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 Jan12 awarded Teacher Dec25 awarded Student Dec22 comment Extracting exact frequencies from FFT output This paper, by Barry Kulp, gives a technique for using two adjacent bin values for interpolating the exact frequency: tedknowlton.com/resume/FFT_Bin_Interp.html. Hope it's of use. Dec22 awarded Editor Dec22 comment Given $\log_2 A$, is there an easy way to calculate $\log_2 (A-1)$? @Asaf - log(A-1). I fixed the question, thanks. Dec22 revised Given $\log_2 A$, is there an easy way to calculate $\log_2 (A-1)$? Fix ambiguity in equations. Dec22 asked Given $\log_2 A$, is there an easy way to calculate $\log_2 (A-1)$? Dec22 answered Can the phase of a function be extracted from only its absolute value and its Fourier transform's absolute value? Dec22 comment FFT gives ghost frequency @Commodore64 - definitely aliasing, you should make your comment an answer! Dec22 awarded Supporter Dec22 comment Could you a give a intutive interpretation of curl? Substitute "tiny waterwheel" for "small ball" in the 2nd wiki excerpt, it might be more intuitive then.