How to convert a filtered time-domain signal into frequency one? I have a signal in matlab like this:



I have designed a band-pass filter in 16-32 MHz range:



and applied the filter to the signal,



the result is like this :



My Question:

what is the easiest way to convert this time-domain signal into a frequency based signal?

can I export the signal into workspace and use the data variable?
Taking the FFT will give you a frequency representation of the data:

y=fft(sig3.data);