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Chirp (Swept-frequency cosine) Signal Generation

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enrique128
enrique128 2021-3-14
评论： Star Strider 2021-3-14
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:
My signal:

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Star Strider
Star Strider 2021-3-14
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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enrique128
enrique128 2021-3-14
编辑：enrique128 2021-3-14
Sir all I want to do is make this signal periodic. It says
Error using plot
Vectors must be the same length.
Error in Untitled2 (line 9)
plot (tv,y, t(end)+t,fliplr(y));
Star Strider
Star Strider 2021-3-14
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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