Article View: comp.dsp
Article #169Re: Energy within a Digitized Pulse
From: David P. Kemp
Date: Fri, 31 Jul 1992 00:20
Date: Fri, 31 Jul 1992 00:20
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In article <dak.712512304@tabaqui> dak@tabaqui.informatik.rwth-aachen.de (David Kastrup) writes:
>Usually you interpret the digital values as Dirac pulses with the appropriate
>amplitude. The energy of a single such pulse is infinite. However,
>the digitized pulses are lowpass-filtered before reproduction, thus achieving
>finite energy again. Without this filtering (even if obly in theory or
>conceptional) energy cannot be calculated.
Usually I interpret the digital values as impulse (delta) functions with the
appropriate *energy*. Delta functions are defined by their integrals, such
that integrating over a single pulse gives a finite energy. The amplitude
of an impulse is infinite, but it's duration is infinitesimal.
--
Dave Kemp dpkemp@afterlife.ncsc.mil
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Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!wupost!sdd.hp.com!uakari.primate.wisc.edu!relay!zogwarg!tecsun1!afterlife!dpkemp From: dpkemp@afterlife.ncsc.mil (David P. Kemp) Newsgroups: comp.dsp Subject: Re: Energy within a Digitized Pulse Keywords: Attenuation, Energy, :-) Message-ID: <1992Jul31.002043.16110@afterlife.ncsc.mil> Date: 31 Jul 92 00:20:43 GMT References: <15598@ucdavis.ucdavis.edu> <60983@aurs01.UUCP> <dak.712512304@tabaqui> Organization: The Great Beyond Lines: 18