Nkhani

Fyuluta yopanda pake, yomwe imadziwikanso kuti LC filter, ndi filtha yopangidwa ndi inductance, capacitance ndi resistance, yomwe imatha kusefa harmonics imodzi kapena zingapo. Kapangidwe ka filtha yogwiritsidwa ntchito kwambiri komanso yosavuta kugwiritsa ntchito ndikulumikiza inductance ndi capacitance motsatizana, zomwe zimatha kupanga njira yochepetsera impedance ya ma harmonics akuluakulu (3, 5 ndi 7); Fyuluta yokonzedwa kamodzi, fyuluta yokonzedwa kawiri ndi fyuluta yodutsa kwambiri zonse ndi fyuluta zosasunthika.
ubwino
Fyuluta yopanda kanthu ili ndi ubwino wa kapangidwe kosavuta, mtengo wotsika, kudalirika kwambiri pa ntchito komanso mtengo wotsika wa ntchito. Imagwiritsidwabe ntchito kwambiri ngati njira yowongolera yogwirizana.
kugawa magulu
Makhalidwe a fyuluta ya LC ayenera kukwaniritsa zofunikira zaukadaulo zomwe zafotokozedwa. Zofunikira zaukadaulo izi nthawi zambiri zimakhala kuchepetsa mphamvu ya ma frequency domain, kapena phase shift, kapena zonse ziwiri; Nthawi zina, zofunikira pakuyankha nthawi mu nthawi zimaperekedwa. Zosefera zosasinthika zitha kugawidwa m'magulu awiri: zosefera zokonzedwa ndi zosefera zapamwamba. Nthawi yomweyo, malinga ndi njira zosiyanasiyana zopangira, zitha kugawidwa m'mafayilo azithunzi ndi zosefera zogwirira ntchito.
Fyuluta yokonza
Fyuluta yosinthira imakhala ndi fyuluta imodzi yosinthira ndi fyuluta yosinthira kawiri, yomwe imatha kusefa ma harmonics amodzi (kukonza kamodzi) kapena awiri (kukonza kawiri). Kuchuluka kwa ma harmonics kumatchedwa ma resonant frequency a fyuluta yosinthira.
Fyuluta yodutsa kwambiri
Fyuluta yodutsa kwambiri, yomwe imadziwikanso kuti fyuluta yochepetsera ma amplitude, makamaka imaphatikizapo fyuluta yodutsa kwambiri yoyamba, fyuluta yodutsa kwambiri yachiwiri, fyuluta yodutsa kwambiri yachitatu ndi fyuluta ya mtundu wa C, zomwe zimagwiritsidwa ntchito kuchepetsa kwambiri ma harmonics otsika kuposa ma frequency enaake, omwe amatchedwa ma cut-off frequency a fyuluta yodutsa kwambiri.
Fyuluta ya magawo a chithunzi
Fyulutayi yapangidwa ndikugwiritsidwa ntchito kutengera chiphunzitso cha magawo azithunzi. Fyulutayi imapangidwa ndi magawo angapo oyambira (kapena magawo theka) ogawidwa motsatira mfundo ya kukana kofanana kwa chithunzi pa kulumikizana. Gawo loyambira likhoza kugawidwa m'magulu a K-mtundu wokhazikika ndi m-mtundu wochokera ku mtundu malinga ndi kapangidwe ka dera. Potengera fyuluta yotsika ya LC mwachitsanzo, kuchepa kwa stopband kwa gawo lokhazikika la K-mtundu wotsika wa stop-pass kumawonjezeka modabwitsa ndi kuwonjezeka kwa ma frequency; Node yotsika ya m-yochokera ku m-imakhala ndi peak yotsika pa frequency inayake mu stopband, ndipo malo a peak yotsika amalamulidwa ndi mtengo wa m mu node yochokera ku m. Pa fyuluta yotsika ya Cascaded Low-Pass basic sections, kuchepa kwa inherent kuli kofanana ndi kuchuluka kwa kuchepa kwa inherent kwa gawo lililonse loyambira. Pamene kuletsa kwamkati ndi kuletsa katundu kwa magetsi omwe atsirizidwa kumapeto onse a fyuluta kuli kofanana ndi kuletsa kwa chithunzi kumapeto onse awiri, kuchepetsa kugwira ntchito ndi kusintha kwa gawo la fyuluta kuli kofanana ndi kuchepetsa kwawo kwachilengedwe ndi kusintha kwa gawo motsatana. (a) Fyuluta yomwe yawonetsedwa ili ndi gawo lokhazikika la K ndi magawo awiri otengedwa m mu cascade. Z π ndi Z π m ndi kuletsa kwa chithunzi. (b) Kodi kuletsa kwake kumadziwika ndi kuchuluka kwa ma attenuation frequency. Malo a ma attenuation peaks awiri /f ∞ 1 ndi f ∞ 2 mu stopband amatsimikiziridwa motsatana ndi ma m values ​​a ma node awiri otengedwa m.
