Article View: comp.dsp
Article #143Re: Energy within a Digitized Pulse
From: Chia-Liang Liu
Date: Sat, 25 Jul 1992 19:47
Date: Sat, 25 Jul 1992 19:47
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1532 bytes
In article <uJVgoB1w164w@gmp.lonestar.org> greg@gmp.lonestar.org (G.R. Basile) writes: > >Isn't this only an approximation? For a countinuous signal the power is >evaluated as the Integral of the function over a given period divided by >the period. Isn't the above algorithm akin to evaulating the integration >with Riemann sums. Simpson's rule could be used to increase the accuracy. >I would think that the error gets significant as the the frequency of >the function approaches half the sampling frequency. >What would be an exact solution ? > Yes and No! If you try to evaluate the energy of the original continuous signal, you either use Simpson's rule or over-sample the signal to increase the accuracy. However if you are talking about the energy of a sampled_and_hold signal, sum and multiply by Ts is what you want. -- Ka-Leung Lau ( Chia-Liang Liu ) Digital Communications Research Laboratory Department of Electrical and Computer Engineering University of California, Davis (Cal Aggies)
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Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!ucbvax!ucdavis!madrone.eecs.ucdavis.edu!liuc From: liuc@madrone.eecs.ucdavis.edu (Chia-Liang Liu) Newsgroups: comp.dsp Subject: Re: Energy within a Digitized Pulse Keywords: Attenuation, Energy Message-ID: <15498@ucdavis.ucdavis.edu> Date: 25 Jul 92 19:47:49 GMT References: <15458@ucdavis.ucdavis.edu> <uJVgoB1w164w@gmp.lonestar.org> Sender: usenet@ucdavis.ucdavis.edu Organization: U.C. Davis - Department of Electrical and Computer Engineering Lines: 22