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% Program P5_4 % Design of Analog Lowpass Filter clf; Fp = 3500;Fs = 4500; Wp = 2*pi*Fp; Ws = 2*pi*Fs; [N, Wn] = buttord(Wp, Ws, 0.5, 30,'s'); [b,a] = butter(N, Wn, 's'); wa = 0:(3*Ws)/511:3*W

% Program P5_3 % Illustration of the Aliasing Effect % in the Frequency-Domain clf; t = 0:0.005:10; xa = 2*t.*exp(-t); subplot(2,2,1) plot(t,xa);grid xlabel('Time, msec');ylabel('Amplitude');

function shili05 h0=figure('toolbar','none',... 'position',[200 150 450 250],... 'name','实例05'); t=0:pi/10:2*pi; [x,y]=meshgrid(t); subplot(2,2,1) plot(sin(t),cos(t)) axis equal sub

function shili06 h0=figure('toolbar','none',... 'position',[200 150 450 400],... 'name','实例06'); t=0:pi/10:2*pi; h=plot(t,sin(t)); xlabel('t=0到2\pi','fontsize',16); ylabel('sin(t)','fon

%Programa para comparar aproximaciones clear all close all a=1 mu=1 Io=1 k=2*pi/6 theta=pi/8 y=0 max=100 for n=1:max m(n)=n; r(n)=m(n).*a; %aproximaci髇 1 Aphi=((a^

%Programa para comparar aproximaciones clear all close all a=1 mu=1 Io=1 k=2*pi/6 theta=pi/8 y=0 max=100 for n=1:max m(n)=n; r(n)=m(n).*a; %aproximaci髇 1 Aphi=((a^

%---------------------------------------------------------------------------- % 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 %---------------------------------------------------