Trying to make a chirp (sweep) in matlab with random frequency

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Mauricio Galván García Luna 2017-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/353183-trying-to-make-a-chirp-sweep-in-matlab-with-random-frequency

回答： Image Analyst 2017-8-18

采纳的回答： Image Analyst

Hi guys!

I have been trying to make a chirp function in which the frequency is changing randomly through the time

my parameters are this t1=0 t2=1 f1=0 f2=60

I have tried the chirp function of matlab, however, the frequency is linearly increasing but I also want that it could decrease.

Any ideas?

Thanks in advance

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Answer 1

Image Analyst 2017-8-18

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在 MATLAB Online 中打开

It's not really a chirp if you want to have the frequencies vary more or less randomly up and down. But anyway, to make a signal with random frequencies:

t = linspace(0, 100, 400);
amplitude = 3;
% Make random frequencies.
frequency = .04 + .04 * rand(1, length(t));
% Construct waveform.
y = amplitude * cos(2 .* pi .* frequency .* t);
plot(t, y, 'b-');
grid on;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0, 1, 1]);