how can I make this nonstationary signal's dft graph?

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DOHYUN JANG
DOHYUN JANG 2019-11-15
评论： DOHYUN JANG 2019-11-22
과제4 사진.pnghow can i make such a signal graph with 5hz, 20hz, 50hz and 1000 smapling frequency?

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Prabhan Purwar
Prabhan Purwar 2019-11-21
Hi,
The following code illustrates a method to find DFT of a nonstationary signal.
a=1;
f=[5 20 50 1000];
for i=1:length(f)
t=linspace(0,0.3,2000);
y(i,:)=a*sin(2*pi*f(i)*t);
end
ynet=[y(1,:) y(2,:) y(3,:) y(4,:)];
plot(ynet);
yft=fft(ynet);
figure
L=length(yft);
f = 6.6667e+03*(0:(L/2))/L;
g=fftshift(abs(yft));
plot(f,g(4000:8000));
ft.JPG
Refer to the following link for further information:

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