Isignali Digital - izinga, ukuthembeka, ukuphepha

Modern Imininingwane izwe ithuthuka ngokushesha kakhulu, ngakho mina nje kudingeka uzame ukuba uhlale kuze kube yimanje ne ubuchwepheshe obusha. Lokhu kuzokuvumela ukuba asabele yezinguquko futhi sithole izinsizakalo esezingeni lomhlaba.

Ngoba umuntu ozihambela emigwaqeni ubunjalo kusiginali yedijithali noma analog - into ungakujabulisi. Kodwa uma kukhona umbuzo mayelana nomehluko phakathi ifomethi digital futhi analog noma amasignali, sebeqala ukuba baphakamise imibuzo. Akuyona imfihlo ukuthi ubuchwepheshe zakhelwe kumigomo analog, manje noma ngokuhamba kwesikhathi, kuzophela khona kanye ngokugcwele ukunikeza izintambo ukudluliselwa kolwazi "sibalo".

Kodwa kuze kube yilo mzuzu asikafiki, ngezikhathi ezithile kunesidingo ukuguqula isiginali ye-analog kuya yedijithali. Libuye akukhona okungavamile ukuba likhithike, lapho kubalulekile ukwenza sedijithali analog isignali ukuguqulwa.

Isignali ye-analog enkabeni yalo - lena ekusakazeni ekhethekile isignali idatha, okungase esachazwa ezithile imisebenzi eqhubekayo mayelana nesikhathi. Lokhu kusho ukuthi amplitude oscillation kungaba yiliphi inani e maxima ezithile.

isignali Digital - ukusakaza ekhethekile isignali idatha, okungase esachazwa imisebenzi ethile ngokuqhubekayo mayelana nesikhathi. Lokho, ukuphakama kwawo namandla awo kwaso kungamane nje ukuthatha value kahle ichazwe.

Ukuze uthole isignali analog libhekene inqwaba ukuphazamiseka ezahlukene. Isignali digital inesimiso ewusizo ukuhlunga iningi ukuphazamiseka okungaba khona. Lokhu kufezwa ngokusebenzisa ikhono alulame yonke idatha yoqobo. Futhi, kusiginali yedijithali ihlukanisa yokungabibikho kolwazi komsebenzi ekusakazeni idatha, kuyilapho i-analogo ukudluliswa isici abangenalo esibalulekile semantic Imininingwane umthwalo. Ngo isiteshi esisodwa ngokomzimba bangadlulisela amasignali amaningi digital, kuyilapho analog eyodwa kuphela.

Isignali digital has esinye futhi isici esibalulekile - kuba ukuphepha kwakhe. Ngakho, isiginali ye-analog kukhonjelwe cishe noma iliphi ithonya noma ukuhlasela kwebutho elivela imvelo. Ngesikhathi esifanayo, it has ikhono ukuba sayinwe ziyabethelwa ukwabela ke ikhodi ekhethekile kusukela iqoqo pulses. Lokhu kungabi sengxenyeni cishe noma yikuphi ukuphazamiseka nabantu abangenalo leli lungelo, e inqubo ukudluliswa kwedatha. Ububi kuphela "izinombolo" - lena yinkimbinkimbi ukudluliswa olude. Kodwa le nkinga kalula ixazululwe ngokuthi ukusetshenziswa kwamadivaysi ekhethekile Ukushintshashintsha / demodulation imisebenzi.

Inguquko kuya kusiginali yedijithali ukhathazeke kakhulu nabasebenzisi ithelevishini. Kubantu abaningi, i-TV kwaba kanye uhlala umthombo ematheni ulwazi. Ngezinye ubuchwepheshe obufanayo ephelelwe yisikhathi alamukeli "sibalo". Ngakho-ke kudingekile ukusebenzisa isignali idivayisi ekhethekile -preobrazovatel digital.

Ingakusiza ukuguqula neyodwa isignali digital ibe analog oyifunayo. Lokhu ugwema izindleko ezengeziwe for ukuthengwa isethi entsha TV futhi ivumela ukusetshenziswa izinga idatha digital kudivayisi yakho analog.