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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 effect that can be expressed as a mathematical function or algorithm. The two primary limitations of digital filters are their speed (the filter can't operate any faster than the computer at the heart of the filter), and their cost. However as the cost of integrated circuits has continued to drop over time, digital filters have become increasingly commonplace and are now an essential element of many everyday objects such as radios, cellphones, and stereo receivers.

Source: Wikipedia (http://en.wikipedia.org/wiki/Digital_filters)


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Last updated: Wed Aug 25 2010
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Mark Twain quote for the day:

So far as I can see, a procession has value in but two ways - as a show and as a symbol, its minor function being to delight the eye, its major one to compel thought, exalt the spirit, stir the heart, and inflame the imagination. As a mere show, and meaningless - like a Mardi-Gras march - a magnificent procession is worth a long journey to see; as a symbol, the most colorless and unpicturesque procession, if it have a moving history back of it, is worth a thousand of it.
- Queen Victoria's Jubilee