The Filter reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Filter

The term filter may refer to:

• Filter (chemistry) — a device to separate mixtures
• Filter (mathematics) — a subset of a partially ordered set
• Filter program — in Unix, any program with standard I/O streams.
• Any software that processes a data stream (e.g. mail filter, printer filter)
• Filter (signal processing) — a device or algorithm for signal processing (e.g. audio filter)
• Filter (optics) and Filter (photography) (e.g. Infrared filter, ND filter, UV filter) — a device that blocks certain wavelength ranges of light
• Filter (band) — a 1990s industrial rock band

See also

• Glossary of filter terms

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