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发帖数: 6 | 1 Yes! It's really a problem to measure the accurate amplitude
of a SIN signal if the sampling window is not exactly
the mutiple of period of the SIN,because FFT is just a
sample of FT.to solve the problem,one of the effective way
is to get N sets of the samples,say,A,B,C....,then average
the power of these samples.
Equation:((abs(FFT(A))^2+(abs(FFT(B))^2+...)/N
and of course another way,increase the sampling frequency
as high as possible. |
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