sine with increasing frequency
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in my opinion, the following code should produce a sine-wave that has a frequency of 2Hz at t=20. but when i count the periods between t=19 and t=20, i count more than 3 periods. what am i doing wrong?
clear all, close all, clc;
t=linspace(0,20,10000);
y=sin(2*pi*(1+(5/100)*t).*t);
plot(t,y);
hold on;
2 Comments
Image Analyst
on 5 Sep 2015
If you have the signal processing toolbox, you might also be interested in the chirp() function.
Answers (1)
Star Strider
on 5 Sep 2015
You’re multiplying by t first, then element-wise by .*t. I also don’t understand what the 1 is for.
See if this does what you want:
t=linspace(0,20,10000);
y=sin(2*pi/20.*t.^2);
3 Comments
Star Strider
on 5 Sep 2015
I still don’t understand what you want, but so long as you got your answer, we’ll consider this resolved.
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