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**posix_memalign** Thank you for your reply however that is the whole question from an exam; and I'm still struggling with it.

The only context is that it is related to "sampling and reconstruction" and "antialiasing" (just some lecture topics), there is no other context to give; the exam is also from a course in computer graphics and is not very mathematical oriented (although it is to some degree, it is just not purely mathematical) -- I think this question is supposed to be a bit trivial, although it isn't trivial to me, what am I missing?

The second question is:

"The spectrum of the sinc function (in time domain) is the box function (in frequency domain).", i.e. is this true or false? I'm told it is true, but I can't see why.