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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

 

GDU

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