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Module by: Erik Luther. E-mail the author

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Name: DSP Laboratory: Aliasing
ID: m13034
Language: English (en)
Summary: We will now look at aliasing and its effect on the sampled signal. As you know, aliasing exists whenever signal frequencies greater than Fs/2 are sampled using a sampling frequency of Fs. To eliminate aliasing, most sound cards and DSP boards have some sort of built-in analog anti-aliasing filter that removes all input signals greater than a certain frequency prior to sampling. It is important to remember that anti-aliasing filters must do the filtering prior to sampling – otherwise, the high-frequency signals would have already aliased to lower frequencies by the sampling process.
Subject: Science and Technology
Keywords: 6711, Digital, dsk, DSP, labview, LabVIEW DSP, lv, Processing, Signal, speedy, speedy 33, texas instruments, ti, tidsk
Document Type: -//CNX//DTD CNXML 0.5//EN
License: Creative Commons Attribution License CC-BY 2.0

Authors: Erik Luther (
Copyright Holders: Erik Luther (
Maintainers: Erik Luther (

Latest version: 1.2 (history)
First publication date: Sep 20, 2005 12:22 pm -0500
Last revision to module: Sep 20, 2005 1:22 pm -0500


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Version History

Version: 1.2 Sep 20, 2005 1:22 pm -0500 by Erik Luther
nothing changed

Version: 1.1 Sep 20, 2005 1:16 pm -0500 by Erik Luther
Translated from Word and Published

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Luther E. DSP Laboratory: Aliasing [OpenStax_CNX Web site]. September 20, 2005. Available at:

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