tuned filter
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Tuned filter — In signal processing, a tuned filter is a stage in the processing channel which accepts or rejects signals which are tuned for a specific type. HistoryHistorically, the concept of tuning was to maintain a specific musical scale. When choruses… … Wikipedia
Tuned radio frequency receiver — A tuned radio frequency receiver (TRF receiver) is a radio receiver that is usually composed of several tuned radio frequency amplifiers followed by circuits to detect and amplify the audio signal. A 3 stage TRF receiver includes a RF stage, a… … Wikipedia
Filter (optics) — Coloured and Neutral Density filters Optical filters are devices which selectively transmit light of different wavelengths, usually implemented as plane glass or plastic devices in the optical path which are either dyed in the mass or have… … Wikipedia
Filter fluorometer — A filter fluorometer is a type of fluorometer that may be employed in fluorescence spectroscopy.FiltersThere are two filters for the fluorometer: #The primary filter or excitation filter or incident light filter isolates the wavelength that will… … Wikipedia
Electronic filter — Electronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones. Electronic filters can be:*passive or active *analog or digital *discrete … Wikipedia
Mechanical filter — Figure 1. A mechanical filter made by the Kokusai Electric Company intended for selecting the narrow 2 kHz bandwidth signals in SSB radio receivers. It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45×15×15 mm ( … Wikipedia
Yttrium iron garnet filter — (YIG filter) is a magnetically tunable filter for microwave frequencies. YIG spheres are used for their high Q factors.YIG filters use a synthetic single crystal yttrium iron garnet sphere acting as a resonator, providing a high Q factors. The… … Wikipedia
Distributed element filter — Figure 1. A circuit featuring many of the f … Wikipedia
Atomic line filter — A potassium Faraday filter designed, built and photographed by Jonas Hedin for making daytime LIDAR measurements at Arecibo Observatory.[1] An atomic line filter (ALF) is an advanced optical band pass filter used in the physical sciences for… … Wikipedia
Dichroic filter — Dichroic filters A dichroic filter, thin film filter, or interference filter is a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors. By comparison, dichroic mirrors and dichroic… … Wikipedia
Crystal filter — A crystal filter is a special form of quartz crystal used in electronics systems, in particular communications devices. It provides a very precisely defined centre frequency and very steep bandpass characteristics, that is a very high Q factor… … Wikipedia
