[PD] unit impulse without [dirac~]

Mathieu Bouchard matju at artengine.ca
Sun Nov 18 18:17:37 CET 2007

On Fri, 16 Nov 2007, zmoelnig at iem.at wrote:
> Quoting Andy Farnell <padawan12 at 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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