Xa sihambisa umqondiso, nokuba ngumqondiso we-optical, umbane wombane, okanye i-wireless signal, ukuba idluliselwe ngokuthe ngqo, isibonakaliso siphazamiseka ngokulula, kwaye kunzima ukufumana ulwazi oluchanekileyo ekupheleni kokufumana. Ukuze kuphuculwe ubuchule bokuchasana nokuphazamiseka kwenkqubo, inokuqondwa ngokumodareyitha umqondiso. Ukumodareyitha kunokusebenzisa ngcono amajelo, ngoko ke kunefuthe elikhulu kwindlela ezisebenza kakuhle ngayo nezithembekileyo iinkqubo zonxibelelwano.
I-engile yokumodareyitha echazwe ngezantsi yeyemiqondiso ye-analogue.
Umthwali we-sinusoidal uneeparamitha ezintathu:iamplitude, frequency, kunye nesigaba. Singakwazi ukulayisha ulwazi lwesignali elungisiweyo kungekuphela nje kwinguqu ye-amplitude ye-carrier kodwa nakwi-frequency okanye utshintsho lwesigaba somthwali. Ngexesha lokumodareyitha, ukuba i-frequency ye-carrier iyahluka kunye ne-modulation signal, ibizwa ngokuba yi-frequency modulation okanye i-frequency modulation (FM); ukuba isigaba somthwali siyahluka kunye nomqondiso wokumodareyitha, kubizwa ngokuba yi-modulation yesigaba okanye i-modulation phase (PM) Kwezi ntlobo zimbini zeenkqubo zokumodareyitha, i-amplitude yomthwali ihlala ingatshintshi, kwaye utshintsho lokuphindaphinda kunye nesigaba siboniswa njenge utshintsho lwesigaba esikhawulezileyo somthwali. Ke ngoko, i-FM kunye nokumodareyitha kwesigaba ngokudibeneyo kubhekiselwa kuko njengemodyuli ye-engile.
Umehlukophakathi kokumodareyitha kwe-engile kunye nokumodareyitha kwe-amplitude kukuba i-spectrum yesignali emodareyithiweyo ayiseyiyo inguqu yomgca ye-spectrum ye-original modulated spectrum, kodwa inguqu engahambelaniyo ye-spectrum, eya kuvelisa amacandelo amatsha amaza ahlukeneyo ukusuka kwi-spectrum shift, ngoko ikwabizwa ngokuba yi-spectrum. ukumodareyitha okungekho mgca.
FM kunye PMzisetyenziswa kakhulu kwiinkqubo zonxibelelwano. I-FM isetyenziswa kakhulu kusasazo lomculo oluthembekileyo, ukuhanjiswa kwesandi seTV, unxibelelwano ngesathelayithi, kunye neenkqubo zomnxeba weselula. Ukongeza ekusetyenzisweni ngokuthe ngqo ukusasaza, i-PM ikwasetyenziswa ngokuqhelekileyo njengenguqu yokuvelisa ngokungangqalanga imiqondiso ye-FM. Kukho ubudlelwane obusondeleyo phakathi kokumodareyitha rhoqo kunye nokuguqulwa kwesigaba.
Xa kuthelekiswa netekhnoloji ye-amplitude modulation, eyona nzuzo ibalaseleyo yokumodareyitha i-engile kukusebenza kwayo okuphezulu kokuchasana nengxolo. Nangona kunjalo, kukho iinzuzo kunye neelahleko. Iindleko zokufumana le nzuzo kukuba i-engile modulation ithatha i-bandwidth ebanzi kune-signal modulation ye-amplitude.
Oku ngasentla yinkcazo yamanqaku olwazi malunga nokumodareyitha okungaqhelekanga (i-angle modulation) yazisa i-HDV photoelectric Technology Co., Ltd. I-Shenzhen HDV photoelectric Technology Co., Ltd. ikakhulu ngumenzi weemveliso zonxibelelwano. Okwangoku, izixhobo eziveliswayo zigubungela iONU series, uthotho lwemodyuli yokubona, OLT series, kwayetransceiver series. Sinokubonelela ngeenkonzo ezilungiselelwe iimeko ezahlukeneyo. Wamkelekile ukubabonisana.
