ezkcdude;130954 Wrote: > They can be shifted to a higher frequency range, so that a more "gentle" > reconstruction (anti-aliasing) filter can be used. That is my > understanding.Your understanding is wrong I'm afraid. Once the alias is in > the signal, it looks just like part of the original signal so if you remove it you'll remove part of the original signal too. I think you're probably confusing 'aliasing' with 'repeat spectra'.
A good example of aliasing is that of waggon wheels in western movies appearing to speed up in a forward direction before slowing down and reversing as the waggon builds up speed. This is an example of temporal aliasing caused by the frame rate (temporal sampling frequency) of the film being too slow to capture the speed of movement. Once it's there, no amount of unsampling will remove it; the best you can do is to remove all the temporal high frequencies, in which case you'll end up with a very smeary picture :-( -- Patrick Dixon www.at-tunes.co.uk ------------------------------------------------------------------------ Patrick Dixon's Profile: http://forums.slimdevices.com/member.php?userid=90 View this thread: http://forums.slimdevices.com/showthread.php?t=26685 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
