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Idaho State University

Glossary

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Filter
  • A device for use on power, signal, telephone or other wirelines, specifically designed to pass only selected frequencies and to attenuate substantially all other frequencies. There are two basic types of filters: a) active filters - Those which are active components and require the application of power for the utilization of their filtering properties. b) passive filters - Those which use passive components having properties of inductance, capacitance or resistance and which do not require the application of power for the utilization of their filtering properties. (NACSIM 5203)
  • See Front-End Security Filter and Guard.
  • n. [orig. UNIX, now also in MS-DOS] A program that processes an input data stream into an output data stream in some well-defined way, and does no I/O to anywhere else except possibly on error conditions; one designed to be used as a stage in a "pipeline" (see plumbing). Compare sponge.