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How to generate a sine signal in which initially frequency increases linearly, then remains constant for some time and again decreases linearly.

Asked by Vincent Dsouza on 24 Jul 2018
Latest activity Commented on by Vincent Dsouza on 27 Jul 2018
How to generate a sine signal in which initially frequency increases linearly then remains constant for some time and again decreases linearly i.e, for 1st segment its frequency increases linearly from 0HZ – 100 HZ for t1=10 sec. Then the frequency remains constant in the 2nd segment for at 100 Hz at t2=50 sec and for the 3rd segment the frequency decreases linearly from 100Hz to 0 Hz for t3=10 sec.

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1 Answer

Answer by Pawel Jastrzebski on 24 Jul 2018
Edited by Pawel Jastrzebski on 24 Jul 2018
 Accepted Answer

Would it look like this:
% y = sine(2*pi*f*t)
t1 = linspace(0,10,500);
t2 = linspace(10,50,500);
t3 = linspace(50,60,500);
f1 = linspace(0,100,500);
f2 = repmat(100, [1 numel(t2)]);
f3 = fliplr(f1)
t = [t1 t2 t3];
f = [f1 f2 f3];
figure
subplot(2,1,1)
plot(t,2*pi*f.*t)
title('2*pi*f.*t')
xlabel('t');
ylabel('2*pi*f.*t')
subplot(2,1,2)
plot(t,sin(2*pi*f.*t));
title('sin(2*pi*f.*t)')
xlabel('t');
ylabel('sin(2*pi*f.*t)')

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