📄 figb3.m
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%
% figb3.m - M-file for generating Figure B-3
%
n=[0:139]; % time index
x1n=1.5*sin(2*pi*100*n*0.001+0.25*pi); % sinewave
x2n=1.2*randn(1,140); % random noise
xn=x1n+x2n; % sinewave + random noise
b=[0.0305, 0 -0.0305]; % numerator of IIR filter
a=[1, -1.5695, 0.9391]; % denominator of IIR filter
yn=filter(b,a,xn); % IIR filtering
plot(n,xn,':', n,yn,'-'); % plot input and output signals
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