17 Dec
2003
17 Dec
'03
3:17 p.m.
However, what is somewhat less well-known is the fact that in order to keep higher frequencies from being "aliased" (reflected to lower frequencies by heterodyne processes) it is necessary to remove (by filtering) any frequency content above that maximum, before sampling is done.
Well, fudge sticks. That sounds like this thing called an "image" in heterodyne analog RF receivers. I know how those work. What is the physical basis for "aliasing" as you describe, in the sampling theater of operations?