Conversion between FFT & ASD

1. How do you convert FFT to IFFT?
2. What are the two types of FFT?
3. What is the difference between FFT and Fourier transform?

How do you convert FFT to IFFT?

A quick and easy way to get an IFFT if you only have an FFT is to do conjugate -> FFT -> conjugate -> scale (optional) . Most cell phones only have 1 FFT chip, and the reason being that chip can do FFT and IFFT. To obtain the IFFT you need to do the FFT, scale the result, and shift the result.

What are the two types of FFT?

These are called the radix-2 and mixed-radix cases, respectively (and other variants such as the split-radix FFT have their own names as well).

What is the difference between FFT and Fourier transform?

The only difference between FT(Fourier Transform) and FFT is that FT considers a continuous signal while FFT takes a discrete signal as input. DFT converts a sequence (discrete signal) into its frequency constituents just like FT does for a continuous signal.