rectangular filter
1Photographic filter — Four photographic filters. Clockwise, from top left, an infrared hot mirror filter, a polarising filter, and a UV filter. The larger filter is a polariser for Cokin style filter mounts. In photography and videography, a filter is a camera… …
2Sinc filter — In signal processing, a sinc filter is an idealized filter that removes all frequency components above a given bandwidth, leaves the low frequencies alone, and has linear phase. The filter s impulse response is a sinc function in the time domain …
3Distributed element filter — Figure 1. A circuit featuring many of the f …
4Low-pass filter — A low pass filter is a filter that passes low frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter …
5Air filter — An air filter is a device which removes solid particulates such as dust, pollen, mold, and bacteria from air. Air filters are used in applications where air quality is important, notably in building ventilation systems and in engines, such as… …
6Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… …
7Equivalent rectangular bandwidth — The equivalent rectangular bandwidth or ERB is a measure used in psychoacoustics, which gives an approximation to the bandwidths of the filters in human hearing, using the unrealistic but convenient simplification of modeling the filters as… …
8Raised-cosine filter — The raised cosine filter is a particular electronic filter, frequently used for pulse shaping in digital modulation due to its ability to minimise intersymbol interference (ISI). Its name stems from the fact that the non zero portion of the… …
9Window function — For the term used in SQL statements, see Window function (SQL) In signal processing, a window function (also known as an apodization function or tapering function[1]) is a mathematical function that is zero valued outside of some chosen interval …
10Quadrature amplitude modulation — (QAM) (Pronounced IPA|kwa:m) is a modulation scheme which conveys data by changing ( modulating ) the amplitude of two carrier waves. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature… …
