# How to differentiate between two sets of data; one being a mixture of sinusoidal waves and other without any pattern

I have two sets of data; one is a mixture of different sinusoidal waves of different frequencies and amplitude while the other set does not have any regular pattern. I have the following questions:

1. How can one differentiate between these two sets of data in real time?
2. Can Fourier transform be used? If yes, how?
3. How effective are these methods to differentiate if there is noise in data?