How to properly do complex Fourier transform in python?

Question

Python

I have two arrays of 1024 values ​​from two ADCs (I and Q signals). I need to calculate both the signal frequency and the phase shift between these channels. Those. do a complex transformation. It should look something like this picture:

I'm going to use NumPy. But I can’t understand how I need to prepare arrays for complex FFT and which specific function from the library should I use for my case?

Answer 1

Use numpy.fft.fft().
Can be used with real numbers, the conversion will still be complex.
If you really want everything to be complex - just add the zero imaginary part to your real numbers. This can be done for example by adding your real array with 0j.