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...] receiver or transmitter that works by the [[superheterodyne]] principle, and controls the [[radio frequency|frequency]] to which the apparatus is tuned. ...either the sum of the two frequencies at the mixer inputs ([[Heterodyne#Up and down converters|up-conversion]]), <math>f_{IN}+f_{LO}</math> or more common

:''This article is about the history and development of passive linear analogue filters used in electronics. For lin ...annel; the selection of a chosen [[radio station]] in a [[radio receiver]] and rejection of others.

...rap|455 kHz}}, a common [[intermediate frequency|IF]] for these receivers, and is dimensioned {{nowrap|45×15×15 mm}} ({{nowrap|{{frac|1|3|4}}×{{frac|7| ...filter there are [[transducer]]s which convert the electrical signal into, and then back from, these mechanical vibrations.

...than the original radio carrier frequency. Virtually all modern [[radio]] and [[television]] receivers use the superheterodyne principle. [[Image:Tuning capacitor.jpg|thumb|Two-section variable capacitor, used in superheterodyne

...uency mixer|frequency mixing]] (the frequency mixing process generates sum and difference frequencies) operations to produce the desired output signal. ...ilding-blocks: indirect digital ([[PLL]]) synthesizers including integer-N and fractional-N.<ref>{{Harvtxt|Egan|2000|pp=14–27}}</ref>