🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ1455881· pop 23· linked from 151 articlescutoff frequencyfrequency response boundaryAvailable in 23 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةCatalanEsperantoConnectionsoptical fiberEntitywavenumberEntityCategoriesFilter theory