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Article #151Re: Energy within a Digitized Pulse
From: Chia-Liang Liu Ka -Leung Lau
Date: Wed, 29 Jul 1992 03:43
Date: Wed, 29 Jul 1992 03:43
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1614 bytes
In article <TeNmoB1w164w@gmp.lonestar.org> greg@gmp.lonestar.org (G.R. Basile) writes: > >I agree. What has piqued my curiousity is how to derive an exact solution >of the power of the continuous time signal from the sampled data. What about >taking an fft of the samples and than summing the square of the magnitudes ? >What errors are introduced? > >Greg Basile >greg@gmp.lonestar.org > The information provided by a digitized signal and its FFT is identical. Since you can not calculate the energy of a signal from its samples EXACTLY, you can't calculate it from its FFT either. If you are not satisfied with the approximation, the best way is to LPF the digitized signal and measure the analog power assuming you sample the signal above the Nyquist rate and the filter doesn't cause distortion, attenuation, ..... etc. -- 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 Ka -Leung Lau) Newsgroups: comp.dsp Subject: Re: Energy within a Digitized Pulse Keywords: Attenuation, Energy Message-ID: <15598@ucdavis.ucdavis.edu> Date: 29 Jul 92 03:43:27 GMT References: <15498@ucdavis.ucdavis.edu> <TeNmoB1w164w@gmp.lonestar.org> Sender: usenet@ucdavis.ucdavis.edu Organization: U.C. Davis - Department of Electrical and Computer Engineering Lines: 24