Fft(x) different from fft(ifft(fft(x))?

1. What is the difference between FFT and IFFT?
2. How do you convert FFT to IFFT?
3. What does FFT do in MATLAB?
4. How to scale FFT in MATLAB?

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.

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 does FFT do in MATLAB?

The fft function in MATLAB® uses a fast Fourier transform algorithm to compute the Fourier transform of data. Consider a sinusoidal signal x that is a function of time t with frequency components of 15 Hz and 20 Hz. Use a time vector sampled in increments of 1/50 seconds over a period of 10 seconds.

How to scale FFT in MATLAB?

Scale by 1/sqrt(M) for the FFT, and by sqrt(M) for the IFFT.