Complex conjugate and IFFT

1. Can I.F.F.T. be complex?
2. What is the difference between FFT and IFFT?
3. What is complex conjugate of FFT?
4. What is the use of ifft?

Can I.F.F.T. be complex?

That the ifft(fft(x)) result ends up complex might be because your ifft input of strictly real fft input wasn't kept conjugate symmetric, e.g. you messed up your ifft input by truncating or zeroing half of it or something.

What is the difference between FFT and IFFT?

FFT (Fast Fourier Transform) is able to convert a signal from the time domain to the frequency domain. IFFT (Inverse FFT) converts a signal from the frequency domain to the time domain.

What is complex conjugate of FFT?

The complex conjugate of FFT(A) results from negating the imaginary part of FFT(A). The values of the elements in the power spectrum array are proportional to the magnitude squared of each frequency component making up the time-domain signal.

What is the use of ifft?

Description. X = ifft( Y ) computes the inverse discrete Fourier transform of Y using a fast Fourier transform algorithm. X is the same size as Y . If Y is a vector, then ifft(Y) returns the inverse transform of the vector.