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low-pass filter

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low-pass filter   (lō'pās')
n.  A filter designed to transmit electromagnetic frequencies below a certain value, while excluding those of a higher frequency.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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low-pass filter

noun
a filter that passes frequencies below a certain value and attenuates frequencies above that value 
WordNet® 3.0, © 2006 by Princeton University.
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