difference in authors solution and matlab solution

2011 10 1
1 个回答
更新时间：2021 8 20
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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)));

回答（1 个）

moonman
moonman 2011-10-1

0 个投票

ok problem resolved
the author was wrong
he did not write
2*pi*f*t

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moonman
moonman
2011-10-1

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