Calculate average mean FFT Magnitude in bins [duplicate]

1. How do you calculate frequency bins in FFT?
2. What does magnitude of FFT tell you?
3. How do you calculate frequency bins?

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).

What does magnitude of FFT tell you?

The output of the FFT is a complex vector containing information about the frequency content of the signal. The magnitude tells you the strength of the frequency components relative to other components. The phase tells you how all the frequency components align in time.

How do you calculate frequency bins?

FR = Fmax/N(Bins)

For a 44100 sampling rate, we have a 22050 Hz band. With a 1024 FFT size, we divide this band into 512 bins. FR = 22050/1024 ≃ 21,53 Hz. Basically, the FFT size can be defined independently from the window size.