On Fri, 16 Nov 2007, zmoelnig@iem.at wrote:
Quoting Andy Farnell padawan12@obiwannabe.co.uk:
In which case Dirac impulses are theoretical and not practical digital signals?
dirac impulses are _theoretical_ _analog_ signals.
And yet, if you discretise them using Fourier theory, using sampling as a sharp cut-off frequency, with a finite block size, they become quite normal signals, with finite energy. For each block size there is a different spectrum which is just a continuation of the spectrum of any Dirac impulse with a smaller block size. I think that this is a fair enough version of Dirac in the discrete domain. (see my previous mail in this thread for more details)
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