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overview
 Digital Filters @ Wikipedia
In electronics, a digital filter is any electronic filter that works by performing digital mathematical operations on an intermediate form of a signal.
This is in contrast to older analog filters which work entirely in the analog realm and must rely on physical networks of electronic components (such as resistors, capacitors, transistors, etc.) to achieve the desired filtering effect.
Digital filters can achieve virtually any filtering...
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http://en.wikipedia.org/wiki/Digital_filter
9/4/2007
Tags: filters
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