FFT Spectrum demonstrates the frequency content of the signal at a certain point in time.
The spectrum exists as the basic measurement of an FFT analyzer. It is simply the complex FFT. Normally, the magnitude of the spectrum stands displayed. The magnitude stands as 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.)
The output of the FFT stands for a complex vector containing information about the frequency content of the signal. The magnitude tells you the strength of the frequency components compared to other components. The grade tells you how all the frequency components align in time.
Hence, FFT Spectrum demonstrates the frequency content of the signal at a certain point in time.
To learn more about FFT Spectrum refer to:
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