Ntau thiab ntau tus neeg siv tau pib siv cov teeb liab digitalxov tooj, tab sis nyob rau hauv ib co underdeveloped cheeb tsam analog teeb liab xov tooj yog tseem nquag siv. Ntau tus neeg siv confuse analog teeb liab nrog cov teeb liab digital. Yog li cas yog lub xov tooj analog? Lub xov tooj digital teeb liab yog dab tsi?
Analog xov tooj - Ib lub xov tooj uas xa suab los ntawm cov teeb liab analog. Hluav taws xob analog teeb liab feem ntau yog hais txog lub amplitude thiab sib txuas hluav taws xob txuas ntxiv, cov teeb liab no tuaj yeem ua analog circuit rau ntau yam haujlwm, nce, ntxiv, sib npaug thiab lwm yam. Analog signals muaj nyob txhua qhov chaw hauv qhov xwm txheej, xws li kev hloov pauv txhua hnub.
Lub teeb liab digital yog ib qho piv txwv digital ntawm lub sijhawm teeb liab (sawv cev los ntawm qhov sib lawv liag ntawm 1 thiab 0), feem ntau tau los ntawm cov teeb liab analog.
Qhov zoo thiab qhov tsis zoo ntawm cov teeb liab digital:
1, nyob ntawm qhov dav zaus band. Vim hais tias cov kab xa cov teeb liab mem tes, kis tau tus mob digitalsuab ntaub ntawvyuav tsum tau account rau 20K-64kHz bandwidth, thiab ib qho analog lub suab txoj kev tsuas yog nyob 4kHz bandwidth, uas yog, ib tug PCM teeb liab tso nyiaj rau ob peb analog suab txoj. Rau ib qho channel, nws qhov kev siv tus nqi raug txo, lossis nws cov kev xav tau rau cov kab yog nce.
2, cov kev cai yuav tsum yog complex, tshwj xeeb tshaj yog cov synchronization technology yuav tsum tau high precision. Txhawm rau kom nkag siab lub ntsiab lus ntawm tus neeg xa khoom, tus txais yuav tsum paub qhov txawv ntawm txhua qhov chaws, thiab nrhiav qhov pib ntawm txhua pawg ntaub ntawv, uas xav kom tus neeg xa ntawv thiab tus txais yuav tsum ua tib zoo saib xyuas synchronization, yog tias tsim kom muaj lub network digital, qhov teeb meem synchronization yuav yuav nyuaj dua los daws.
3, analog / digital hloov dua siab tshiab yuav coj quantization yuam kev. Nrog rau kev siv cov kev sib txuas loj loj thiab qhov nrov ntawm kev sib kis ntawm cov xov xwm xws li fiber ntau optical, ntau thiab ntau cov cim digital yog siv rau cov ntaub ntawv khaws cia thiab xa mus, yog li cov cim analog yuav tsum tau hloov mus rau analog / digital, thiab quantization yuam kev yuav inevitably. tshwm sim hauv kev hloov dua siab tshiab.
Post lub sij hawm: Feb-05-2024
