Why is my DFT/FFT always 90° out of phase?

1. Does FFT give phase?
2. How many phases are there in FFT?
3. Why is FFT output mirrored?
4. What is FFT phase spectrum?

Does FFT give phase?

The output of the FFT is a complex vector containing information about the frequency content of the signal. The magnitude tells you the strength of the frequency components relative to other components. The phase tells you how all the frequency components align in time.

How many phases are there in FFT?

FFT consists of five major components: engagement, motivation, relational assessment, behavior change and generalization.

Why is FFT output mirrored?

Because both the positive and negative frequency sinusoids are 90 degrees out of phase and have the same magnitude, they will both respond to real signals in the same way.

What is FFT phase spectrum?

The FFT function computes the complex DFT and the hence the results in a sequence of complex numbers of form . The amplitude spectrum is obtained. For obtaining a double-sided plot, the ordered frequency axis (result of fftshift) is computed based on the sampling frequency and the amplitude spectrum is plotted.