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Aliases
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This simple model is designed to help with revision of the idea of an alias.
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Two cases are included with the model which is showing a 50 Hz cosine signal. Using the cases buttons and the adjust button on the graph window, you can display each graph separately and superimposed if both buttons are selected.
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The graphs are produced at different time intervals DT and this can be selected in the model.
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Use the model and the edit copy window function to explain what an alias is. Select a DT at the Nyquist limit and produce the graph for this case. Discuss what you see in this case. Try a slightly smaller time interval than the Nyquist suggestion. Does this help a lot with the faithful representation of the signal?
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Download this Resource
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Package:
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Aliases.exe (96Kb)
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Contents:
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Aliases.mdl and Aliases.doc
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Instructions:
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Download the self extracting ZIP archive. Locate the file using Windows Explorer and double click. The self extractor will then start. The default installation path is C:\AP Revision. Having set the path press the Unzip button. After the files have been extracted change directory to C:\AP Revision. To start the model double click on Aliases.mdl.
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