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%带通信号经过带通系统的等效基带表示 clear all; close all; dt = 0.01; t = 0:dt:5; s1 = exp(-t).*cos(20*pi*t); %输入信号 [f1 s1f]= T2F(t,s1); %输入信号的频谱 s1_lowpass = hilbert(s1).*exp(-j*2*pi*

%FM modulation and demodulation clear all; close all; Kf = 5; fc = 10; T=5; dt=0.001; t = 0:dt:T; %信源 fm= 1; %mt = cos(2*pi*fm*t) + 1.5*sin(2*pi*0.3*fm*t); %信源信号 mt = cos(2

%低通抽样定理 clear all; close all; dt = 0.01; t = 0:dt:10-dt; xt = 0.1*cos(0.15*pi*t)+1.5*sin(2.5*pi*t)+0.5*cos(4*pi*t); [f,xf] = T2F(t,xt); %抽样信号，抽样速率为4Hz fs = 4; sdt = 1/fs; t1 = 0:sdt:10-d

theta=linspace(0,2*pi), rho=sin(2*theta).*cos(2*theta); polar(theta,rho,'g') title('Polar plot of sin(2*theta).*cos(2*theta)');

subplot(2,2,1);fplot('hump',[0,1]) subplot(2,2,2);fplot('abs(exp(-j*x*(0:9))*ones(10,1))',[0 2*pi]) subplot(2,2,3);fplot('[tanh(x),sin(x),cos(x)]',2*pi*[-1 1 -1 1]) subplot(2,2,4);fplot('sin(1./x)'

%---------------------------------------------------------------------------- % exa060603.m, for example 6.6.3; % To design IIR Butteworth bandstop DF by analog-lowpass, % -------------------------

%----------------------------------------------------------------- % exa011004_sinc.m, for example 1.10.4 % to generate the sinc function. % 产生一 sinc 函数； %-----------------------

%------------------------------------------------------------------------ % exa050501.m, for example 5.5.1 and fig5.5.1 % to explain the spectra factorization %------------------------------------

%----------------------------------------------------------------------------- % exa060701_3.m , for example 6.7.1 and 6.5.1 % to test butter.m %---------------------------------------------------

%----------------------------------------------------------------------------- % exa060701_2.m , for example 6.7.1 and 6.5.1 % to test buttord,lp2lp,bilinear ; % to design Low-pass DF with s=2/Ts[(