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How ChnFFTLengthCalc works?

Can somebody please tell me how ChnFFTLengthCalc works.


I have data of undefined length i have to calculate FFT on it by taking appropriate no of windows & sections & overlap


how FFT uses total length, window size and overlap to calculate no of sections or if no of sections is known how to calculate window size


i have tried with

 = TotalLength / Window Size + Total Length x Overlap% / Window Size


but its not matching with how diadem calculates


Thanks in advance



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