Calculate ifft using only REAL forward FFT

1. How do you convert FFT to IFFT?
2. How do you calculate IFFT?
3. Can we use FFT for IDFT?
4. How do you calculate IDFT using FFT algorithm?

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.

How do you calculate IFFT?

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. If Y is a matrix, then ifft(Y) returns the inverse transform of each column of the matrix.

Can we use FFT for IDFT?

The same FFT algorithm can be adapted in many ways to compute IDFT in a faster way.

How do you calculate IDFT using FFT algorithm?

In the IDFT formula, we have two different multiplying factors. Thus if we multiply with a factor of 1/N and replace the twiddle factor with its complex conjugate in the DIF algorithm's butterfly structure, we can get the IDFT using the same method as the one we used to calculate FFT.