Getting the right frequency (using FFT)

1. How do you find the frequency of a signal using FFT?
2. How do you extract frequency from FFT?
3. How do you find the frequency vector in FFT?
4. How to extract frequency from FFT Matlab?

How do you find the frequency of a signal using FFT?

Let X = fft(x) . Both x and X have length N . Suppose X has two peaks at n0 and N-n0 . Then the sinusoid frequency is f0 = fs*n0/N Hertz.

How do you extract frequency from FFT?

We can obtain the magnitude of frequency from a set of complex numbers obtained after performing FFT i.e Fast Fourier Transform in Python. The frequency can be obtained by calculating the magnitude of the complex number. So simple ab(x) on each of those complex numbers should return the frequency.

How do you find the frequency vector in FFT?

In many examples including the documentation about fft, the one-sided frequency vector is defined as: f = Fs*(0:(L/2))/L where L=length of the FFT.

How to extract frequency from FFT Matlab?

Y = fft(y,NFFT)/Datapoints; fs=Datapoints/Length; f = fs/2*linspace(0,1,NFFT/2+1);