 0 1 2 3 4 5 6 7 8 9 10]; %为序号序列。
X=[0 1 2 3 2 1 0 -1 -2 -3 -4 -5 1 2]; %为值序列。
subplot(2,1,1),stem(N,X); %绘出离散值图
hold on;plot(N,zeros(1,length(