How can I generate audio chirp signal ?

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Alex Dashevsky
Alex Dashevsky 2018-3-25
回答： Sulaymon Eshkabilov 2021-7-10
Hi, I need to find a frequency response of the system. I want to generate chirp audio sound from 200Hz to 10Khz. I can't understand how do it. Could you help ?

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回答（2 个）

Star Strider
Star Strider 2018-3-25
Try this:
t = linspace(0, 4.8, 4.8E+4);
f0 = 200;
f1 = 10000;
Fs = 1/mean(diff(t));
x = chirp(t,f0,t(end),f1);
sound(x, Fs)
figure(1)
plot(t, x)
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Star Strider
Star Strider 2019-3-29
The last element in the ‘t’ vector.
Javier
Javier 2020-11-17
How would you export it to be a .wav file?

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Sulaymon Eshkabilov
Just using audiowrite(), e.g.:
t = linspace(0, 4.8, 4.8E+4);
f0 = 200;
f1 = 10000;
Fs = round(1/mean(diff(t))); % Has to be integer and thus, it has to be rounded up!
y = chirp(t,f0,t(end),f1);
sound(y, Fs)
filename = 'Chirp_Sound.wav';
audiowrite(filename,y,Fs); % Chirp_Sound.wav file is created
clear y Fs
%% Test the recoded *.wav file
[y,Fs] = audioread(filename);
sound(y, Fs)

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