Chirp (Swept-frequency cosine) Signal Generation
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enrique128
il 14 Mar 2021
Commentato: Star Strider
il 14 Mar 2021
Hello everyone,
I am trying to generate the chirp signal which can be also named as Swept-frequency cosine. My signal's frequency should increase with respect to triangular signal as you can see. The problem is that, I did the increasing part but I could not integrate the decreasing part to the increasing part. It should be continuous, vary with the triangular signal and this signal must be one piece. My code is written below. Thanks for your helps...
t = 0:1/10000:2;
y = chirp(t,0,1,25);
plot (t,y);
hold on
T = 10*(1/50);
fs = 10000;
t = 0:1/fs:4;
x = sawtooth(2*pi*0.25*t,1/2);
plot(t,x, 'green', 'linewidth', 3);
grid on
Expected Signal Waveform:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/549343/image.png)
My signal:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/549348/image.png)
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Star Strider
il 14 Mar 2021
Change the first plot call to:
plot (t,y, t(end)+t,fliplr(y));
If I understand correctly, that should do what you want.
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Star Strider
il 14 Mar 2021
I was thinking of something like this:
tv = t;
yv = [y fliplr(y(1:end-1))];
figure
plot(tv, yv)
yve = repmat(yv, 1, 3);
tve = linspace(0, numel(yve), numel(yve))/fs;
figure
plot(tve, yve)
grid
xlim([min(tve) max(tve)])
I only extended it to 3 times its original length here.
Experiment with it to get the result you want.
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