Mofananamo, zosefera zodulira kwambiri, zodulira za band-pass ndi zodulira za band stop zitha kupangidwanso ndi magawo oyambira ofanana.
Kuletsa kwa chithunzi cha fyuluta sikungafanane ndi kukana kwamkati kosasunthika kwa magetsi ndi kuletsa kwa katundu mu gulu lonse la ma frequency (kusiyana kwake ndikokulirapo mu gulu loyimitsa), ndipo kuchepa kwachilengedwe ndi kuchepa kwa ntchito kumasiyana kwambiri mu gulu loyimitsa. Kuti zitsimikizire kuti zizindikiro zaukadaulo zikukwaniritsidwa, nthawi zambiri ndikofunikira kusunga malire okwanira a kuchepa kwachilengedwe ndikuwonjezera m'lifupi mwa gulu loyimitsa pakapangidwe.
Fyuluta yogwiritsira ntchito
Fyuluta iyi siili ndi magawo oyambira ozunguliridwa, koma imagwiritsa ntchito ntchito za netiweki zomwe zitha kuzindikirika ndi R, l, C ndi zinthu zina zolumikizirana kuti zigwirizane molondola ndi ukadaulo wa fyuluta, kenako zimazindikira dera lofananira la fyuluta ndi ntchito za netiweki zomwe zapezeka. Malinga ndi njira zosiyanasiyana zoyerekeza, ntchito zosiyanasiyana za netiweki zitha kupezeka, ndipo mitundu yosiyanasiyana ya mafyuluta imatha kuzindikirika. (a) Ndi khalidwe la fyuluta yotsika yomwe imazindikira ndi flattest amplitude approximation (bertowitz approximation); Passband ndi yosalala kwambiri pafupi ndi zero frequency, ndipo attenuation imawonjezeka modabwitsa ikayandikira stopband. (c) Ndi khalidwe la low-pass filter yomwe imazindikira ndi equal ripple approximation (Chebyshev approximation); Attenuation mu passband imasinthasintha pakati pa zero ndi upper limit, ndipo imawonjezeka modabwitsa mu stopband. (e) Imagwiritsa ntchito elliptic function approximation kuti izindikire makhalidwe a low-pass filter, ndipo attenuation imapereka kusintha kwa voltage kosalekeza mu pass band ndi stop band. (g) Kodi khalidwe la fyuluta yotsika mtengo imawonedwa ndi; Kuchepa kwa mphamvu mu passband kumasintha mofanana ndi kukula kwake, ndipo kuchepa kwa mphamvu mu stopband kumasintha malinga ndi kukwera ndi kugwa komwe kumafunika ndi index. (b) , (d), (f) ndi (H) ndi ma circuits ofanana a fyuluta yotsika mtengo iyi motsatana.
Zosefera zodulira kwambiri, zodulira za band-pass ndi zodulira band nthawi zambiri zimachokera ku zodulira zodulira zochepa pogwiritsa ntchito kusintha kwa ma frequency.
Fyuluta yogwirira ntchito imapangidwa ndi njira yopangira molondola malinga ndi zofunikira za zizindikiro zaukadaulo, ndipo imatha kupeza dera losefera lomwe limagwira ntchito bwino komanso losawononga ndalama zambiri,
Fyuluta ya LC ndi yosavuta kupanga, yotsika mtengo, yotakata mu bandeji yama frequency, ndipo imagwiritsidwa ntchito kwambiri polumikizirana, zida ndi madera ena; Nthawi yomweyo, nthawi zambiri imagwiritsidwa ntchito ngati chitsanzo cha kapangidwe ka mitundu ina yambiri ya zosefera.

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