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- 1$\begingroup$ the answer to Q1 is that there is a circular nature to the DFT and that a real sinusoid at, say 9 kHz, has both a positive and negative frequency components at $\pm$9 kHz. some of that at 9 kHz is leaking from -9 kHz, which due to the nature of the DFT is at some positive-indexed bin above N/2 . $\endgroup$robert bristow-johnson– robert bristow-johnson2017-02-27 21:30:41 +00:00Commented Feb 27, 2017 at 21:30
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