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center frequency wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references 2 external links toggle the table of contents center frequency 11 languages deutsch فارسی bahasa indonesia 日本語 한국어 norsk bokmål polski português svenska українська 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia channel between upper and lower cutoff frequencies of a band system the frequency axis of this symbolic diagram may be linearly or logarithmically scaled except in special cases the peak response will not align precisely with the center frequency in electrical engineering and telecommunications the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies it is usually defined as either the arithmetic mean or the geometric mean of the lower cutoff frequency and the upper cutoff frequency of a band pass system or a band stop system typically the geometric mean is used in systems based on certain transformations of lowpass filter designs where the frequency response is constructed to be symmetric on a logarithmic frequency scale 1 the geometric center frequency corresponds to a mapping of the dc response of the prototype lowpass filter which is a resonant frequency sometimes equal to the peak frequency of such systems for example as in a butterworth filter the arithmetic definition is used in more general situations such as in describing passband telecommunication systems where filters are not necessarily symmetric but are treated on a linear frequency scale for applications such as frequency division multiplexing 2 references edit john t taylor and qiuting huang 1997 crc handbook of electrical filters crc press isbn 0 8493 8951 8 julie k petersen 2003 fiber optics illustrated dictionary crc press isbn 0 8493 1349 x external links edit calculations and comparisons between the geometric mean and the arithmetic mean retrieved from https en wikipedia org w index php title center_frequency oldid 1277873522 categories electrical engineering telecommunication theory frequency domain analysis hidden categories articles with short description short description is different from wikidata this page was last edited on 27 february 2025 at 05 40 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents center frequency 11 languages add topic