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FFT: relation between input data and transform length

Honored Contributor I

Hi, everyone, 


For FFT, is there any formula to compute how many input data needed for one output data coming out with respect to the transform length? 


I have simulated the situations when transform length are 64 and 1024, I observed that 169 and 2108 clock cycles (input data) are needed for one output data respectively. I don't see any connection between the transform length and data needed for on output so far.  


Thanks and best regards 


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