Filter may refer to:
In chemistry, engineering, or household usage, a device to separate mixtures. See:
In optics and photography, a device to remove, or to enhance, certain ranges of wavelengths (colors) of light. See:
In signal-processing applications (such as telecommunications, music, and picture processing): a mathematical algorithm, or an electrical or mechanical device, to modify the contents of signals and to extract their salient features. See:
See filtering problem (stochastic processes) for the mathematical formalism.
Coming soon: a spam ban in a can. (Berkeley Software Design BSDI Mail Filter anti-spamming software)(Product Announcement)
Mar 02, 1998; Colorado Springs Looking for a way to block up to 95% of spam you are assaulted with every day? A new antispam device coming this...
SurfControl upgrades e-mail filter software; Boosts spam detection while adding compliance features.(Brief article)
Sep 05, 2007; Byline: Cara Garretson SurfControl on Wednesday announced an upgrade to its e-mail security filter software that adds reputation...