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Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Crystal_filter> ?p ?o }

• Crystal_filter abstract "A crystal filter is an electronic filter that uses quartz crystals for resonators. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits. (see mechanical filter) In particular, quartz crystals can exhibit mechanical resonances with a very high Q factor (from 10,000 to 100,000 and greater — far higher than conventional resonators built from inductors and capacitors). The crystal's stability and its high Q factor allow crystal filters to have precise center frequencies and steep band-pass characteristics. Typical crystal filter attenuation in the band-pass is approximately 2-3dB. Crystal filters are commonly used in communication devices such as radio receivers.A crystal filter is very often found in the intermediate frequency (IF) stages of high-quality radio receivers. Cheaper sets may use ceramic filters built from ceramic resonators (which also exploit the piezoelectric effect), or tuned LC circuits. The use of a fixed IF stage frequency allows a crystal filter to be used because it has a very precise fixed frequency. Very high quality IF filters, called crystal ladder filters, can be constructed by using serial arrays of crystals.The most common use of crystal filters are at frequencies of 9 MHz or 10.7 MHz to provide selectivity in communications receivers, or at higher frequencies as a roofing filter in receivers using up-conversion. The cut of the quartz crystal determines the crystal's vibrating frequencies, such as the common AT cut used for crystal filters designed for radio communications. The cut of the quartz also determines certain temperature characteristics of the component, of which quartz has a very high temperature stability.Ceramic filters tend to be used at 10.7 MHz to provide selectivity in broadcast FM receivers, or at a lower frequency (455 kHz) as the second intermediate frequency filters in a communication receiver. Ceramic filters at 455 kHz can achieve similar bandwidths to crystal filters at 10.7 MHz.The design concept for utilizing quartz crystals as a filtering component was first established by Walter Cady in 1922, but it was largely Walter Mason's work in the late 1920s and early 1930s that devised methods for incorporating crystals into LC lattice filter networks which set the groundwork for much of the progress in telephone communications. Crystal filter designs from the 1960s allowed for true Chebyshev, Butterworth, and other typical filter characteristics. Crystal filter design continued to improve in the 1970s and 1980s with the development of multi-pole monolithic filters, widely used today to provide IF selectivity in communication receivers. Crystal filters can be found today in radio communications, telecommunications, signal generation, and GPS devices.".
• Crystal_filter thumbnail Crystal_ladder.svg?width=300.
• Crystal_filter wikiPageID "234088".
• Crystal_filter wikiPageLength "4054".
• Crystal_filter wikiPageOutDegree "30".
• Crystal_filter wikiPageRevisionID "586627812".
• Crystal_filter wikiPageWikiLink Band-pass_filter.
• Crystal_filter wikiPageWikiLink Butterworth_filter.
• Crystal_filter wikiPageWikiLink Category:Linear_filters.
• Crystal_filter wikiPageWikiLink Category:Signal_processing_filter.
• Crystal_filter wikiPageWikiLink Category:Wireless_tuning_and_filtering.
• Crystal_filter wikiPageWikiLink Ceramic_resonator.
• Crystal_filter wikiPageWikiLink Chebyshev_filter.
• Crystal_filter wikiPageWikiLink Crystal.
• Crystal_filter wikiPageWikiLink Crystal_oscillator.
• Crystal_filter wikiPageWikiLink Decibel.
• Crystal_filter wikiPageWikiLink Electronic_filter.
• Crystal_filter wikiPageWikiLink Global_Positioning_System.
• Crystal_filter wikiPageWikiLink LC_circuit.
• Crystal_filter wikiPageWikiLink Mechanical_filter.
• Crystal_filter wikiPageWikiLink Piezoelectricity.
• Crystal_filter wikiPageWikiLink Q_factor.
• Crystal_filter wikiPageWikiLink Quartz.
• Crystal_filter wikiPageWikiLink Radio.
• Crystal_filter wikiPageWikiLink Radio_receiver.
• Crystal_filter wikiPageWikiLink Roofing_filter.
• Crystal_filter wikiPageWikiLink Selectivity_(electronic).
• Crystal_filter wikiPageWikiLink Signal_generator.
• Crystal_filter wikiPageWikiLink Superheterodyne_receiver.
• Crystal_filter wikiPageWikiLink Telecommunication.
• Crystal_filter wikiPageWikiLink Walter_Guyton_Cady.
• Crystal_filter wikiPageWikiLink File:Crystal_ladder.svg.
• Crystal_filter wikiPageWikiLinkText "Crystal filter".
• Crystal_filter wikiPageWikiLinkText "crystal filter".
• Crystal_filter wikiPageUsesTemplate Template:Refimprove.
• Crystal_filter wikiPageUsesTemplate Template:Reflist.
• Crystal_filter subject Category:Linear_filters.
• Crystal_filter subject Category:Signal_processing_filter.
• Crystal_filter subject Category:Wireless_tuning_and_filtering.
• Crystal_filter hypernym Filter.
• Crystal_filter type Software.
• Crystal_filter type Filter.
• Crystal_filter comment "A crystal filter is an electronic filter that uses quartz crystals for resonators. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits. (see mechanical filter) In particular, quartz crystals can exhibit mechanical resonances with a very high Q factor (from 10,000 to 100,000 and greater — far higher than conventional resonators built from inductors and capacitors).".
• Crystal_filter label "Crystal filter".
• Crystal_filter sameAs Q1282714.
• Crystal_filter sameAs Quarzfilter.
• Crystal_filter sameAs m.01j02t.
• Crystal_filter sameAs Kristallfilter.
• Crystal_filter sameAs Q1282714.
• Crystal_filter wasDerivedFrom Crystal_filter?oldid=586627812.
• Crystal_filter depiction Crystal_ladder.svg.
• Crystal_filter isPrimaryTopicOf Crystal_filter.