Changing the frequency of a signal using Matlab

Question

I want to change the frequency of a given oscillatory signal y(t) using Matlab.

---

Let's consider a sine signal as an example:

h = 0.01;         %step width
t = 0:h:2*pi;
y = sin(2*pi*t);

This generates a sine signal with a frequency of 1 Hz , assuming t is measured in seconds.

Is it possible to change the frequency of the signal y(t) to an arbitrary frequency of x Hz without using y = sin(2*pi*x*t) (as the actual signal I want to change the frequency of isn't given analytically)?

---

What I actually want to do is comparing the signal form of signals with different frequencies by changing their frequency to a common one and overlay them. It is important that the different signals can be evaluated at the same time points.

Answer 1

Looks like you want to perform frequency shifting. This topic is very old and you can find discussion in many places. Eg https://www.dsprelated.com/showthread/comp.dsp/9996-1.php