In a normal DFT, each harmonic amplitude is the result of N complex multiplies with N different complex exponentials – giving a total of N2 multiplies for all N harmonics. When N is a power of 2, many of these multiplies concern identical numerical multiplicands and many of the complex exponentials are zero or 1.
Read moreHow do you find the Fourier amplitude of a spectrum?
The Fourier amplitude spectrum FS(ω) is defined as the square root of the sum of the squares of the real and imaginary parts of F(ω) .
Read moreWhat does amplitude mean in FFT?
The frequency axis is identical to that of the two-sided power spectrum. The amplitude of the FFT is related to the number of points in the time-domain signal .
Read moreWhat is the amplitude spectrum?
amplitude spectrum specifies the amplitude of signal components as a function of component . frequency . The phase spectrum specifies the phase of signal components as a function of. component frequency. This phase is measured with respect to a cosine reference.
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