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difference in authors solution and matlab solution

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moonman
moonman 2011-10-1
关闭： MATLAB Answer Bot 2021-8-20
This is question of book of signal Processing first by Yoder and Schafer
The author has drawn spectrum which is different than spectrum of matlab. why there is difference. Is author solution wrong
the author solution is here
http://www.4shared.com/photo/TtXsfCA1/question.html
and matlab code for spectrum is here
Fs = 2000;
t = 0:1/Fs:1-(1/Fs);
x = cos(80*pi*t-pi/3).*(cos(1200*pi*t+pi/4));
xdft = (1/length(x))*fft(x);
freq = -1000:(Fs/length(x)):1000-(Fs/length(x));
plot(freq,abs(fftshift(xdft)));

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moonman
moonman 2011-10-1
ok problem resolved
the author was wrong
he did not write
2*pi*f*t

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