(1) Qhov chaw coding thiab decoding
Ob lub luag haujlwm tseem ceeb: ib qho yog txhawm rau txhim kho kev ua tau zoo ntawm cov ntaub ntawv xa mus, uas yog, los ntawm qee yam kev siv tshuab compression coding los sim txo tus lej cim kom txo cov cim tus nqi. Qhov thib ob yog ua kom tiav qhov kev hloov pauv ntawm analog / digital (A / D), uas yog, thaum cov ntaub ntawv muab cov teeb liab analog, lub hauv paus encoder hloov nws mus rau hauv cov teeb liab digital kom ua tiav cov kev xa tawm digital ntawm cov teeb liab analog.
(2) Channel coding thiab decoding
Muaj nuj nqi: yuam kev tswj. Cov teeb liab digital yuav raug cuam tshuam los ntawm lub suab nrov thiab lwm yam tsis raug hauv cov txheej txheem sib kis. Txhawm rau txo qhov yuam kev, cov channel encoder thiab cov ntaub ntawv xa mus ntxiv cov khoom tiv thaiv (cov ntsiab lus saib xyuas) raws li qee txoj cai los tsim lub npe hu ua "anti-interference coding". Cov channel decoder ntawm qhov kawg tau txais kev txiav txim siab raws li cov kev cai sib txawv los nrhiav lossis kho qhov tsis raug thiab txhim kho kev ntseeg siab ntawm kev sib txuas lus.
(3) Encryption thiab decryption
Txhawm rau kom muaj kev ruaj ntseg ntawm cov ntaub ntawv xa mus, cov kab ke digital yog cuam tshuam los ntawm kev sib kis, uas yog, tus password ntxiv, txheej txheem no hu ua encryption. Restoring tus thawj cov lus yog decryption.
(4) Digital modulation thiab demodulation
Cov kev hloov pauv digital: Cov zaus spectrum ntawm cov teeb liab digital baseband tau txav mus rau qhov siab zaus los ua ib qho kev sib txuas lus band tsim nyog rau kev sib kis hauv cov channel. Thaum kawg tau txais, cov teeb liab digital baseband tuaj yeem rov qab los ntawm coherent demodulation lossis non-coherent demodulation.
(5) Synchronization
Synchronization: Nws yog khaws cov teeb liab ntawm ob qho kawg ntawm kev txais thiab tau txais cov kauj ruam nrog ib leeg nyob rau hauv lub sij hawm, thiab nws yog ib qho tsim nyog yuav tsum tau ua kom muaj kev sib haum xeeb, raug thiab txhim khu kev qha ntawm cov kev sib txuas lus digital.
Nov yog Shenzhen HDV phoelectron Technology Ltd. los coj koj txog "kev sib txuas lus qauv qauv" tsab xov xwm, vam tias yuav pab tau koj, Shenzhen HDV phoelectron Technology Ltd.ONUseries, transceiver series,OLTseries, tab sis kuj tsim cov module series, xws li: Kev sib txuas lus optical module, optical kev sib txuas lus module, network optical module, kev sib txuas lus kho qhov muag module, optical fiber module, Ethernet optical fiber module, thiab lwm yam., tuaj yeem muab cov kev pabcuam zoo rau cov neeg siv sib txawv. ' xav tau, txais tos koj tuaj xyuas.