What is the spectral analysis function?

The task: run a spectral analysis and synthesis of functions using the fast Fourier transform (FFT).
With the spectrum analyzer still clear, but with a spectral synthesis of function - no. Tell me, what is this synthesis, and what is its result? As the clause specified that if you do a reverse FFT, you need to consider 1, 2, 4, 8 ,16 and 128 values obtained using the direct FFT. What it means to take these values into account?
April 4th 20 at 13:27
1 answer
April 4th 20 at 13:29
Read the documentation for MATLAB:
Spectral analysis: https://docs.exponenta.ru/signal/ug/spectral-analy...
FFT for spectral analysis: https://docs.exponenta.ru/matlab/math/fft-for-spec...

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