Interpolation of estimated frequency between fft bins what about phase?

1. What is interpolation in FFT?
2. How do you calculate frequency bins in FFT?
3. How many frequency bins are generated by the FFT?

What is interpolation in FFT?

FFT interpolation is based on adding zeros at higher frequencies of the Fourier coefficient vector. In such way, the inverse FFT will produce more output, using the same non-zero Fourier coefficients.

How do you calculate frequency bins in FFT?

FFT bins and bin width

The FFT provides amplitude and phase values for each bin. The bin width is stated in hertz. The bin width can be calculated by dividing the sample rate by the FFT length; or by dividing the bandwidth by the number of bins (which is equal to 1/2 the FFT length).

How many frequency bins are generated by the FFT?

FR = Fmax/N(Bins)

With a 1024 FFT size, we divide this band into 512 bins.