phase = angle(fft(x)) * 180/pi ; figure; subplot(311); plot(x); subplot(312); plot(y);
Read moreWhat is FFT phase?
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 .
Read moreDoes FFT have a phase?
FFT result bins within a rounding error of zero often have random phases . Whereas the angle of a non-zero length vector actually points somewhere. Note that a cosine and a sine of the same frequency are orthogonal. A ratio of the two (cosine and sine) is required to represent any sinusoid of that same frequency.11 May 2017
Read moreWhat is frequency resolution of DFT?
The frequency resolution is just the sample frequency divided by the number of samples (which is also the number of steps in the DFT sine table). If we have a sample rate of 10240 Hz for our 1024 samples, for instance, we will get 10 Hz resolution.
Read moreHow do you determine the frequency resolution of the discrete amplitude spectrum?
For the DFT, the resolution is equal to f s/N , from Equation 4.8. So, for a given sampling frequency, the more samples (N) in the signal, the smaller the frequency increment between successive DFT data points. The more points sampled, the higher the spectral resolution.
Read moreWhat is FFT frequency spectrum?
The spectrum is the basic measurement of an FFT analyzer . It is simply the complex FFT. Normally, the magnitude of the spectrum is displayed. The magnitude is the square root of the FFT times its complex conjugate. (Square root of the sum of the real (sine) part squared and the imaginary (cosine) part squared.)
Read moreHow do you find the frequency resolution of FFT?
The frequency resolution of each spectral line is equal to the Sampling Rate divided by the FFT size . For instance, if the FFT size is 1024 and the Sampling Rate is 8192, the resolution of each spectral line will be: 8192 / 1024 = 8 Hz.
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