Common non-rectangular window functions all seem to be symmetric. Is there ever a case when one would want to use a non-symmetric window function before an FFT? (Say if the data on one side of the FFT aperture were considered a bit more important than data on the other, or less noisy, etc.)
If so, what kinds of asymmetric window functions have been studied, and how would they affect the frequency response compared to a (more lossy?) offset symmetric window?
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